coe: nemekteans of west and nokthwest coasts. 217 



183). Eggs large; mature in Jixne. Cerebral sense organs large, 

 situated immediately in front of l)rain. 



Habitat. — The species is known only from Victoria, B. C, where 

 it was found on piles of a wharf associated va\h A. impart spino sv s^ 

 which it somewhat resembles (Coe, : 01) . 



The few individuals of this species which have been collected 

 resemble immature and pale colored specimens of Z. virescens, but 

 the present species remains whitish when sexually mature, possesses 

 fewer ocelli and differs somcAvhat in armatui'e of proboscis. 



Nemertopsis Biirger. 

 Fauna und Flora des Golfes von Neapel, Monogr. 22, p. 548, 1895. 



Representatives of this genus are characterized by extremely long, 

 thread-like bodies of firm consistency. They resemble Emplecto- 

 NEMA in form, habits, and general internal anatomy, but differ in 

 having only four ocelli, which are symmetrically placed on the head, 

 in armature of proboscis, and in other anatomical details. 



The worms ai'e quite as slender as those of the genus Cephalo- 

 THKix, but they do not coil the body in a spiral. 



Proboscis sheath very short, proboscis armed with well developed 

 central stylet and basis, and \\ith two pouches of accessory stylets ; 

 cerebral sense organs small, situated well in front of brain. Cephalic 

 glands usually well developed. 



But three species of this genus have thus far been described. Of 

 these, one occurs on the Pacific coast of North America, and the 

 other two in the Mediterranean. 



47. Nemertopsis gracilis Coe. 



Harriman Alaska Expedition, 11, p. 142, PI. 15. fig. 1 ; PI. 20, figs. 



10, li, 1904. 



PI. 11, figs. 73, 74. 



This is a very slender species bearing a close resemblance in form 

 and color to N. p)eronea (Quatr.) Biirger, but differing somewhat in 

 internal organization, especially in structure of jiroboscis armature 

 and position of anterior end of intestinal caecum. 



