ANNELID GENUS CAMBARINCOLA — HOFFMAN 



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Figures 29, 30. — Reproductive systems of two species of the Vitrea group. 29, Cambar- 

 incola vitrea Ellis, specimen from Dane Co., Wisconsin. 30, C. osceola, new species, 

 specimen from Southampton Co., Virginia. 



strongly sigmoid spemiiducal gl.ind of the male reproductive system 

 and the elongate spermathecal duct with a small globose ental bulb. 



Description. — Moderate in body size, rangmg from 1.9 to 2.6 mm. 

 in length, the greatest diameter occurring at segment vii which is 

 only shghtly broader than segments v and vi; prosomites oidy of 

 very little or not of greater diameter than the metasomites. 



Head somewhat smaller than average for the genus, equaling seg- 

 ment I or less in diameter, its length somewhat less than diameter of 

 segment vir. Peristomium distinctly set off by a constriction, flared, 

 both upper and lower major lobes simple; ventral side of head usually 

 with an additional transverse constriction near the base. 



Jaws small, heterodont, dissimilar in dorsal aspect with a 5-4 dental 

 formula but very similar in lateral aspect and approximately of the 

 same size. Dorsal jaw with five widely separated acute cusps of 

 which the median and two paramedian members are of about the 

 same size, the two lateral cusps slightly smaller. Ventral jaw with 



