180 MEMOIRS OP THE UNIVERSITY OP CALIPORNIA 



69. Body symmetrically bieonical, length 46/i rhomboides Schiitt 



69. Body ellipsoidal, length over 50/t 70 



70. Girdle median, minute apical point present translucens sp. nov. 



70. Girdle premedian, apex broadly rounded achromaticum Leboiir 



71. Hypocone rotund below girdle, color ochraceous yellow, striae more numerous on liypocone 



multistratum sp. nov. 



71. Hypocone contracted below girdle, color, strontium yellow, striae equal on epicone and 

 hypocone aureum sp. nov. 



Gymnodinium abbreviatum sp. nov. 



Plate 6, figure 63 ; text figure Z, 7 



Diagnosis. — A medium sized species with elongate ovoidal body, its length 

 1.94 transdiameters ; hyi')ocone elongated; girdle premedian Avith displacement 

 of 0.26 transdiameter ; sulcus extending from apex to antapex; differentiated 

 ectoplasm; surface striate and mammillated; color, hydrangea pink. Length, 

 97ai. Pacific off La Jolla, California, July, August. 



Description. — The body is long, elongate, asymmetrically ovoidal, widest anteriorly at the 

 girdle, rounded at the apices and circular in cross-section, its length 1.94 transdiameters at the 

 widest part. The hypocone greatly exceeds the epicone in size, its length being greater than the 

 extreme length of the latter by 0.27 of itself. The epicone is subconical (80°) in shape, flaring 

 widely towards the girdle, with a blunt, rounded, somewhat eccentrically placed apex inclined 

 dextrally. It has a length on the left and right sides of 0.3 and 0.47 respectively of the total 

 length of the body. The hypocone is long, flaring slightly anteriorly, tapering posteriorly, with 

 asymmetrically rounded antapex slightly notched by the sulcus, the left side being somewhat 

 longer than the right. 



The girdle is premedian in position, its proximal and distal ends joining the sulcus at distances 

 from the apex of about 0.3 and 0.47 respectively of the total length of the body. About 0.75 of 

 its course around the body is in a transverse direction and the remainder is deflected posteriorly, 

 its distal end meeting the girdle at an angle of about 45° with the main axis of the body, with a 

 displacement of 0.26 transdiameter. The furrow has a width of 0.06 transdiameter, and is rather 

 shallow with overhanging borders, the lips of which present a crinkled outline caused by the 

 unevenness in the surface of the body. The sulcus extends from the apex to the antapex, begin- 

 ning at the left of the apex and tei'minating at the right of the antapex. It forms a deep trough, 

 narrowed above and below its junctions with the girdle and enlarging considerably between 

 them. Its borders are smooth throughout. The anterior flagellar pore opens at the antei-ior 

 junction and the posterior pore at the posterior junction of the girdle and sulcus. 



The nucleus is a large, ellipsoidal body located in the pasterior half of the hypocone. Its 

 chromatin contents are arranged in fine moniliform strands. Its major and minor axes are about 

 0.48 and 0.44 transdiameters in length respectively. 



Club-shaped pusules may be present at either or both pores. The cytoplasm is finely granular 

 and is frequently filled with large salmon pink vacuoles. Besides these, oil globules of varying 

 sizes and minute refractive granules are generally abundant. Near the anterior flagellar pore 

 a large olive green food mass was present in the individual figured. The general color of the 

 organism is hydrangea pink diffused throughout the cytoplasm. The ectoplasm forms a thick, 

 distinct layer and is composed of large bosses \\ith the outer surface rounded, giving the outline 



