118 NEW GYEODACTTLOID TEEMATODES FROM AUSTRALIAX PISHES, 



Cirrus simple. Ovary small, elongated trausverselj' and coiled slightly. Vagina 

 double. 



From marine fishes (Elasmohranchs). 



Type species, C kroy<eri Diesing, 1850. There are various spellings for 

 this name e.g. Calycotyle, Callocotyle, CalUocotyle, Callicotyle but Calicotyle has 

 precedence. 



Ivnown species: C. kroyeri Dies., 1850 (Europe); C. mitsukurii Goto, 1894 

 (Japan) ; and C. stossichi Braun, 1899 (Europe). 



Subfamily III. PSEUDOCOTYLINAE Moniticelli, 1903. 

 Robust Monocotylidcbe, with attenuated ends; sucker exceedingly small and 

 devoid of hooks or suckers. Intestinal limbs provided with caeca. Vagina 

 paired or unpaired. Testis compact or broken up into follicles. 



26. M I c R B T H R I u M Olsson, 1868. 



Pseudocotylinae with "elliptical body with attenuated ends. Vagina un- 

 paired, opening on left of ventral surface. One lai-ge compact testis" — (Pratt). 

 From Elasmohranchs (N.W. Europe, Canada). 



Type and only known species, M. apieulatum Olss., 1869. 



The genus was described as a member of the Tristornddcte. In 1879 Taschen- 

 berg considered it to be a synonym of Pseudocotyle, as also did Monticelli (1903), 

 Braun (1890) and Stafford (1904). Pratt's figures (1900) show them to be dis- 

 tinct, and in view of our lack of the necessary literature we have listed the two 

 genera separately. 



Although Monticelli (1892, 1905) referred to Microbothrium as a synonym 

 of Pseudocotyle, yet he admitted (1905, p. 70, footnote) that it might be retained 

 as a subgenus of the latter, and at the same time proposed Leptocotyle as a sub- 

 genus, its type species being P. minor. 



Olsson (1869) in describing M. fragile, assigned this parasite of Raja hatis 

 doubtfully to Microbothrium. Braun (1890) placed it under Pseudocotyle. In 

 1897 Jaegerskiold described an ectoparasitic "Triclad {Mieropharynx parasitica, 

 n.g. et sp.) from two other Scandinavian rays B. clavata and R. laevis, and 

 mentioned its possible identity with Olsson's species. Stafford (1904) accepted 

 the synonymy and reported the presence of the worm in Canadian waters. In 

 view of these statements the species can be removed from the Gyrodactyloidea. 



27. P s E u D c T Y L E V. Beneden and Hesse, 1865. 



Pseudocotylinae in which the vagina is vei-y smaU and paired. Testis broken 

 up into numerous follicles. Intestinal caeca very long and slender. 



From skin of Elasmohranchs. 



Type species, P. squatinae Ben. and Hesse, 1865. 



Known species: P. squatinae Ben. and Hesse, 1865; P. minor Montic. 1888. 



As already mentioned above, it has been stated that Microbothrium is a 

 synonym of Pseudocotyle. In 1905 Monticelli proposed a subgenus, Leptocotyle, 

 to receive P. minor, but as w© have not access to the literature, we refrain from 

 discussing its status. 



Family IV. CALCEOSTOMIDAE (Parona & Perugia, 1890) Monticelli, 

 1903— emend. J. & T. 



Gyrodactyloidea in which the cephalic glands do not open by ducts con- 

 centrated into head-organs, but remain scattered over a considerable area on 



