264 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



2. Color gray or pale olive green, thickly speckled with dots and 



flecks of brown or black ; head long and narrow . . . hancocki 



2. Color in life unknown ; head short ; body, of relatively great size 



when fully mature, may exceed 40 m.m in width . . . maxima 



18. Euborlasia hancocki, new species 

 (Plate 26, figs. 27, 28) 



Body. Narrow anteriorly, broad and much flattened in intestinal 

 region. Head sharply pointed, with long cephalic grooves, not demarcated 

 from body. 



Size. The incomplete fragments represent individuals of which the 

 largest must have exceeded 30 cm in length during life; width 7-12 mm; 

 thickness 1-3 mm. The smallest was only 4 mm wide. 



Color after preservation. Gray or pale olive green, thickly speckled 

 and blotched with dots and flecks of dark brown or black on both dorsal 

 and ventral surfaces. Dots are more widely separated on head and of 

 more intense pigmentation. 



Habitat and distribution. At present known only from the collections 

 of the Allan Hancock Expeditions which obtained specimens from Cha- 

 cahua Bay, Oaxaca, Mexico, at a depth of about 70 m; Bahia Honda, 

 Panama (70 m) ; 3 miles south of Ladrone Island, Panama (100 m) ; 

 Sechura Bay, Peru (17 m); and south end of Independencia Bay, Peru. 



19. Euborlasia maxima Coe, 1905 



E. maxifna Coe, 1905a. 



Distribution. At present known only from one specimen dredged at a 

 depth of 60 m in the Gulf of California. 



20. Euborlasia nigrocincta, new species 



(Plate 24, figs. 1, 2) 



Body. Rather thick and rounded but highly variable in shape, accord- 

 ing to state of contraction. Body usually twisted and snarled into shape- 

 less mass with only head and esophageal region projecting. Lateral mar- 

 gins of body rounded and often curved ventrally. Surface of body more 

 or less wrinkled with shallow longitudinal rugosities. Generally more 

 slender anteriorly and more or less contracted and thickened in intestinal 

 region, particularly at posterior end. Head pointed, with long cephalic 

 grooves ; not demarcated from body. 



