50 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



recognizes the genus Pulmonicola^ which was proposed by Poche 

 (1926), as distinct from the genus Opisthotrema on the ground that 

 the intercecal position of the testes in Pulmonicola puhnoTialis is too 

 great a difference to be regarded as being a character of only specific 

 value. 



KEY TO THE SPECIES OF THE GENUS OPISTHOTREMA 



1. Body piriform in outline ; distinct muscular rim absent ; in- 

 testinal ceca relatively wide, their blind ends divei-ging__ dujonis (p. 50). 

 Body oviil in outline : di.stinet muscular rim present ; intestinal 

 ceca slendei", their blind ends converging cochleotrema (p. 52). 



OPISTHOTREMA DUJONIS (Lcuckart, 1874), new combination 



Plate 11, Figure 46 



Synonyms. — Monostommii dujonis Leuckart, 1874, p. 419; Opis- 

 thotrema cochleare Fischer, 1883, pp. 1-42. 



Desci^iption. — Opisthotrema: Body piriform in outline, 9 to 11 mm 

 long by 5 mm wide; the dorsal surface is strongly convex and 

 the ventral surface concave, which gives the body the appear- 

 ance of the bowl of a spoon. Cuticle spiny on ventral surface, 

 according to Fischer, and also on anterior part of dorsal sur- 

 face, according to Johnston (1913). Oral sucker ventral, 600ju, long 

 by 850)u, wide, situated about 460/x from the anterior end of body; 

 esophagus slender, about 1 mm long by 80)it wide; intestinal ceca rela- 

 tively wide, slightly sinuous and extending to near the posterior end 

 of the body, their blind ends somewhat distended and diverging. 

 The excretory system consists of two canals, one on each side, united 

 by a commissure a short distance caudad of the intestinal bifurcation 

 and again by a similar commissure about midway between the in- 

 testinal bifurcation and the posterior margin of the oral sucker. 

 Each of the canals is provided with lateral branches, which extend 

 to the margin of the body. Excretory vesicle ( ? ) ; excretory pore 

 ( ? ) . According to Fischer, the canals terminate near the ends of the 

 ceca and probably open separately. The cirrus pouch is cylindrical, 

 2 mm long by 245/x, wide, situated in the median line in the posterior 

 part of the body, containing a greatly convoluted seminal vesicle and 

 a slender protrusible cirrus; genital pore ventral, near posterior 

 margin. Testes lobed, 250/a to 540/>i in diameter, situated in the same 

 transverse plane and extracecal in position. Ovary small, lobate, 

 situated to the left of the median line and a short distance cephalad 

 of the level of the testes; Mehlis's gland small, caudad of ovary; 

 Laurer's canal jDresent, the proximal part of the canal being expanded 



