ANNELID GENUS CAMBARINCOLA — HOFFMAN 



357 



Figure 58-61. — Two species of the Fallax subgroup, external appearance. 58, Cambar- 

 incola fallax, new species, paratype from Tazewell Co., Virginia, with peristomium 

 extended; 59, specimen from Seneca Lake, New York; 60, specimen from Pike Co., 

 Georgia. 61, C holostoma, new species, paratype from Highland Co., Virginia, showing 

 the characteristic entire peristomium. 



elongate tentacles of varying length. Ventral half of peristomium 

 shorter, set off from dorsal by a deep lateral sinus each side, subdivided 

 into two broad lobes. 



Jaws about 10 percent of the head length, isomorphic, equal in size, 

 heterodont; the median teeth distinctly larger than the lateral cusps 

 which are nonetheless very distinct even in lateral aspect, dental 

 formula 5-5, 5-3, or 3-3, the smaller figures occurring chiefly in old or 

 large specimens. 



Male reproductive system typical for the group, the more ectal 

 organs of moderate size and occupying about two-thu-ds or less of 

 the coelom on one side of segment vi. Bursa elongate pyriform, 

 its greatest diameter at midlength; penial sheath abruptly merging 

 into the much narrower ejaculatory duct; latter half as long as bursa. 

 Spermiducal gland oriented almost dorsoventrally, extending down 

 to or beyond level of penial sheath, generally subreniform in outline 

 with an occasional enlargement homologous to the posterior deferent 

 lobe of other species; diameter of gland about equal to that of bursa, 

 but somewhat smaller in occasional specimens. Prostate gland long, 

 slender, its diameter half that of spermiducal gland near their junc- 

 ture; not extending entally as far as apex of the latter. 



