372 MEMOIKS OF THE UNIVERSITY OF CALIFORNIA 



steepening to about 30° in the middle part of its course. The furrow has a width of about 0.05 

 transdiameter and is deeply impressed with overhanging borders. With the sulcus it constricts 

 the body somewhat, giving to it a lightly lobed outline. 



The sulcus invades the epieone in a wide loop which terminates at the right side of the apex. 

 It makes an abrupt turn to the left after passing the anterior flagellar pore, and sweeps around 

 the body spirally with a torsion of 1.5 turns in reaching the antapex. It is narrow anteriorly 

 and in the intercingular area, widening posteriorly to about three times the width of the girdle. 

 Its constriction of the body is somewhat less than that of the girdle. The anterior flagellar pore 

 is found at the anterior junction of the girdle and sulcus, the posterior pore about one trans- 

 diameter beyond the distal junction, thus placing it on the same side of the body as the anterior 

 pore. 



The nucleus is a subellipsoidal body filled with fine, moniliform chromatin strands following 

 its longer axis. It is located in the posterocentral part of the body, slightly oblique to the 

 transverse plane. Its major and minor axes are about 0.63 and 0.43 transdiameter in length 

 respectively. 



The long sacklike pusules opening into the two flagellar pores are connected at their extrem- 

 ities by a slender canal. The cytoplasm is very clear and transparent and contains food bodies 

 and numerous blue-green oil globules in the peripheral zone. The general color of the organism 

 is pale lumiere green. It was enclosed in a thin-walled, slightly distended, h.yaline cyst. 



Di:\iEN8ioxs. — Length, 50/* ; transdiameter, 30/* ; axes of nuc-levis, 19/* and 13/* ; 

 length of cyst, 58/*. 



OccrREEXCE. — A single individual ^vas observed July 20, 1917, taken in a 

 surface haul at the end of the pier at the Biological Station at La Jolla, 

 California. 



CoMP.A^Risoxs. — This species belongs to the subgenus Cochlodininm, and in 

 its t}^)e of girdle and torsion is not unlike C. citron (fig. HH, 12), bnt lacks its 

 rhal)dosomes and has a more contracted antapex. 



Named after ^liss Marie Lebour, the investigator of the G}innodinioidae 

 of British waters. 



Cochlodinium miniatum sp. nov. 



Plate 10, figure 107; text figure GG, 6 



Diagnosis. — A large species with ellipsoidal-fusiform Ijody with minute 

 apical and larger antapical process, its length 2.4 transdiameters : ejtieone and 

 hypocone subequal ; girdle with 1.5 turns, displaced 0.6 total length ; sulcus ab- 

 ruj)th" looped about apex, extending nearly to antapex; nucleus with peri- 

 nuclear zone; surface of epieone and hypocone unequally striate; pale green 

 yellow blotched with scarlet. Length, 205/*. Pacific off La Jolla, California, 

 July. 



Description. — The body is elongated ellipsoidal-fusiform in outline, circular in cross-section, 

 its total length about 2.3 to 2.4 transdiameters (1.7 in contracted forms) at the widest part. 

 Excluding the apical and antapical prolongations, the ellipsoidal midbotly has its major axis 

 about twice its minor one and is almost symmetrical, being somewhat more tapering pasteriorly 

 and locally modified by the constricting effect of the furrows. The dorsoventral and trans- 

 diameters are equal and the epieone and hypocone are nearly so. The steep spiral course of 

 the girdle makes proportional measurements complicated. On its left side its Icngtli is 0.5 and 

 on the right 2 transdiameters. The apex is a small conical point about a girdle width in 

 diameter and height, partially encircled by the faintly developed anterior end of the sulcus. 



