ENCHYTR^ID^ 



77 



LUMBRICILLUS SANT^CLAR^ sp. nov. 

 p1. XIII, figs. 3 and 4; text-figs. 44-46. 



Definition. — Length 8 to 12 mm., width .5 mm. Somites about 

 50. Setas slightly sigmoid, averaging one more in the ventral than in 

 the lateral fascicles. Ventrals 6, 8, 7, 6, 5, 4, 3; laterals 6, 7, 6, 6, 

 4, 3, 3. Head-pore large, between prostomium and somite I. Head 

 blunt and rounded. Clitellum not prominent, XII and XIII. Copu- 

 lative papillse small. Septal glands thick and compact, septal part 

 about equal to interseptal part. Brain about 

 30 units long and 1 2 units broad (at center) , 

 and strongly emarginated posteriorly. Dor- 

 sal vessel rises in XIV. Intestine gradual- 

 ly widening. Spermathecse with a thick duct 

 distinct from the ampulla. A thin ring of 

 glands at the base of the duct. Sperm-ducts 

 thin, confined to somite XII. Sperm-funnels 

 slightly more than three times as long as 

 wide, curved. Penial bulb round, small. 

 Testes multi-lobed. Ovisac not extending 

 posterior to clitellum. Ventral glands in 

 XIV and XV. Nephridia thick, with a min- 

 ute anteseptal and a thick postseptal from the 

 posterior end of which the thick duct projects. 



Locality. — Banks of Santa Clara Creek, San Mateo County, Cali- 

 fornia. 



Characteristics. — The prominent feature in this species Is the 

 shape of the spermatheca and the very thin disc of glands at its 

 base. 



DETAILED DESCRIPTION. 



Three specimens were dissected and three sectioned, one of them 

 transversely. As none of the specimens had been properly fixed, no 

 attempt is made to describe the finer structure. 



Length. — The specimens at my disposal varied somewhat as re- 

 gards length, some being not over 8 mm., while others were 12 mm. 

 The somites varied between 45 and 55, the most mature specimens 

 being the largest. 



Setce vary to the extent that In some specimens the anterior ventral 

 bundles possess one more seta than in other specimens. Thus I have 

 once counted as high as nine setcc in one or two of the bundles. The 

 setae are of rather uniform size in each bundle. 



Fig. 44. Ltimbricillus 

 satitceclarcB. 



