316 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Description. — The body is broadly ellipsoidal with broadly rounded, faintly subconical apices, 

 its length 1.49 transdiameters at the widest part, which is below the girdle. A ci-oss-section is 

 nearly circular in outline. The hypocone exceeds the epicone in size, its length being greater by 

 0.2 of the total length. The epieone is rounded conical in shape, with broad, smoothly rounded 

 apex. It has a length on the left and right sides of 0.21 and 0.57 respectively of the total length 

 of the body. The hypocone has a length on the left and right sides of 0.73 and 0.4 of the total 

 length of the body. Its sides are somewhat more convex than those of the epicone and taper more 

 towards the antapex, which is usually narrower than the apex. The right side of the body has 

 a slightly greater convexity than the left side. 



The girdle is premedian in position for the greater part of its course. Its proximal end joins 

 the sulcus at a distance from the apex of 0.21 and its distal end 0.57 respectively of the total 

 length of the body. The first 0.5 transdiameter of its course follows an almost transverse direction 

 around the body, beyond which it turns posteriorly in a gradually steepening angle which becomes 

 about 45° with the longitudinal plane of the body, at its junction with the sulcus. The furrow 

 has a width of about 0.06 transdiameter and is deeply impressed, undercutting the lip on tiie 

 anterior side and sloping gi-adually out to the posterior lip. The sulcus begins below the apex 

 and extends po.steriorly to near the antapex in a sinuous, slightly sigmoid curved line. It begins 

 as a shallow trough and deepens through tlie intercingular part of its course, becoming shallow 

 distally and fading out near the antapex. The anterior flagellar pore opens at the anterior 

 junction of the girdle and sulcus, the posterior pore about one width of the girdle below the 

 distal junction. 



The nucleus is a relatively large, spheroidal body filled with coarse, moniliforra chromatin 

 strands, which lie in the longitudinal plane. It is situated in the anterior part of the body or 

 immediately dorsad from the intercingular region. Its axis is about 0.48 transdiameter in length. 



Large, saeklike pusules are usually present at either or both pores. The cytoplasm is very 

 finely granular, clear, and transparent. Food inclusions are usually present in the body, indi- 

 cating a holozoic mode of nutrition. In the individual figured a large mass, buffy citrine in 

 color, filled the posterior part of the body immediately behind the nucleus. A few minute 

 refractive granules were scattered through the cytoplasm near the nucleus. The cytoplasm is 

 pearl grey in color. 



The most striking feature of this organism is its pigmented coloration. This is found in the 

 euticular la.ver and along the lines of striae. The surface is closely beset with equidistant, longi- 

 tudinal lines, having a very faint, fluorite violet color. These are about 2.5 times as numerous 

 on the hypocone as on the epicone, where there are 15 across the ventral face. They are further 

 marked, generall.v throughout their entire length, by minute granules, fluorite violet in color, 

 strung along the lines like beads on a string. The number of these varies slightly in difi'erent 

 individuals and they are frequently scant.v in the antapical region. In addition to these the 

 peripheral zone in the epicone contains large agglomerated masses of the .same pigment. The 

 color of these larger masses is frequently so deep as to appear almost black when viewed under 

 the low powers of the microscope. This pigment evidently has the same power of movement as 

 that found in Gymnodinium lineopumcum and Gyrodinium ncliracrum. 



Di:mensions. — Length, 61-73/s transdiameter, 41-51^1; axis of nucleus, 

 20-22/^. 



OccTRRENCE. — The first specimen was taken July 5, 1904, 12 miles off Point 

 Loma, California, with a No. 20 silk net, in a haul from 355 meters to the 

 surface. It was again met Avith Jiih" 3, 1916, in a surface haul made at the end 

 of the pier at the Biological Station at La Jolla, California. Throughout July 

 and August, 1917, it Avas present in most of the hauls made at La Jolla, l)oth 

 in surface hauls and in the deeper hauls made farther offshore. The individual 



