248 CAI.IFORXIA ACADEMY OF SCIENCES. 



outer lining is very thin, with few nuclei. The lower 

 part of the spermatheca is muscular, and appears to be 

 constructed as in Gordiodrilus. There are a few minute 

 oblong glands at the base of the spermatheca, at its junc- 

 tion with the body wall. The external spermathecal 

 papilla is, at full maturity, quite large and prominent. 

 The form and existence of the spermathecee offer im- 

 portant characteristics of specific value. In Ocnerodrilus 

 Beddardi and limicola there are small diverticula. In O. 

 agricola, O. Rosie, etc., the spermatheca is round, or 

 cylindrical, with no diverticula, while in Ooicrodriliisocci- 

 dentaUs the spermatheca? are entirely wanting. In all 

 the species examined by me the spermathecal porus is 

 situated in somite ix, but in the species described by 

 Beddard the porus, as well as the organ itself, appears 

 to be in somite viii.* The structure of the spermathe- 

 ca? in the various species is very much the same; in O. 

 sonorcB the muscular part is wanting. 



The spermatozoa are found with moderately long, 

 straight, not wavy or screw like, tails. 



Nervous sxstcui. The chephalic ganglion is about four 

 times broader than high, emitting a large, generally three- 

 forked branch, towards the prostorhium. A network of 

 bloodvessels emanating from the upper branches of the 

 lateral vascular trunks and from the dorsal vessel, is 

 spread over the cephalic ganglion in a way similar to what 

 is found in Ocnerodrilus occidentalis. The ventral 

 ganglion emits one pair of lateral ganglia in each somite. 

 The pharyngeal plexus emits one pair of ganglia up- 

 wards to the pharynx, and one pair laterally towards the 

 body wall. 



* There is some uncertainty as to its location. Beddard says once that it is 

 found in somite ix, while three or four times the statement reads in viii. 

 The former probably is a misprint. 



