COE: XEMERTEANS OF WEST AND NORTHWEST COASTS. 279 



Parenchi/ma. — When proboscis is extruded, a moderate amount 

 of parenchyma lies above tlie proboscis sheath, but is hardly evident 

 when proboscis is in place and its sheath much distended. 



Alimentary canal. — Much branched intestinal caeca extend for- 

 ward to brain region, where a single pair of diverticula either passes 

 forward above dorsal ganglia or abuts closely against their posterior 

 faces according to state of contraction of cephalic tissues. Pylorus 

 continues posteriorly for a considerable distance beyond the most 

 anterior sexual glands, both in males and females, before opening 

 into dorsal wall of intestine. 



Nephridia. — Nephiidial tubules extend forward as far as the 

 brain, but do not reach far back into esophageal region. A single 

 pair of efferent ducts passes to ventrolateral surfaces of body a few 

 sections behind brain, and near anterior portion of nephridial region. 



Cerebral sense organs. — These are voluminous and much elon- 

 gated. They are situated, mainly in front of brain, although their 

 posterior extremities extend posteriorly beneath the ventral ganglia. 

 In the living worm they appear to be from one half to two thirds 

 the size of the dorsal ganglia. 



Reproductive organs. — Sexual products are mature in August. 

 Ducts of genital glands in both sexes open above lateral nerves. 

 When spermaries lie near ventral surface of body their ducts pass 

 dorsally to open on lateral margins of body immediately above 

 lateral nerves, while those glands which are situated in dorsal portion 

 of body open more dorsally than the others, but yet near the lateral 

 margins of body. 



Habitat. — Common on piles at Monterey, San Pedro, and San 

 Diego, California ; also under stones and among algae in same 

 localities. 



70. Amphiporus leptacanthus, sp. nov. 

 PI. 22-, fig. 161. 



Body of moderate proportions for genus ; rather small ; specimens 

 obtained measuring about 15 mm. in length and 1.5 mm. in width. 



Color. — Whitish with tinge of yellow or flesh color anteriorly, 

 buff or light brown in intestinal region. 



Ocelli. — ^ Usually 16 to 20 or more ocelli of medium size on each 



