Ar.T. 22 TWO SPECIES OF TREMATODE WORMS PRICE 9 



Subfamily Pronocephalinae Looss, 1899 



Subfamily diagnosis. — Pronocephalidae: Cephalic collar present. 

 Genital pore to left of median line. Testes postovarial, zones coincid- 

 ing or overlapping, fields separate or touching. Parasites of marine 

 turtles and fishes. 



Type genus. — Pronocephalus Looss, 1899. 



KEY TO THE GENERA OF THE SUBFAMILY PRONOCEPHALINAE 



1. Testes intercecal, situated obliquely to long axis of body. 



Pronocephalus Looss, 1899. 

 Testes largely extracecal, situated opposite each other 2. 



2. Testes divided into several distinct follicles Diaschistorchis Johnston, 1913. 



Testes not divided into follicles. 



3. Posterior end of body more or less truncate and bearing two small, conical, 



lobe.ike projections Cricocephalus Loosf>, 1899. 



Posterior end of body rounded and without lobelike projections 4. 



4. Subventral lobes of cephalic collar not connected by a dorsal ridge. 



Pleurogonius Looss, 1901. 

 Subventral lobes of cephalic collar connected by a dorsal ridge 5. 



5. Ventral surface of body provided with longitudinal rows of glands. 



Adenogaster Looss, 1901. 

 Ventral surface not provided with glands as above 6. 



6. Testes deeply lobed ; cirrus pouch short and hardly extending medially beyond 



inner limit of left cecum; ceca in wide serpentine undulations 7. 



Testes smooth or slightly indented but not deeply lobed ; cirrus pouch long 

 and extending to median line; ceca not as above 8. 



7. Body strongly concave ventrally, wider posteriorly than anteriorly ; ceca pass 



between testes Pyelosomum Looss, 1899. 



Body not strongly concave ventrally, sides of body almost parallel ; ceca pass 

 dorsad of testes Astrorchis Poche, 1926. 



8. Limbs of excretory vesicle unite near anterior end of body. 



Barisomum Linton, 1910. 

 Limbs of excretory vesicle do not unite anteriorly 9. 



9. Limbs of excretory vesicle connected by transverse anastomoses. 



Epibathra Looss, 1902. 

 Limbs of excretory vesicle not connected by anastomoses. 



Glyphicephalus Looss, 1901. 



Charaxicephalinae, new subfamily 



Sutfamily diagnosis. — Pronocephalidae: Cephalic collar present 

 or absent. Posterior end of body provided with two conical projec- 

 tions. Genital pore to left of median line. Testes preovarial, con- 

 sisting of two rows of follicles, either intercecal or extracecal. Para- 

 sites of marine turtles. 



Type genus. — C haraxicephalus Looss, 1901. 



KEY TO THE GENERA OF TUB SUBFAMILY CHARAXICEPHALINAB 



Cephalic collar present ; testes intercecal Charaxicephalus Looss, 1901. 



Cephalic collar absent ; testes extracecal Desmogonius Stephens, 1911. 



