[17 J OLIGOCH^TOLOGICAL RESEARCHES. 895 



sometimes constricted at the middle (Figs. Se; 8/). No spermatophores 

 are found. 



The segmental orgaus are long and very narrow ; not surrounded by 

 bladder-like cells (Fig. 8/i). 



Integument is hard aud tough. The si>ines are short, and their ex- 

 terior end not much curved. The opening between the prongs is nar- 

 row, and the upper i^roug is longer tlian the lower one. 



Length of the body, about SO'"'"; width of the same, about 1"'"' or 

 less. 



Habitat. — California, San Joaquin Eiver, in a pond, found attached 

 to decaying wood floating on or immersed in the water. 



The priucii^al characteristics of the species are the star-like concre- 

 tions round the upper end of the penis sheath. The brown color of the 

 concretion fades when the animal has been preserved in glycerine. The 

 generative organs are comparatively minute, or of about half the size 

 of those of L. alpestris. 



LiMNODRILtTS S'l'EIGEEWALDII n. sp. 



(PI. X; Fig. 9.) 



Nervous system. — The anterior part of the cephalic ganglion is the 

 widest, and emitting several large ganglionic lobes toward the cephalic 

 lobe of the body. The posterior margin is abruptly eraarginated, and 

 the whole posterior part of the ganglion is nearly globular (Fig. 9c). 



Generative system. — The generative organs are, in proportion to the 

 great length of the body, comparatiAcly short. The lower end of the 

 penis is globular, the globular jjart being situated outside of the penis 

 sheath, within which it cannot be retracted. The penis sheath is chiti- 

 nous, about eight times as long as wide. Its form is cylindrical, with 

 trumpet-shaped ends, the lower one being the widest (Fig. 9a, ps.). 

 The oviduct is muscular, thickest at the middle, round the globular 

 swelling of the penis, from here gradually tapering toward the exterior 

 orifice. The exterior orifice is sack-like, much wider and with thinner 

 walls than the interior one. In its walls the cell nuclei are all plainly 

 visible. The atrium is unusually small, and the lobes of the prostate 

 gland minute and globular. The ovaries are much bent, tapering toward 

 the extremities. The rij^e ova are found on the middle of the ovary 

 (Fig. 9/). The receptacle is nearly straight, broadest at its inner apex. 



Segmental organs are not furnished with globular cells, except their 

 inner orifice, which is surrounded by globular swellings, increasing in 

 size toward the orifice itself (Fig. 9e). The orifice is surrounded by two 

 lips, the upper one of which is furnished with a long vibrating epithe- 

 lium (Fig. 9e). 



The length of the body in large specimens 30'"'"; width of the same 

 from 0.75 to 1"^™. The body tapers gradiually toward the posterior end. 



Sahitat. — Sierra Nevada, California, in the bottom of running springs, 

 in meadows, at an altitude of 7,000 feet. 



