PAEASITIC WOKIMS BERMUDA. I. TREMATODES. 221 



Paares, welches uber dem Mundsaugnapfe eine einfache Querana- 

 stomose der Schenkel bildet. Genitalporus etwas linksseitig von dem 

 Bauchsaugnapfe, Copidationsorgane vorhanden. Cirrusbeutel cy- 

 lindriscli, von betrachtlicher Lange, in seinem Innern eine mehrfaeh 

 gewunden, schlanke Samenblase, lange, cylindrische Pars prostatica 

 und dicker Penis, der sich im ausgestiilpten Zustande nach seiner 

 Spitze zu merklich verjiingt. Hoden stark seitlich hinter dem 

 Bauchsaugnapfe. Keimstock seitlich vor ihnen; Laurer'scher Canal 

 und Receptaculum seminis vorhanden. Dotterstocke in den Seiten 

 und unter der Riickenfliiche, aus in der Jugend deutlich sternformigen 

 FoUikelgruppen zusammengesetzt, Uterusschlingen hauptsachlich 

 hinter den Hoden die ganze Breite des Korpers ausfiillend und nur 

 die Enden der Darmschenkel freilassend. Eier zahlreich, klein, mit 

 zugespitztem Deckelpol und dickerm Hinterende, zwischen 0,04 und 

 0,05 mm. lang. Bewohner des Magens von Seeschildkroten. Typus: 

 P. irroratus (R.)." 



The trematode from Chclonia imbricata which I have described has, 

 in general, the characters of the genus Pachy psoitis, and I do not 

 hesitate to place it in that genus. When compared with the trema- 

 todes described by Braun and Looss under the name irroratus several 

 essential differences are CAident. Externally the following may be 

 noted. The absence of spines, or scales, which may, however, have 

 been lost, the very large and more nearly equal size of the suckers, the 

 ventral cup-like depression and the non-salient genital pore. In- 

 ternally, the position of the testes and ovary nearer the acetabulum 

 and the less diffuse arrangement of the vitelline masses, which are 

 more nearly like those described by Braun, may be noted. The most 

 striking and essential difference, however, is the size and position of 

 the cirrus pouch, which in Pachy psolus irroratus (PI. II, Fig. 11) bends 

 around the acetabulum, its posterior end extending to the level of, 

 or posterior to, the ovary, while in the form here described (PI. I, 

 Fig. 3) the cirrus pouch is much shorter, parallel with the dorso- 

 ventral axis of the body and entirely anterior to the acetabulum. 



Linton (1910, p. 24) has described a new species, Pachypsolus 

 ovalis, fovmd in large numbers in the intestine of a Loggerhead Turtle 

 (Caretta cardta) from the Tortugas. A third species, Pachypsolus 

 tertius, has been described by Pratt (1914, p. 416) from the small 

 intestine of the same host and of the same locality. The species 

 described by Linton and by Pratt differ from P. irroratus in minor 

 points and distinctively in the position and extent of the cirrus pouch. 

 Pratt (1914, p. 418) describes the cirrus sac in P. tertius (PI. II, Fig. 9) 



