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Choanotaenia atopa (Cestoda: Dilepididae) is described (host: domestic cat from the vicinity of Manhattan, Kansas); its natural host is presumed to be a rodent. Choanotaenia atopa is morphologically similar to cestodes of 6 species, all from rodents, formerly placed in the genus Rodentotaenia Matevosian, 1953, and subsequently removed to the genera Choanotaenia Railliet, 1986, or Monopylidium Fuhrmann, 1899. The systematic position of those cestodes is discussed; Monopylidium and Rodentotaenia are treated as synonyms of Choanotaenia. Choanotaenia atopa is distinguished by size and form of rostellar hooks, regularly alternating genital pores, and other characters in genital organs.

Four species of adult cestodes and one larval form were recovered from Rattus assimilis (Gould, 1858) from Queensland. Hymenolepis diminuta Rudolphi, 1819; and the cysticercus of Taenia taeniae-formis (Batsch, 1786) are new host records for Australia; the same infestations with Raillietina (Raillietina) celebensis (Janicki, 1902) have also been recorded by Baer and Sandars (1956). Two new species, viz:—Choanotaenia ratticola and Hymenolepis australiensis are described.The type specimens are lodged in the Queensland Museum, Brisbane. Cotype and other specimens studied are also lodged in the Queensland Museum and in the Institut de Zoologie, Université de Neuchâtel, Switzerland; the Department of Parasitology, London School of Hygiene and Tropical Medicine and in the British Museum (Natural History).

L'auteur expose les resultats de l'etude experimentale du cycle biologique de deux especes de Choanotaenia parasites des Soricidae: Ch. crassiscolex (von Linstow, 1890) et Ch. estavarensis Euzet et Jourdane, 1968, parasites respectivement des Musaraignes du genre Sorex et de la Musaraigne aquatique Neomys fodiens. Les differents stades du developpement larvaire sont decrits. Une difference de l'ordre de 10 jours dans la duree de l'evolution des deux especes est mise en evidence pour une temperature d'experience de 22° centigrades.

1. Four stages in the development of Choanotaenia crassiscolex are described with the help of five text figures and one plate.2. The functional anatomy of the cysticercoid is given with the help of diagrams.3. The identification is based on comparisons with material at the British Museum of Natural History, South Kensington, London, and comparison is made with earlier records in Table 1.4. The unusual cyclophyllidean scolex is discussed and tentative suggestions and queries concerning the general form of the early cysticercoid are put forward.5. An attempt is made to determine more precisely than has hitherto been done for cysticercoids, the relationship of parasite and host.

Two long-billed curlews (Numenius americanus Bechstein) were collected near Elida, Roosevelt Co., New Mexico. Two species of endoparasites were recovered, the cestode Choanotaenia numenii Owen, 1946 and the acanthocephalan Mediorhynchus papillosus Van Cleave, 1916. Three mallophagan species, Cummingsiella longistricola (Wilson, 1937), Austromenopon crocatum (Nitzsch, 1866) and Lunaceps numenii numenii (Denny, 1844), were also recovered. All represent new distribution records while M. papillosus and L. numenii numenii also represent new host records.

This paper is concerned with two species of cestodes encountered in 85 owls, representing 10 species and sub-species, examined over the past 5 years. The birds examined were: great hiorned owl, Bubo v. virginianus (Grnelin); arctic horned owl, Bubo virginianus subarcticus Hov; barn owl, Tyto alba pratincola (Bonaparte); screech owl, Otus asio naevius (Gmelin); barred owl, Strix v. varia Barton; short-eared owl, Asio f. flammeus (Pontoppidan); longeared owl, Asio wilsonianus (Lesson); snowy owl, Nyctea nyctea (Linnaeus); saw-whet owl, Cryptoglaux a. acadicae (Gmelin); and burrowing owl, Speotyto cunicularia hypugaea (Bonaparte).

I found six species of cestodes, three of which belong to the genus Raillietina; one to the genus Amoebotaenia; one to the genus Choanotaenia; and one to the genus Hymenolepis. Although all of these species have been previously described, I have found some new and interesting morphological peculiarities which either differ from those previously described, or have been overlooked entirely. Therefore, a discussion of these forms is warranted.