NEMERTEANS 143 



Color. The color of the dorsal surface of the body is dull whitish 

 with a tinge of brown, or sometimes decidedly brownish, with two 

 narrow longitudinal bands of deep brown extending throughout the 

 length of the body. Each of these brown bands is perhaps one-eighth 

 as broad as the body. They lie near the median dorsal line, and are 

 separated from each other by about twice the width of either band. 

 On the head they lie just internal to the eyes, and do not extend quite 

 to the tip of the snout (pi. xv, fig. i). They are sharply marked 

 off from the much paler color between them, but show a tendency to 

 shade off laterally into the general pale brownish color of the dorsal 

 surface. Towards the lateral margins the brownish tinge becomes 

 very inconspicuous and gradually shades off into the whitish or pale 

 flesh color which covers the ventral surface. 



Ocelli. Four eyes of large size are arranged, as in N. peronea, 

 to form the comers of a square (pi. xv, fig. i). 



Cephalic Glands. Enormously developed cephalic glands occupy 

 the greater portion of the head and stretch far back into body, extend- 

 ing even as far back as the most anterior sexual pouches. In the 

 esophageal region these glands often occupy more space than the pro- 

 boscis sheath and esophagus together, and fill up the space usually 

 taken by the body parenchyma, which is in this species very much 

 more reduced than in N. peronea. 



Proboscis. The proboscis sheath is not much more than one- third 

 as long as the body. The proboscis is provided with eight large 

 nerves which reach back to the stylet apparatus ; the muscular and 

 epithelial layers are as in Amphiporus. Central stylet of proboscis 

 slender, provided with an elongated, slender basis, measuring (in a 

 single specimen) about 0.123 mm. in length by 0.02 mm. in average 

 diameter. 1 The basis is peculiar in being of nearly the same diameter 

 throughout (pi. xx, figs. 10, n), and not swollen posteriorly. The 

 shape of the basis alone will readily serve to distinguish the present 

 species from N. peronea, which has a short conical basis. The central 

 stylet is rather slender, but my notes unfortunately do not indicate its 

 dimensions, nor whether it is shorter or longer than the basis. Each 

 of the two lateral pouches contains usually from four to six slender 

 stylets. In the preserved specimens there is no evidence tliat the stylets 

 have their heads lobed or five-parted as do those of N. pcronea. 



Alimentary Canal. The intestinal caecum, which lies in the 

 median line directly beneath the esophagus, is very short indeed and is 



1 But a single basis was measured, so that these dimensions may not represent 

 average measurements. 



