226 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



haul from 80 meters to the surface and in a surface temperature of 22^2 C. 

 The same species was noted July 27, 4 miles off La Jolla, in a surface haul with 

 a surface temjDerature of 21-9 C. 



Comparisons. — This form is unique among the G\T2inodiniidae in having its 

 surface striae extending in an ohlique rather than a longitudinal direction. 

 This is apparently not the result of any torsion of the hody. In forms having 

 a greater torsion of the body, as Gyrodiniian and Cochlodinium, the course of 

 the surface striae, where such are present, is invariably longitudinal, with 

 only a slight tendency to follow the course of the sulcus on the left side. In 

 Gymnodinium Uneatum this tendency is greatly exaggerated until the striae 

 on the right side of the body are cut off in their course by the sulcus. It belongs 

 to the subgenus Lineadininm, close to G. ruhruiii, which it approaches in pro- 

 portions and size as well as in color. Its surface markings are quite different 

 and its nucleus lacks the clear zone of that in G. ruhrum. 



Gymnodinium lineopunicum sp. nov. 



Plate 6, figure 65 ; text figure X. 17 



DiAGXosis. — A medium sized species with broad, ovoidal body, its length 1.09 

 transdiameters ; girdle forming a complete circle about the middle of the body ; 

 sulcus short on epicone and hypocone ; color, pomegranate purple. Length, 78^. 

 Pacific off La Jolla, California, August. 



Description. — The body is rotund, ovoidal, broad anteriorly, tapering posteriorly, circular 

 in cross-section, its length 1.09 transdiameters at the widest part. The epicone is larger in 

 extent than the hypocone. It is hemispherical with broad apex and symmetrically rounded sides. 

 Its length is about 0.47 of the total length of the body. The hypocone has the shape of a cone 

 of about 75°, with a broad base and a blunt antapex. Its sides are symmetrical and very slightly 

 convex. 



The girdle forms a complete circle about the middle of the body. Its distance from the apex 

 is 0.47 of the total length of the body. The furrow is wide, about 0.04 transdiameter, and rather 

 deeply impressed. The anterior border is undercut somewhat, the furrow gradually rounding 

 out to the posterior border. The sulcus is a very short, deep trough at its junction with the 

 girdle, soon fading out both anteriorly and posteriorly, its length on the hypocone being about 

 twice that on the epicone. The anterior flagellar pore opens at the junction of girdle and sulcus. 

 The posterior pore is about two widths of the girdle below the anterior one. 



The nucleus is a small, broadly ellipsoidal body, placed slightly posterior to the central part 

 of the hypocone. It is filled with coarse, moniliform, chromatin strands. Its major and minor 

 axes are 0.3 and 0.21 transdiameter in length respectively. 



A small sacklike pu.sule opens into each flagellar pore, the anterior one exceeding the posterior 

 one in size. The cytoplasm is finely granular, clear and translucent. The individual under 

 observation had ingested a Pouchctia, probably P. ruhrum, which was in process of digestion. 

 A trace of the girdle remained, with the nucleus and ocellus still intact. The rose color was 

 still present but diffusing out through the surrounding cytoplasm of the devourer. Nutrition 

 in this species is patently holozoic. 



The most striking feature of this organism is its color, which makes it a conspicuous object 

 when placed under the microscope. The background of translucent cytoplasm is a pale turtle 



