490 MEMOIRS OP THE UNIVERSITY OP CALIPORNIA 



Description. — Owing to the fact that Schiitt (1895) gives only a single figure, of the dorsal 

 side, with very incomplete delineation of girdle and little of the sulcus, our description is limited. 

 However, an analysis of this figure in the light of the fuller knowledge of the genus is desirable 

 for the orientation of the species. 



The body is very rotund, its length 1.2 transdiametors. Epicone 0.25 of the total length, 

 culminating at the left in a blunt apical point, sloping to the right about 20° and ventraUy. 

 The hypocone has almost a circular outline to the level of the girdle, above which the epicone is 

 abruptly reduced, especially at the right, to 0.6 the greatest diameter, which is O.-l of the total 

 length from the antapex. The right side is more rotund than the left and the antapex is 

 hemispherical. 



The girdle is not differentiated in form in Schiitt 's figure from the preciugular and post- 

 cingular grooves. Assuming that the apical point is encircled by the upper end of the sulcus, 

 it appears that Schiitt has represented below this trough of the sulcus the precingular groove 

 and the girdle below it. It forms a descending left spiral of considerable displacement. The 

 furrow, as figured, is no more than a narrow groove. The sulcus is entirely without repre- 

 sentation, except for the uppermost part, as above interpreted. No indication of tentacular 

 recess or of the prod is given. The precingular groove is well defined, parallel to the girdle and 

 separated from it at all points on the dorsal side by a distance of 0.11 transdiameter. The 

 surface between the girdle and the precingular groove is convex. 



The ocellus is composed of a spheroidal lens of concentric layers, 0.16 transdiameter in 

 diameter, imbedded in the anterior face of a spherical pigment mass 0.23 transdiameter in 

 diameter. It is black peripherally with a reddish-brown core. These are like scattered pigment 

 granules or processes. 



The nucleus (?), as figured by Schiitt, is extraordinarily large. It is ellipsoidal in form 

 with its major axis 0.72 and its minor axis 0.48 transdiameter in length. It lies obliquely across 

 the right side of the hypocone. The surface of the body is closely set with compressed sub- 

 polygonal uniform vacuoles, about forty across the dorsal side at the equator. In optical section 

 a radially arranged group "of structures of about twice the size of the superficial vacuoles is 

 figured in the peripheral cytoplasm of the hypocone. They do not appear to be rhabdosomes, 

 nor are they in size and distribution the equivalents of the superficial vacuoles above noted. 



Dimensions.— Length, 130^^; transdiameter, IIOa^; diameter of lens, 17/*; of 

 pigment mass, 27/* ; of nucleus, 75/*. 



Occurrence.— Figured by Schiitt (1895) from the Bay of Naples or the 

 Atlantic. We have not found it at San Diego. 



Co:mparisons. — Schiitt 's figure suggests an Eri/thropsis in a moribund con- 

 dition, as indicated by the rounded form, the contracted state of the transverse 

 furrow, and by the vacuolated periphery. The absence of the extended prod 

 is confirmatory evidence of this supposition. The ellipsoidal structure in the 

 h\T30cone which we have tentatively interpreted as the nucleus may be a food 

 body. The fact that the nucleus is extraordinarily transparent in Erijthropsis, 

 and usually lies far anterior, while in Schiitt 's figure this ellipsoidal structure 

 is far posterior, gives rise to this alternative interpretation. This is the largest 

 species known in the genus, the most rotund (as figured) and has the concen- 

 trated form of ocellus resembling that of E. cornuta, E. minor, and E. e.rtrnrlcns. 



The structure of the epicone with its anterior horn or apical point with 

 encircling anterior loop of the sulcus and its precingular groove are entirely 

 typical of Erijthropsis, and not of PoucJiefia, and the ocellus is of the simple 



