COE : NEMERTEANS OF WEST AND NORTHWEST COASTS. 219 



in formalin there is no evidence that any of the stylets have their 

 heads lobed or five-parted as do those of JV. peronea. 



Alimentary canal. — The intestinal caecum, which lies in the 

 median line directly beneath the pylorus, is very short and without 

 branches ; it is much shorter than in N'. peronea., and is separated 

 from the brain by several times its length, while in N. peronea it is 

 described by Burger ('95, p. 549) as reaching nearly to the brain. 



Nervous system and sense organs. — Brain and nervous system 

 })resent no marked deviations from those of N. peronea. Cerebral 

 sense organs small, much elongated, situated far in front of brain, 

 and connected with exterior on antero-lateral borders of snout (PL 

 11, fig. 73). 



Habitat. — Pacific Grove, California, among mussels and other 

 growths on rocks at low water ; not common. Sexual jn'oducts are 

 mature in August and September. Collected in same locality in 

 1899, by C. B. Wilson. 



Paranemertes Coe. 

 Proc. Wash. Acad. Sci., 3, p. 32, 1901. 



Body of large size, rather stout, usually much rounded in tlie 

 esophageal region biit flattened posteriorly. Head not marked off 

 from body, of variable form, in some states of contraction often 

 emarginate in front. There is commonly a pair of inconspicuous 

 oblique furrows back of head. Nerve cords and blood vessels join 

 on dorsal side of posterior end of intestine. 



Mouth opens into rhynchodaeum. Proboscis sheath commonly 

 reaches but little beyond middle of body — in P. peregrina to 

 three fourths the distance towards posterior extremity. Proboscis 

 stolqW {P. pallida)., oi medium size {P. peregrina), or large (P. 

 carnea) . There is a single central stylet in proboscis, and usually 

 four or more pouches of accessory stylets. Some individuals of P, 

 peregri7ia, however, have but two. Ocelli numerous and minute in 

 the three species mentioned, while in the fourth species {P. cali- 

 f arnica) they are rei)resented by only '1 pigment spots (sometimes 

 fragmented) on tip of snout. Cerebral sense organs rather small, 

 situated in front of brain. Submuscular glands usually well devel- 

 oped in esophageal region of body. 



