502 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



The tentacular recess is exceptionally deep in this species, reaching to the middle of the body, 

 where it has a width of 0.16 transdiameter in the upper 0.4 of its length. Below this it flares 

 in a campanulate outline beneath the left flap. The prod in the single individual seen was 

 quiescent and apparently contracted. Its total length in this condition was 0.4 transdiameter. 

 The smooth cylindrical shaft formed 0.5 its length and the ellipsoidal knob whose diameter was 

 1.5 times that of the shaft formed the other 0.5. There was no terminal stylet and no circular 

 wrinkles were noted, but a sheath of longitudinal fibrillae lies near the periphery of the shaft. 



The ocellus is of the compound type consisting of a group of about seven subspheroidal, 

 transparent, hyaline lenses crowded in a loose mass opposite the intercingular region of the 

 sulcus to the left of the flap. Their total volume is about the same as that of the single lens of 

 such species as E. ricliardi, of approximately the same dimensions of body. 



The pigment mass itself is black, irregularly lobed, and without fine processes. Twelve 

 droplets of similar pigment are distributed in the peripheral plasma across the equatorial region 

 of the ventral face. The core of the mass is an ellipsoidal ( ?) body, not fully exposed, extending 

 beyond the anterior end of the pigment mass. It is of a dark yellow ochre color. As a result 

 of the dispersal or absence of integration of lenses and pigment mass the ocellus extends for a 

 distance of 0.5 transdiameter obliquely anteroposteriorly on the left ventral face of the body. 

 Tlie largest group of dispersed granules lies adjacent to the mass of lenses. 



The nucleus is spherieal, very hyaline, shows no trace of moniliform chromatin threads and 

 is located in the left anterior region, extending far into the epieone. There are two pusules 

 located respectively at the anterior flagellar pore and at the right of the tentacular recess. Both 

 ai-e linear and bifurcated and their distal ends almost coalesce. Several smaller detached 

 vacuoles filled with a pinkish fluid similar to that in the pusules are present near the girdle on 

 the ventral face. 



The general color is a glaucous hyaline grey with a greenish tinge imparted by the peripheral 

 vaciioles. which are rather large, ellipsoidal to linear in form, attaining a length of 0.2 trans- 

 diameter posterodorsally. More ellipsoidal or pyriform types appear on its ventral surface and 

 a birfurcating. dendritic form was observed in the posterior part at the right of the sulcus The 

 periphery is thickly strewn with minute grey granules which have neither the color nor the 

 consistency of the pigment grains. 



DiMEXSioxs. — Length, lllj"; transdiameter, 88/*; diameter of nucleus. 45/*. 



Occurrence. — One individual was taken in a haul of a No. 25 silk net made 

 August 10, 1917, one mile off La Jolla, California, from 50 meters to the stxrface 

 and in a surface temperattu-e of about 22° C. It occurred in the same catch 

 with E. Jiispida and another undetermined species of ErijfJiropsis. 



Co]MPARisoxs. — This species belongs to the subgenus PohjopsideUa, liut is 

 unique in the subgenus in the degree of dispersal or lack of integTation of the 

 parts of the ocellus. The lens is not only organized in the largest nmnber of 

 ])arts but it is also most loosely assembled. The j^igment mass is more deeply 

 lobed and many more detached pigment granules are dispersed in the cytoplasm 

 than in any other species in the genus. It is also unique in the presence of the 

 anteriorly directed projection at the right of the sulcus over the intercingular 

 gap. 



The capitate form of prod links it with E. pavilhirdi. Intt it differs from 

 this species in all other features. The divided lens is most like that of E. h is pi da 

 or of Ponchetia juno. On the whole, next to E. extriulens, it is the most highly 

 specialized species in the genus, though nut the most aberrant one. 



