212 bulletin: museum of comparative zoology. 



With E. {Eunemertes) violaceum Burger ('96) from Chile, there 

 are many points of resemblance, but the presence of large cephalic 

 glands and of comparatively large cerebral sense organs, which lie 

 only a short distance in front of brain, will serve to distinguish the 

 present species. The proboscis of E. violaceum has not been 

 described. 



Zygonemertes Montgomery. 

 Zool. Jahrb., Abth. Syst., 10, p. 2, 1897. 



Among the nemerteans of the Pacific coast are two species of 

 which one is identical with the green Aiuphijyoras virescens Yerrill 

 and the other resembles this species closely. A third form is closely 

 related anatomically, but is white in color. These three species 

 belong to the genus Zygonemektes which Montgomery ("S?", p. 2) 

 has established for A. virescens. The members of this genus are 

 closely similar anatomically to those of Amphiporus but may be 

 distinguished by the following peculiarities : — 



Body long and slender, but not so elongated as in Emplectonema; 

 head broader than neck in life, provided with two pairs of lateral 

 oblique furrows ; ocelli small and ver}^ numerous, extending posteri- 

 orly far beyond brain and above the lateral nerve cords; proboscis 

 sheath extends to i>08terior end of body, while proboscis is compar- 

 atively short ; armature of proboscis much as in Amphiporus, 

 although basis of central stylet is massive and has a concave or 

 truncated posterior end, while stylet itself is comparatively weak ; 

 usually 10, 11, or 12 proboscidial nerves. 



The worms are peculiar in life because of their long, very con- 

 tractile bodies and broad heads, and are especially remarkable 

 because of their extremely active habits, being very restless in 

 confinement and in almost constant motion, often crawling out of 

 the water and up the sides of the vessel in which they are con- 

 tained. 



