ZooL.— Vol. II.] RISEN— OLIGOCH^TA. 1 59 



two layers of cells, but the inner layer is made up of very 

 narrow cells. The glandular part is slightly folded and is 

 confined to somites XVIII and XIX, or to XVIII alone. 

 The spermathec^ consist of one pair of sac-like bodies of 

 oblong shape and irregular outline. The two diverticles are 

 of unequal size. They are about one-third the length of the 

 spermatheca. The nephridia commence in somite II. The 

 four most anterior pores are in line with setas d, those fol- 

 lowing are in a line with setee c, slightly ventral to them. 

 The nephropores in the clitellar somites are much larger 

 and more transparent than the others; they are surrounded 

 by a ring of very large cells. 



Microscolex parvus, var. carolinianus, var. no v. 



Definition. — Length 45 mm. , width 2 mm. Clitelhim Vz XIII->^ XVII. 

 Papillae: two on the ventral surface of XI and one median and ventral in XII; 

 also a single ventral, median one on the boundary between XVII and XVIII, 

 posterior to the male pores. Setae deltoid in their position towards the male 

 pore, the same as in the species. Dorsal pore between III and IV but the 

 first plain one between VII and VIII. A very large dorsal pore between 

 XIII and XIV. Spermathecae larger than in the species and the diverticles 

 almost as long as the main sac. The muscular part of the prostate is some- 

 what smaller than the glandular part. The gizzard is less rudimentary, the 

 muscular layer being about three to four times larger than the corresponding 

 layer in somite VI. The septal glands in somites V to IX are less developed 

 than in the species. 



Habitat. — Raleigh, North Carolina. Two specimens col- 

 lected by Messrs. Brimley. 



As is seen, the variety differs from the species only in the 

 greater development of various interior organs. The prin- 

 cipal difference is in the spermatheca with their large 

 diverticles, those of the species being particularly small. 

 Intermediate forms with the species will no doubt be found. 



Microscolex Troyeri (Eisen). 



Deltania Troyeri Eisen, Mem. Cal. Acad. Sci., Vol. II, No. 3, 1894. 



This species is widely distributed. Specimens are rep- 

 resented from the following localities: Coulterville, Calif., 

 twelve miles east of the town in the region of the yellow 



