156 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



lected only from the west coast of Central America and the Gala- 

 pagos Islands. 



All these forms are of large size, being among the largest 

 nemerteans of their respective regions. 



11. Taeniosoma princeps Coe. 



Proc. Wash. Acad. Sci., 3, p. 62, PI. 2, figs. 3, 4, 1901. Harriman 

 Alaska Expedition, 11, p. 62, 1904. 



This species can be easily recognized from the large size of the 

 worms (becoming 2 meters long and 20 mm. in diameter) and by 

 their deep ocher yellow color, sometimes with orange or brownish 

 tinge, thickly sprinkled on dorsal surface with minute, dark red 

 spots and blotches, which are often arranged in irregular longitudi- 

 nal lines. Ventral surface paler, often with greenish tinge, without 

 the reddish spots. When body is strongly contracted anterior por- 

 tions are greatly swollen and snout is completely withdrawn into 

 posterior portion of head. 



Ocelli numerous, commonly 40 or more in an ii-regular group on 

 each side of snout. 



Cephalic glands enormously developed. 



Nephridla situated in anterior and middle portions of esophageal 

 region, provided with several small efferent ducts on each side. 



Cerebral sense organs voluminous, extending forward on the 

 external and lateral borders of the very large dorsal ganglia nearly 

 as far as the ventral commissure. 



Further details of anatomical peculiarities may be found in the 

 papers cited. 



Habitat. — A single fragmentary specimen of this gigantic nemer- 

 tean was found in .Griffin's collection from Port Townsend, Wash. 

 The species has been recorded from Cape Fox, Yakutat, and Prince 

 WiUiam Sound in Alaska (Coe, : 01) . All were found under stones 

 in hard mud at low water. 



The worms contract strongly when handled, throwing the surface 

 of the body into strong, circular wrinkles, and often coil the poste- 

 rior portion into a close spiral. 



Sexually mature late in summer ; the oviducts open dorso-laterally. 



