COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 251 



genus, rounded, of nearly the same diameter throughout; head 

 somewhat wider than neck when well extended. Matiire worms 

 are usually 10 to 30 cm. in length and 2 to 3 mm. wide. 



Ocelli. — Ocelli small, but exceedingly numerous, numbering 150- 

 250 in very large individuals; small specimens may possess less 

 than 50, and those of medium size from 70 to 100. They are 

 arranged in two elongated clusters on each side of head — an 

 anterior, marginal cluster on each antero-lateral border of head, and 

 a posterior, cerebral cluster lying somewhat })osterior to the mar- 

 ginal group and nearer the median line. Each of the posterior 

 clusters meets its fellow in the median line to form a single V-shaped 

 group with the apex directed anteriorly 

 (PI. 17, fig. 102 ; Text-fig. 23). The two 

 marginal clusters likewise converge nearly 

 to the middle line at the tip of the snout. 



Color. — Color opaque white, very pale 

 flesh color, pale yellowish, or pinkish drab, 

 through which the intestinal canal is con- 

 spicuous because of its drab, brownish, or, 

 occasionally, pale orange color. Brain is 

 distinctly reddish, as are also the lateral 

 nerves which appear as reddish or yellow 

 lines on each side of body. 



Proboscis. — Remarkable in having 6, 

 8, or 12 pouches of accessory stylets, each 

 with one or two slender stylets ( PL 17, fig. 

 102; Text-fig. 13). Most individuals have 

 either 8 or 1 2 accessory pouches, those with 

 but 6 being comparatively rare. Central 

 stylet slender, basis massive (Text-fig. 54). 

 In a rather small individual the central 

 stylet measured 0.126 mm. in length ; basis 

 was 0.24 mm. long and 0.13 mm. wide in 

 its A^ddest portion. There is considerable 

 variation in size of stylet apparatus in dif- 

 ferent individuals, however. In most 



specimens the stylet is from one half to three fifths the length of the 

 basis. There are usually about 30 proboscis nerves. 



Cephalic and submuscular glands are very highly developed. 



Fio. 54. — Amphiporiisformi- 

 dabills. Outline of central 

 stylet and basis of large 

 individual, x 175. 



