COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 259 



Other situations than that stated. Until other specimens have been 

 collected, the view that the species is but temporarily free-swimming 

 seems most reasonable. From the use of the electric light, we must 

 infer that the specimens were taken in the evening, although the 

 hour is not stated. 



63. Amphiporus gelatinosus, sp. nov. 



PI. 19, figs. 119, 120 ; PI. 20, figs. 122-127 ; PI. 25, fig. 204. 



Body broad and much fiattened after preservation, its widest part 

 not far back of head; head rather narrow, but a little wider than 

 parts immediately following, demarcated from body by a pair of 

 conspicuous lateral furrows which reach dorsally well toward the 

 median line (PI. 25, fig. 204) . The single specimen measured after 

 preservation about 7.5 mm. in length, (3 mm. in width, and about 

 3 ram, in thickness. 



Color. — In general a])pearance the specimen is somewhat trans- 

 lucent and gelatinous. It is perfectly colorless and gives the 

 impression that it was whitish in life, but this is, of course, only 

 a supposition. 



Ocelli. — On each side of the head is a broad cluster of thirty or 

 more large ocelli. These are scattered irregularly on each side and 

 reach from near the proboscis pore back nearly to the lateral, trans- 

 verse furrows (PI. 25, fig. 204). As seen in sections, the ocelli lie 

 mostly directly beneath or imbedded in the longitudinal muscles of 

 the head (PI. 19, fig. 119). They are provided with large nerves. 



Body walls. — In cross section of the body the most striking 

 peculiarity is the enormous development of the gelatinous tissue or 

 parenchyma, which fills up a broad space between the muscular 

 layers of the body and the intestine, proboscis sheath, and other 

 organs (PI. 19, figs. 119, 120). The muscidar layers are as in other 

 species of the genus, but are very thin as compared with the diame- 

 ter of body. 



In no other described species of the genus is the parenchyma 

 developed to such an extent as in the present species. In the 

 esophageal region (PI. 19, fig. 120), the parenchyma is several times 

 as voluminous as the stomach, and even in the intestinal region 

 (PI. 20, fig. 122) is but little less highly developed. This great mass 



