428 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Occurrence. — One individual taken in a haul of a ¥0. 20 silk net in liaid 

 No. 1395, June 24, 1907, from 100 meters to the surface 2 miles off La Jolla, 

 California, in latitude 32° 53-1 N, 117° 17^3 W, in surface temperature of about 

 16?5 C. 



Comparisons. — This species is built for rapid locomotion, as shown by its 

 shape and its furrows. Its nematocysts are small as in N. parfifnm, and it 

 shares with the other species in the genus the posterior location and transverse 

 direction of the ocellus, the continuation of the spiral course of the sulcus be- 

 yond the posterior flagellar pore on to the dorsal side of the antapex, and the 

 clustering of the nematocysts about the nucleus. It is highly specialized in 

 form, in grouping of the nematocysts and integration of the lens. 



