[11 J OLIGOCH^TOLOGICAL RESEARCHES. 8S9 



II. Ffrrierii, but of about the same length as iu II. SodaUs. The dis- 

 tance between tlie ventral gauglion and the external generative porns 

 is comparatively great, or about as long as the length of the penis and 

 oviduct together (Fig. M). The penis is not furnished witli any penis 

 sheath (Fig. -le). The oviduct is single, chitinous and somewhat fun- 

 nel-shaped. Both penis and oviduct are narrowed a little below the 

 middle, but from here they increase in size, and the apex of both are 

 considerably swelled (Fig. 4e). Numerojis longitudinal muscles are 

 attached with one end to the interior surface of the upper end of the 

 oviduct and with the other to the body wall (Fig. 4e, ms. cL). The recep- 

 tacle is straight, the top inflated, very large, globular, supported by a 

 small narrow stem of less length than half the diameter of the inflated 

 top. The walls of the receptacle are extremely pellucid, much more so 

 than in the preceding species. jSTo spermatophores found. 



The integument is more pellucid than in any other species of the 

 genus. The body is of a fine red flesh color, and in size its anterior 

 part not much thicker than its tail. 



The spines are of three kinds, viz: hair spines, pseudo comb-like 

 spines, and forked spines (Fig. 4c). The prongs of the pseudo comb like 

 spines are only very slightly serrated. 



The length of the body about 15""" (Fig. 4«). 



The segmental organs are covered with large oblong inflated cells, 

 especiallj' their inner free t'nd (Fig. 4 r/). 



Habitat. — California, Fresno County, Sierra Nevada ; in running water 

 in meadows, at an altitude of from 5,000 to 7,000 feet. 



Gen. HEMITUBIFEX, nor. gen. 



(I'ls. VII and VIII; Fig. (i.) 



Nervous fti/atem. — The cephalic ganglion emarginated both in front and 

 behind. 



Generative system. — The efferent <luct is very long and narro^^', as in 

 Tuhifex. The upper end of the atrium is enlarged, and forms a globular, 

 so-called " vesicula seminalis," ui)on which the prostate gland is grafted. 

 The lower end of the atrium is glandular. The penis sheath is chitinous, 

 shorter than the oviduct. The oviduct is double-sheathed, both sheaths 

 being chitinous and funnel-shaped, and the outer one surrounded by 

 longitudinal muscles. The base of the receptacle is furnished with 

 accessory glands. The spermatophores are short, thick, and inclosed 

 in a pellucid bag. 



The integument is not covered with opaque pai)illae. The spines are 

 of two kinds, A'iz, forked spines and hair-spines. The latter, however, 

 are not always present, as some individuals are found without them. 

 Whenever found they are only sparingly distributed on the upper side 

 of the body. No comb-like spines. 



The shape of the atrium, the double oviduct, and the irregularity of the 

 number of the hair-spines are characteristics distinguishing this genus 



