ANNELID GENUS CAMBARINCOLA — HOFFMAN 307 



and spermiducal gland. In this respect it represents an advancement 

 over the strongly lobed gland of ouachita. 



Distribution. — Known only from the type locality. Presumably 

 the species will be found to have a sporadic local distribution in the 

 adjoining parts of Arkansas and Missouri. 



Remarks. — The name restans is from the Latin; its meaning "left 

 behind, exiled" seems particularly appropriate for the denomination 

 of this odd, archaic creatm-e. 



Cambarincola niesochorea, new species 



Figures 6, 11, 12, 13 



tBranchiohdella americana Pierantoni, 1912, Ann. Mus. Zool. Univ. Napoli, new 



ser., vol. 3, No. 24, p. 17. 

 Cambarincola vitrea (in part) Ellis, 1919, Proc. U.S. Nat. Mus., vol. 55, pp. 257, 



25S (Douglas Lake, Michigan, record). 

 Cambarincola macrodonta (in part) Ellis, 1919, Proc. U.S. Nat. INIus., vol. 55, 



p. 257 (Morgan City, Louisiana, record). 



Type specimens. — Holot3'pe and four paratypes, USNM 29939, 

 from Orconedes sp. collected in a small gravelly stream 1.5 miles east 

 of Adyville, Perry County, Indiana, by P. C. Holt, July 28, 1958. 

 Additional paratypes indicated in the list of material examined. 



Diagnosis. — A large species of the Mesochorea group characterized 

 particularly by the very large prostate gland, which sm-passes the 

 spermiducal gland in both length and diameter. Spermiducal gland 

 without a large subterminal posterior deferent lobe. 



Description. — Body moderate to fairly large, ranging from 2.8- 

 4.2 mm. in length, the greatest diameter occurring at segment vii, 

 tapering gradually cephalad to segment i which is considerably 

 narrower than the head; latter as long as the first three body segments 

 combined; sucker appreciably broader than the two preceding seg- 

 ments, and as broad as the head. 



Subsegments of the body of equal diameter, the prosomites about 

 twice as long as metasomites. Most body segments of about the 

 same length, except segment vii is longer than the others, and ix and 

 X are slightly shorter. 



Head rather long (about equal to first three body segments) and 

 cylindrical, without subsegmentation except for the pronounced 

 constriction at the base of the peristomium. Latter about a third 

 the total head length and distinctly flared, its margin entire and 

 unlobed. Jaws of moderate to fairly large size, subequal to each other 

 m length and width, tlie dental formula 5-4. 



Male reproductive system of moderate size, occup5'ing about half 

 of the area of one side of the sixth segment. Bursa small and sub- 

 pyriform, as broad as long, or slightly broader; ejaculatory duct about 



