THE TREMATODE PARASITES OF FISHES. 473 



Genus Pseudocotyle v. Ben. & Hesse. 



51. P. squatinae v. Ben. & Hesse. 



Genus Calicotyle Diesing. 



52. C. kroyeri Diesing. 



DIGENEA. 

 DJSTOMATA PROSOSTOMATA. 



Family ALLOCREADIIDAE. 



Sub-Family Allocreadiinae. 



Genus PODOCOTYLE (Dujardin). 



Podocotyle atomon (Kud.). 



Odlmer, 1905, pp. 320-6. 

 Lebour, 1908, pp. 26-27. 



This parasite was obtained from ten species of fish, namely, Gobius 

 ruthensparri, Centronotus gunnellus, Cottus bubalis, Cyclogaster montagui, 

 Gastraea sjnnachia, Gadus merlangus, Pleuronectes flesus, Zeugojjterus nor- 

 vegicus, Nerophis aequoreus, and Anguilla vulgaris. This is the first record 

 of its occurrence in the pipe-fish {Nerophis). 



Podocotyle refiexa (Creplin). 



Odhner, 1905, p. 326. 



This species was obtained from the intestine of Gastraea spinachia and 

 Onos mustela on several occasions. It is distinguished from the previous 

 species by its much longer cirrus-pouch and the interrupted arrangement 

 of its yolk glands. The limits fixed by Odhner for the size of this species 

 are too narrow, as mature specimens little over 1 mm. in length were 

 found in Onos mustela. It is extremely difficult to differentiate such small 

 specimens from P. atomon. 



Podocotyle syngnathi Nicoll. 



Nicoll, 1913a, pp. 238-40. 



This species was frequently found in the pipe-fishes, Syngnathus aciis, 

 Siphonostoma typhle and Nerophis aequoreus. 



