PARASITIC WORMS BERMUDA. I. TREMATODES. | 221 



Paares, welches uber clem ]Mun(lsaiignapfe eine einfache Querana- 

 stomose der Schenkel bildet. Genitalporus etwas Hnksseitig von dera 

 Bauchsaiignapfe, Copulationsorgane vorhanden. Cirnisbeutel cy- 

 lindrisch, von betraehtlicher Ltingc, in seinem Innern eine mehrfach 

 gewunden, sehlanke Sanienblase, lange, cylindrische Pars prostatica 

 und dicker Penis, der sich im ausgestiilpten Zustande nach seiner 

 Spitze zu merklich verjilngt. Hodeii stark seitlich hinter dem 

 Bauchsaiignapfe. Keimstock seitlich vor ihnen; Laurer'scher Canal 

 und Receptaculum seminis vorhanden. Dotterstocke in den Seiten 

 und unter der Riickenflache, 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 Tvlagens von Seeschildkroten. Typus: 

 P. irroratns (R.)." 



The trematode from ChcJonia imbricata which I have described has, 

 in general, the characters of the genus Pachypsolus, 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 Irwratus several 

 essential differences are e\'ident. 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 diiTuse 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 Pachypsolus irwratus (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, Pachypsolns 

 omlis, found in large numbers in the intestine of a Loggerhead Turtle 

 {Caretta caretia) from the Tortugas. A third species, Pachypsolus 

 tcrtius, 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. irroratvs in minor 

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

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



