508 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Erythropsis richardi sp. nov. 



Plate 12, figure 134; text figures SS, 10; VV 



DiAGXOSis. — A large rotund species ; body broadly ellipsoidal ; its length 1.25 

 transdiameters ; with low conical apical horn; girdle displaced 0.3 transdiam- 

 eter: ocellus protuberant ventrally; lens compound; subhemispherical in two 

 distinct sections; pigment mass slightly lobed with red core; prod (contracted) 

 stout clavate with short as;\^nmetrical stylet. Length, 106^ to 112m. Pacific off 

 La Jolla, California, August. 



Description. — The body is very stout, rotund ellipsoidal, its length 1.18 to 1.25 transdiam- 

 eters, according to the degree of contraction. Dorsoventral diameter equal to the transverse, 

 left side more rotund and slightly longer. It is widest near the middle but in contracted con- 

 dition it tends to bag out posteriorly and flatten anteriorly. Epicone low, flattened, its length 

 middorsally. excluding horn, 0.1 transdiameter. Near the distal end of the girdle it extends 

 posteriorly on the ventral side to nearly 0.5 the total length. The apex is almost squarely 

 truncate with a small low conical apical horn whose height is about a girdle's width. The total 

 volume of the epicone is less than 0.16 of that of the body. The hypocone is quite rotund, with 

 rounded, indented, asJ^nmet^ical antapex with the left side the longer. 



The girdle is almost flat for 0.75 of its course. It ascends slightly from the midventral 

 flagellar pore to pass above the ocellus, then continues a horizontal course across the left and 

 dorsal sides. At the right side it descends posteriorly at an angle of 45° across about 45° of 

 the right ventral quadrant, then turns abruptly posteriorly for about 0.25 transdiameter, then 

 turns again almost at a right angle and proceeds thence to its junction with the sulcus. No 

 attachment area was noted at its distal end. The furrow is deeply incised and is bordered both 

 anteriorly and posteriorly with a paracingular groove. The precingular groove originates about 

 a furrow's width anterior to the proximal end of the girdle, increases its distance from the 

 furrow to two furrows' widths in the dorsal region and to three or four at the distal end of the 

 girdle. The postcingular groove is quite uniformly separated by a furrow's width from the 

 girdle and has a ragged appearance. The paracingular bands or strips between grooves and 

 the girdle are clear and free from surface markings and vacuoles and their surfaces are flattened 

 or even slightly concave. They are clearly defined in this .species. 



The sulcus is little disturbed by the crowding of the ocellus upon it, and is thrown into only 

 a slight sigmoid curve by its presence. It appears to extend upon the epicone to the base of the 

 apical horn and probably to the left of it, is closely appressed in the intereingiilar region, and 

 is without lateral overlap, being in fact open by a rather wide gap into the tentacular recess. 

 This cavity extends into the axis of the body for 0.45 of its length and flares widely to 0.5 

 transdiameter at the antapical region (text fig. SS, 10). 



The prod or tentacle is a stout clavate structure, withdrawn within the recess in the resting, 

 contracted condition in which its greatest diameter, located near its middle, is 0.17 transdiameter. 

 It is axially located, posteriorly directed, and tapers distally to a blunt point which bears a 

 minute, asymmetrically placed, terminal stylet. When feebly extended it takes the form of a 

 slender asymmetrical rod continued posteriorly from a swollen base and when completely re- 

 tracted rounds up into a capitate knob (text figs. SS, 10) with or without a tip. There is a 

 faint axial retractor fiber. No circular fibers are evident and the external surface is without 

 granulations. 



The ocellus is of the compound type, though less evidently so than any of the species of the 

 subgenus Polyopsidella. It is displaced well to the left, about 0.17 transdiameter to the left of 

 the sulcus with its main axis parallel to that of the body. It protrudes strongly on the ventral 



