KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 383 



surface is minutely striate with closely set, equidistant striae, approximately equal in number 

 on both epicone and hypoeone and apparently about 60 across one face. In his figure 72, j)late 

 22, Sehiitt (1895) shows a portion of an indi\adual fixed with Plemming's solution and stained 

 with haeraotoxylin, from the posterior end of which stream long, pseudopodia-like strands of 

 protoplasm. These did not appear in the living animal, but required staining to make them 

 visible. They apparently have no definite place of origin and are probably artifacts, sucli as 

 are frequently found in stained material. 



Dimensions. — Length, 198^; transdiameter, 110/*; axis of nucleus, 54;^. 



Occurrence. — Figured by Scliiitt (1895) from material collected l)y the 

 Plankton Expedition, presumably from the Bay of Naples or the Atlantic. 



Synonymy. — This species was first described by Schiitt (1895) as Gymno- 

 dinium stramjuJatum, and later (1896) changed by him to Coeldodinium as the 

 type and only species of the genus when described. It is also the type sjDecies 

 of the subgenus Coeldodinium. 



Comparisons. — This is one of the largest species in the genus, being exceeded 

 in size by only one species, G. minatum. It shares with this species the pecu- 

 liarity of having a perinuclear, hyaline zone, as well as a striate surface, but 

 differs from it in the absence of red pigment, shape of the body, and in having 

 a hemispherical instead of a pointed apex. The species is otherwise quite 

 isolated in the genus. 



Cochlodinium turbineum sp. nov. 



Plate 'J, figure 99 ; text figure GG, 9 



Diagnosis. — This is a minute species with broad, obovoidal body, its length 

 1.04 transdiametcrs; girdle a descending left spiral of 1.5 turns, displaced 0.56 

 tratis<liameter ; sulcus with short apical loop and total torsion of 0.5 turn ; color, 

 yellowish green. Length, 26/*. Pacific otf La Jolla, California, July, August. 



Description.- — The body is broadly obovoidal in outline, circular in cross-section, its length 

 1.04 transdiametcrs at the widest part about the middle of the body. The anterior part of the 

 body is rotund, tapering posterioiiy with the ventral face deeply constricted by the intercingular 

 sulcus. The epicone greatly exceeds the hypoeone in size, its length and transdiameter being 

 greater. It is broadly rounded anteriorly with a length from the proximal and distal ends of 

 the girdle of 0.31 and 0.88 respectively of the total lengtli of the body. Its distal portion 

 becomes drawn out to a slender point. The length of the hypoeone posterior to the distal 

 junction of the girdle and sulcus is about 0.05 of the total length of the body. The antapex is 

 notched by the distal end of the sulcus. 



The distance of tlie proximal and distal ends of the girdle from llie apex is about 0.31 and 

 0.88 respectively of the total length of the body. In the first 0.8 transdiameter of its course 

 the rotundity of the body throws it somewhat anteriorly, beyond which it turns posteriorly at 

 an angle of 30° to 40° with the transverse plane on the left side of the body, traversing the 

 right in a nearly transverse direction with another shoi't posterior deflection to meet the sulcus. 

 The furrow has a width of about 0.05 transdiameter and is deeply impressed. The anterior 

 flagellar pore is located at the anterior junction of the girdle and sulcus and the posterior pore 

 at the posterior junction. 



