ANNELID GEXUS CAMBARINCOLA — HOFFMAN 



323 



Spcrmatheca elongate, slender, extending up around the gut as far 

 as the niiddorsum of the coelom, not appreciably enlarged along its 

 length but divided into three general regions, viz, an ectal glandular 

 sperniatheeal duct, a median (presumably distendable) bulbar portion, 

 and an ental process composed of thick cuboidal epithelium. 



Variation. — The small quantity of specimens examined is essen- 

 tially homogeneous in all diagnostic characters. 



Affinities. — Not closely related to other members of the section. 

 The gross appearance of the genital organs is somewhat like that of 

 some species of the Mesochorea section, notably Camharincola ouachita, 

 but the histology of the prostate is an easily seen fundamental 

 distinction. 



Distribution. — Known onlv from several streams in tlie Fall Line 

 l)elt in eastern Virginia, to whicli region it may perhaps be endemic. 

 Aside from the tj^pe locality, specimens of this species are at hand 

 from one additional station: 



Virginia: chesterfield county: Stream below the lake in Camp Shawandasee, 

 May 14, 1949. P. C. Holt (PCH 211), from Cambarus acuminatus Faxon. 



VITREA GROUP 



The two species referred to this group are quite similar in most 

 respects and may eventually be shown to be geographic races of a 

 single, wide-ranging form. 



Figures 25-28. — Structural details of two species of the Vitrea group. 25, Camharincola 

 vitr^a Ellis, specimen from Sumner Co., Kansas. 26, C. osceola, new species, specimen 

 from Calhoun Co., South Carolina. 27, C. osceola, head in lateral aspect, jaws shown 

 in outline, 7.8 percent of head length. 28, C. vitrea, head in lateral aspect, specimen 

 from Beadle Co., South Dakota, jaws shown in outline, 4.8 percent of head length. 



