ANNELID GENUS CAMBARINCOLA — HOFFMAN 299 



Systematic Treatment 



Genus Carnbarincola Ellis 



Cambarincola Ellis, 1912, Proc. U.S. Nat. Mus., vol. 42, p. 481; 1919, vol. 48, p. 

 190. — Goodnight, 1940, Illinois Biol. Monogr., vol. 17, No, 3, p. 30. — Holt 

 and Hoffman, 1959, Journ. Tennessee Acad. Sci., vol. 34, p. 102. 



Type species.— (7am6anncoZa macrodonta Ellis, 1912, by original 

 designation. 



Diagnosis. — ^Branchiobdellidae with the following characteristics: 

 Body terete, without specialized projections; jaws normally large and 

 massive, subtriangular in dorsal aspect, the dorsal jaws with a large 

 median tooth and usually two smaller cusps on each side (these 

 subequal to median tooth in one form), the ventral jaws with normally 

 a median sinus and two large paramedian dentations, or occasionally 

 of the same form as the dorsal. Anterior nephridia opening through a 

 common median dorsal papilla on segment iii. 



Male reproductive system. Bursa subpyi'iform to obcordate, becom- 

 ing broadest entally, capable of being everted; ental portion of bursa 

 modified into a penial sheath enclosing a distinct, subconical penis 

 which is noneversible but is carried to the outside by eversion of the 

 entire bursa. An ejaculatory duct is present, normally at least half 

 as long as the bursa and with strong muscular walls but not otherwise 

 enlarged or specialized; spermiducal gland relatively large, basically 

 cylindrical but occasionally compressed and/or produced into a large 

 subterminal lobe at the entry of one of the deferent ducts, histologically 

 the gland is composed of tall, columnar, basophilic glandular cells 

 surrounding a rather narrow lumen. A prostate gland is present, 

 its origin adjacent to the commissure of the ejaculatory duct and 

 spermiducal gland; length and diameter variable but normally of 

 much smaller dimension than the spermiducal gland against which it 

 is closely applied (the two structures are enclosed by a common 

 membranous sheath). Histologically the prostate may be similar 

 to the spermiducal gland or may be composed of large, vacuolated 

 cuboidal epithelial cells which contrast strongly with the smaller 

 glandular cells of the gland itself, in this condition the prostate always 

 terminates entally in a thin-walled bulbous structure. 



Female reproductive system. Spermatheca with a more or less 

 elongate ectal portion, generally distinctly muscular, and a thin-walled 

 ental portion normally expanded or enlarged and capable of much 

 distention, often with a smaller ental process. Spermatheca never 

 branched or diverticulate. 



Distribution. — So far as is Icnown, Cambarincola is endemic to 

 North America. The majority of the known species occur in eastern 

 United States, although several have been found in the Columbia 



