184 bulletin: museum of compaeative zoology. 



at irregular intervals in a marginal row on each side, which extends 

 posteriorly about to the end of the corresponding cephalic furrow. 



Proboscis sheath extends quite to posterior extremity of body. 



Body tcalls. — Internal longitudinal muscular layer comparatively 

 thin throughout whole length of body. Lateral nerves of unusually 

 large size, and with remarkably distinct nerve plexus outside cir- 

 cular muscular layer in esophageal region. Cutis glands massed in 

 a very dense layer, occupying outer half of outer longitudinal 

 musculature. 



Cephalic glands remarkably voluminous, occupying a great por- 

 tion of tissues of head in front of brain, but not extending behind 

 brain. 



Alimentary canal. — Esophageal region differentiated into eso- 

 phagus proper and stomach, characterized by peculiarities of 

 epithelial lining as usual. Intestinal lobes very short, with a 

 comparatively large central canal. 



Nephridia are situated in middle third of esophageal region, and 

 send numerous small branches among the esophageal blood lacunae. 

 Two or more pairs of efferent nephridial ducts open on dorso-lateral 

 surfaces of body. 



The usual pair of large cephalic blood lacunae are united by a 

 very broad anastomosis anteriorly. 



Sense organs. — The three terminal or frontal sense organs are 

 fairly well developed. Ocelli are situated deep in tissues of head. 

 Cerebral sense organs remarkably large, intimately connected with 

 dorsal ganglia and bathed in lateral blood lacunae as usv;al. 

 Cephalic furrows moderately deep. I^rain very large. 



Reproductive organs. — Sexually mature in August. Ova yel- 

 lowish in color, of large size, commonly not more than 6 to 10 in 

 each pouch. 



Habitat. — In crevices of ledges at extreme low water, Pacific 

 Grove, California. Not common. 



27. Micrura olivaris, sp. nov. 



Body small, but comparatively short and stout, rounded ante- 

 riorly, flattened in intestinal region. Head rather broad, cephalic 

 furrows extend as far back as anterior border of mouth. Posterior 



