coe: nemekteans of west and northwest coasts. 197 



other specimens are retained for some months in formalin as fine 

 irregular lines and rows of dots, especially on dorsal surface. In a 

 single large specimen which has been kept for 25 years in alcohol 

 the interrupted brownish lines are still conspicuous on dorsal sur- 

 face of body. 



Ocelli. — Usually 6 to 10 ocelli are placed at fairly regular inter- 

 vals on each side of head near tip of snout, and a number of other 

 irregular pigment spots are scattered back toward the brain region. 



J3ody loalls. — Cutis glands are limited to a comparatively thin 

 laver in outer third of outer circular muscular layer. Internal 

 longitudinal muscles are thin anteriorly, but increase considerably 

 in thickness in posterior esophageal region. 



Alimentary canal. — Esophagus divided into esophagus proper 

 and stomach as usual. Intestinal lobes ver}^ short, with large 

 central intestinal canal. 



Nephridia. — Nephridial canals extensive, occupying the second 

 and third fifths of esophageal region. There are usually 3 to 5 

 pairs of efferent nephridial ducts which open dorso-laterally. 



Sense organs. — Cerebral sense organs large ; cephalic furrows 

 are long and deep, and are peculiar in that the}^ extend for about 

 half the diameter of the cerebral sense organs posterior to the origin 

 of the ducts leading to the sense organs. 



Habitat. — Dredged in about 5 fms. among shells on muddy bot- 

 tom in San Pedro Harbor, California ; not common. Sexually 

 mature in August. A single specimen about 20 cm. in length was 

 collected by the Albatross at San Diego, California, March, 1878. 



36. Cerebratulus occidentalis Coe. 



Proc. Wash. Acad. Sci., 3, p. 76, PI. 6, fig. 3, 1901 ; Harriman 

 Alaska Expedition, 11, p. 76, 1904. 



This species can be recognized by the following peculiarities: — 

 Body only moderately slender, commonly 15-30 cm. or more in 

 length, much flattened posteriorly, head of moderate proportions, 

 cephalic furrows rather short; ocelli wanting; proboscis is especially 

 remarkable on account of its very small size as compared with that 

 in related species. 



Color usually chestnut brown or reddish brown anteriorly, and 



