364 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



The nucleus shown in the individual in figure 115, plate 10, has the elongated, curved form 

 of tlie predivision stage. It fills nearly the entire dorsoventral part of the body with a length 

 of about 0.7 of the total length of the body. Other individuals possessed ellipsoidal nuclei with 

 major and minor axes of about 0.6 and 0.5 transdiameter respectively. 



Long club-shaped pusules open into either or both flagellar pores or they may be connected 

 at their extremities, forming a complete channel between the two openings. The cji:oplasm is 

 clear and transparent and usually contains numerous blue-green spherules in the peripheral 

 zone. Food bodies, grey, yellow or yellow green in color are generally present in the cytoplasm, 

 indicating a holozoic type of nutrition. The general color is grey or greenish with a tinge of 

 yellow ochre near the apices. A thin hyaline cyst often encloses the organism. 



DiMENSioxs. — Lengtli, 49-72/^; transdiameter, 3J— 40/^; axes of nucleus, 16/* 

 and 13," ; length of cyst, 88/*. 



Occurrence. — This was first observed in a surface haul made near the 

 Biological Station at La Jolla, California, July 27, 1914. It was again taken 

 in 1917, in hauls made July 20 and 23, 6 miles off La Jolla, from 80 meters to 

 the surface and in surface temperatures of 21° and 20°1 C respectively, and 

 on August 6, 4 miles offshore, from 60 meters to the surface and a surface 

 temperature of 21°1 C. 



CoiMPARisoxs. — This sjDecies exhibits the same mobility of its posteroventral 

 surface as is foimd in C. cavatinn (fig. T, 1), and in Pouchetia, as in P. macu- 

 lafa (fig. T, 2), forming part of an orthogenetic line of evolution culminating 

 in Proterytliropsis crassicaiidata (fig. T, 3) and in Eri/tliropsis (fig. T, 4), 

 wliere this region is prolonged into a well developed prod, or tentacle. It be- 

 longs in the subgenus Glyphodinmm, near C. schuetti nom. sp. nov. (fig. HH, 2) 

 and C. helix (Pouchet) Lemm. (fig. HH, 8), differing from both in its greater 

 develo]Hneut of the apical loop of the sitlcus and more deeply notched antapex. 



Cochlodinium distortum sp. nov. 

 Plate 7, figure 78 ; text figure HH, 9 



Diagnosis. — Very large sj)ecies, with labile body deeply concave ventrally, 

 with subequal anterior, median and posterior lobes, apices broadly rounded; 

 girdle a descending left spiral of nearly 1.5 turns, displaced at least 0.42 total 

 length of body; sulcus with about 0.5 turn (morphological) ; mtcleus anterior; 

 sin-face striae beaded with orange. Length, 155/^. Pacific off La Jolla, Cali- 

 fornia, July. 



Description. — The bodj' is profoundly distorted by constrictions which mark off three sub- 

 equal anterior, median, and posterior lobes and by a deep ventral concavity and dorsal arching 

 of the median lobe, so that the body has the form of a three-lobed kidney. The three lobes are 

 about equal in volume and in diameter, except that the median lobe is somewhat narrower and 

 longer than the others and deficient ventrally ; the posterior lobe is perhaps a trifle the largest. 

 The body is also twisted in the direction of the usual torsion of the sulcus, thus adding to the 

 difficulty of interpretation. Its length is 2.25 transdiameters measured across the terminal lobes 

 which are equal in this dimension. 



