512 MEMOIRS OF THE UNIVERSITY OP CALIFORNIA 



DiMExsiONS. — Length, 104/^; transdianieter, 59j^; length of tentacle, 48/i; of 

 ocellus, 36m. 



OccuRRExcE. — A single individual was taken in a haul of a No. 25 silk net 

 5 miles off La Jolla, California, on August 21, 1917, from a depth of 83 meters, 

 in surface temperature of about 22° C. 



Activities. — The animal was not motile during the period of observation. 

 There was no indication that the lateral grooves were due to collapse, or ab- 

 normal, or moribiind condition. 



CoMPABisox. — This is the most unique species of the genus in form, color, 

 and structure, being most divergent in all structural features, such as ocellus, 

 tentacle, and pigmentation. The lateral grooves recall those of Amphidiuiian 

 cucurhita and Gymnodinium puniceum in location, form, and munber. No 

 other species of Erijfhropsis has any suggestion of such grooves, although indi- 

 cations of longitudinal lines of stress are hinted at in the tendency for periph- 

 eral vacuoles to take on longitudinally elongated forms. No other species of 

 Eyijthropsis has any finely distributed pigment outside of the pigment mass 

 and none has the divided lenses in a linear series, except E. richardi, in wliicli 

 there are only two segments to the lens. Owing to these structural features, 

 E. scarlatina stands apart from all other species as the most specialized repre- 

 sentative in the subgenus Polyopsidella, of which it is the type species. 



