366 PROCEEDINGS OF THE NATIONAL JMUSEUM vol. ii4 



from all others in terminating in a small clear bulb although not 

 histologically differentiated from the spermiducal gland. 



Description. — ^Body strongly enlarged caudally, segments vi and 

 VII about twice as wide as segment i, and tapering verj^ abruptl}^ to 

 the fairly large caudal sucker which is as broad as the head or segment 

 I. Segments very short, as little as a third of the body diameter at 

 segment vi; prosomites twice as long as metasomites but not elevated 

 above them. 



Head as long as first three body segments, but smaller in diameter 

 and thus continuing the anterior attenuation of the body; peristomi- 

 um about a third of total head length, set off by a strong basal constric- 

 tion, its margin apparently broadly lobed but not extended into 

 projections or tentacles (all material slightly' macerated). An addi- 

 tional more posterior constriction of the head occurs and imparts a 

 trisegmented appearance to the head in lateral aspect. 



Jaws relatively quite small, about 7.0 percent of the head length, 

 the dorsal jaw slightly the larger and longer, with a distinct large pro- 

 jecting median tooth; ventral jaw likewise with a median tooth and 

 subsimilar in general form to the dorsal, at least in lateral aspect (none 

 of the available material is mounted in a way to show dorsal or ventral 

 surfaces of the jaws, but careful observation indicates that the dental 

 formula is probably 3-3 or perhaps even 1-1). 



Alale reproductive system verj" small, confined to the ventrolateral 

 portion of the coelom of segment vi, extending dorsal less than half- 

 way up one side of the segment. Bursa small, cordate, the atrial 

 portion making up most of its bulk, the penial sheath confined to the 

 ental fourth of the bursa and very small hj comparison with that in 

 other species. Ejaculatory duct moderately long, its length about 

 equal to that of the bursa or spermiducal gland, its wall muscular but 

 of normal thiclviiess. Spermiducal gland and prostate collectively 

 onlj^ about as large as the bursa, their histological structure similar 

 (small, glandular, basophilic cells), but the prostate terminates in a 

 small clear l^ulb presumably homologous to that so characteristic of the 

 Philadelphica section, Spermiducal gland short and broad, at most 

 only half again as long as the diameter; prostate slender but much 

 shorter than spermiducal gland. ^Latter entally grounded, without 

 evident lobation at the entries of the small, slender deferent ducts. 



Spermathecae equally reduced, extending less than halfway up one 

 side of segment v, the shape somewhat fusiform, expanding laterally 

 from the small ectal portion and maintaining essentially the same 

 size to the abruptly acmninate ental tip. 



Variation. — Owmg to the small amount of available material, all 

 of which is slightlj" macerated from the initial preservation in weak 

 alcohol, it is not possible to dwell at any length on the observed varia- 



