472 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



of the total length of the body in length. The antapex is rounded, asymmetrical, longer upon 

 the right side, the deep channel of the distal end of the sulcus forming a broad trough, deeply 

 furrowing its left ventral face and slightly notching the antapieal margin. 



The junction of the girdle and the sulcus occurs at a distance of 0.3 of the total length of the 

 body from the apex. Thence the furrow sweeps around the body in a uniformly descending 

 left spiral of 1.25 turns as a broad, rather deep trough, its width being 0.07 transdiameter. In 

 an individual which had devoured a thecate Pc7-idinium (fig. PP, 2) the girdle is distorted so 

 that it steepens rapidly in the proximal half to 50° from the horizontal, flattens again almost 

 to the horizontal middorsally, and then descends gently at 20° to its posterior junction with the 

 sulcus. This occurs at 0.25 of the total length from the antapex. The sulcus takes origin at or 

 very near the apex. It sweeps 0.25 turn around the epicone to its anterior junction with the 

 girdle. It forms a deep ti'ongh in its posterior course, with a total torsion of 0.5 turn of a 

 descending left spiral, and widens below its distal junction with the girdle to twice its width 

 above. Below the junction it curves across the In^iocone to the antapex. notching its postmargin 

 slightly. The lips of both girdle and sulcus form prominent, slightly overhanging ridges, 

 especially anteriorly. The anterior flagellar pore is found at the proximal junction of the 

 girdle and sulcus, the po.sterior one slightly beyond its distal junction. The transverse flagellum 

 traverses about 0.5 the entire length of the girdle. 



The ocellus is of the concentrated type and is situated in a midventral position on the left 

 side of the sulcus. Its length is 0.45 to 0.60 transdiameter and its main axis is horizontal and 

 directed ventrally in one individual (pi. 8, flg. 89) and vertically with an anterior direction in 

 another (fig. PP, 2). The direction of both is probably affected by the presence of adjacent 

 food bodies. The lens is of the concentrated type, elongated, smooth or slightly lobed in outline, 

 where crowded upon a food mass (flg. PP. 2) of a dull, opaline-green color, and showing faintly 

 outlined concentric layers. The base is more or less deeply imbedded in the large, amoeboid 

 melanosome which at times almost covers it, then retreats, leaving it exposed for nearly its entire 

 length. The central core is large and scarlet red to maroon in color. A few large granules of 

 black or red pigment are found in the peripheral cytoplasm near the girdle. 



The nucleus is large, ellipsoidal, and located in the anterosinistral region. Its major and 

 minor axes are 0.65 and 0.5 transdiameter in length respectively. Distinct parallel, crowded, 

 chromatin strands pass obliquely across its main axis. 



A small, club-shaped pusule opens into the anterior and another into the posterior flagellar 

 pore, each with its apex directed towards the equatorial plane. 



Pouchetia voracis, like many of the Gymnodiniidae, is a voracious feeder. In one individual 

 (fig. PP, 2) the still connected but collapsed theca of a large Peridinium, resemblingr P. crassiprs, 

 was found crowded into the posterasinistral region, and pushing the ocellus against the sulcus. 

 The contents had apparently been digested, leaving only the shell, the plates of wliich were 

 becoming displaced, as though by pressure. These plates still preserved many of their charac- 

 teristic markings, as if unafi'ected by the digestive processes. The whole mass was enclosed in 

 a large food vacuole. Along the ventral side of the body were a row of blue-green peripheral 

 rodlets, all at right angles, or nearly so, to the surface. These rodlets were not present in the 

 other individuals figured (pi. 8, fig. 89), and are evidently correlated with the metabolism 

 ensuing upon digestion. In a second individual small food masses, one ochraceous, were crowded 

 between micleus and ocellus. The cytopla.sm is clear and very finely granular with a few oil 

 drops centrally located. There were no peripheral vacuoles present. 



The color, which is a clear spinel red, is concentrated in a thin peripheral layer, immediately 

 underneath the periplast, leaving the inner protoplasm quite clear. In some cases the border of 

 the girdle shows a narrow, blue-green line. 



A large, thin, hyaline cyst enclosed the individual figured, inside of which was a second, 

 smaller one of the same appearance. These were both ellipsoidal in form and more widely 

 detached anteriorly and ventrally tlian posteriorly and dorsally. The second individual was 



