'308 University of California Publications. [Zoolog-j 



Ceratium teres, sp. no v. 



PI. 29, figs. 34-36. 



A minute species related to C. eugrammiim (Ehrbg. '59 and 

 73) but of more delicate habit. It differs from C. eugrammum 

 in its fusiform midbody. The lateral margins of the epitheca are 

 convex and the hypotheca is contracted distally. The antapicals 

 are short, the right diverging 25° to 30°. The postmargin is rela- 

 tively wide and the postobliquity is not so steep as in C. eugram- 

 mum. The thecal wall is hyaline and structureless, and is very 

 delicate on the horns, and comparatively thick on the midbody. 

 Pores very faintly marked, suture lines rarely evident. 



Length, 160-210/x; transdiameter, 33-37/*. 



Eare in oceanic plankton off San Diego. 



Gonyaulax pacifica, sp. no v. 



PL 30, figs. 37-39. 



An elongated species with a single asymmetrical antapical 

 horn and suture lines marked by parallel longitudinal striae. 



Body broadly fusiform, rounded posteriorly and somewhat 

 flattened on the ventral face. Total length nearly twice trans- 

 verse diameter at girdle. Compressed laterally, ratio of tran- 

 sverse and dorso-ventral diameters, 1 to 1.2. Epitheca a cone 

 whose lateral faces are slightly concave and whose altitude is 

 about equal to the diameter of the spreading base. Hypotheca 

 dome-shaped, abruptly rounded posteriorly and flattened and 

 excavated on ventral face, flaring at the girdle. Its altitude about 

 three-fifths of its transdiameter at girdle. The hypotheca is pro- 

 longed at the left of the median line in a stout acute antapical 

 spine about one-seventh of the diameter at the girdle in length. 



Girdle located about five-ninths of the total length from the 

 apex, its plane perpendicular to the axis. Transverse furrow 

 narrow, its width a little more than one-twentieth of the trans- 

 diameter, forming a descending right spiral with displacement 

 nearly twice its width and most of its curvature near the distal 

 end, deeply impressed, Avith sharply angled overhanging margins 

 formed by the flaring bases of the epitheca and hypotheca. Fla- 

 gellar foramina located at the displaced ends of the transverse 

 furrow. The longitudinal furrow was obscured in the specimen, 



