ALASKA NEMERTEANS I5 



2. CARINELLA DINEMA sp. nov. 

 p1. I, figs. 2, 3. 



This species somewhat closely resembles C. superha in general color 

 of body and the thread-like markings thereon. It differs from this 

 and allied species in many details, and especially in having tivo lateral 

 longitudinal white lines on each side — hence the specific name. 



Body long and slender, largest in esophagal region, rounded an- 

 teriorly, somewhat flattened on ventral surface posteriorly. Head 

 broad, flat, often emarginate in front ; lateral, transverse furrows back 

 of head deep and conspicuous. Proboscis-pore subterminal. Mouth 

 rather large for the genus, elongated and situated slightly in front of 

 second white ring. 



Color. — General color dark brown with a more or less pronounced 

 yellowish tone, becoming more nearly yellow posteriorly. The mark- 

 ings of fine longitudinal and transverse white lines on this ground 

 color are very characteristic and stable. Five parallel, longitudinal 

 lines run nearly the whole of the length of the body, and there are a 

 great number of transverse lines. Of the five longitudinal lines, one 

 lies in the middle of the dorsal surface and extends from the most an- 

 terior transverse ring to the posterior end of the body. The other four 

 lie symmetrically on the sides — two almost on the lateral margins ; the 

 other two much nearer the ventral surface. Seen in section, the distance 

 between the dorsal median line and the upper of the two lateral lines 

 on each side is 90°. Two lateral lines on either side are separated by 

 about 45°, while the remaining 90° lies between the two lower lateral 

 lines. All the four lateral lines extend from the second transverse line 

 to about ^ the distance towards the posterior end of the body. Here 

 they become interrupted, and back of this they are usually indicated 

 only by short segments and scattered dots, though their course may be 

 traced nearly to the end of the body. The five longitudinal lines are 

 all very fine and sometimes consist of rows of fine white dots closely 

 placed together. In addition to these five longitudinal lines some in- 

 dividuals show an indication of a median ventral longitudinal line in 

 the form of a row of isolated fine white dots extending from behind 

 the mouth nearly to the fifth white ring. 



The first transverse white marking lies near the tip of the snout. It 

 is somewhat wavy in outline and does not reach below the lateral 

 margin. The second white marking is broader than the first, but is 

 likewise limited to the dorsal surface. It is indicated, however, on 

 the lateral surface by two naiTow and inconspicuous spots. The third 



