COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 175 



Euborlasia Yaillant. 

 Buff oil's Hist. Nat. des Annel^s, 3, Paris, 1890. 



Body usually of large size, remai'kably thick and massive, usually 

 nearly cylindrical when fully extended, but very broad and much 

 flattened in intestinal region when strongly contracted. Head con- 

 tinuous with body, but esophageal region often sharply demarcated 

 from intestinal region when contracted. Bodv is not coiled in a 

 spiral, and worms do not swim, but crawl about with a snail-like 

 motion by extending and contracting the body to an enormoiis 

 extent. When contracted, intestinal region is often much flattened, 

 with thick lateral margins ; it is convex above and concave beneath, 

 and exhibits transverse constrictions at intervals. 



Ocelli wanting ; proboscis sheath usually much shorter than body ; 

 caudal cirrus absent ; muscular layers of body possess a bright red- 

 dish tinge in life. 



But two species of this restricted genus have as yet been 

 described ; one of these occurs on the coasts of England and in the 

 Mediterranean, while the other has been recorded from the latter 

 locality only. A third species is represented in these collections by 

 a single specimen fi-om Lower California, and this specimen exceeds 

 in bulk an}^ nemertean as yet described. 



22. Euborlasia maxima, sp. nov. 

 PI. 4, flg. 40. 



This gigantic form possesses a body having a diameter far exceed- 

 ing that of any described species of nemertean. After preservation 

 for 13 years in alcohol, the body in the intestinal region still meas- 

 ures nearly 45 mm. in diameter and is about 10 mm. in thickness. 

 Length of body of the single ])reserved specimen, which is strongly 

 contracted but perfectly complete, 29 cm. General shai)e of body 

 (PI. 4, fig. 40), much as in E. ellzabethae. 



Esophageal region cyUndrical after preservation, measuring in 

 this specimen 15 mm. in average diameter, considerably thicker and 

 broader near the head than toward the intestinal region. Intestinal 

 region . strongly flattened, but with rounded edges, widest in its 



