310 MEMOIRS OP THE UNIVERSITY OF CALIFORNIA 



covered with longitudinal equidistant lines, apparently equal in number on both epieone and 

 hypocone, about 30 across the ventral face. It is probable that they have more of a spiral 

 course than figured by Meunier. 



Di^kiENSiONS. — Length, 57;"- ; transdiameter, i-ii^ ; axis of nucleus, 22i^. 



OccuEREXCE. — Figured by Meunier (1910) as a rare species from tlie collec- 

 tions made by the Duke of Orleans's Arctic ExjDedition of 1907 from the Arctic 

 Ocean near Nova Zcmbla. 



Syxoxymy. — Originally described by Meunier (1910) as Spirorliuiinri grave, 

 but is transferred by us to Gj/rodinium. 



CoMPAEisoxs. — In the torsion of the body G. grave is nearest to G. intorfnm 

 s]). nov., a non-striate species of similar size and proportions, but mth much 

 more recorded torsion of the sulcus anteriorly. This furrow is not figured by 

 Meunier anterior to the girdle. Otherwise the species is unicpie in the genus 

 in form and torsion. 



We have inverted Meunier 's (1910, pi. 14, fig. 27) figure and have completed, 

 as faint lines crossing the striae, the probable course of the distal end of the 

 girdle to its junction with the sulcus. Our reasons for this change in orientation 

 are the facts that the proximal end of the girdle is usually the best developed 

 region, the distal end the least, in cases of modification in the course of the 

 girdle. In Meunier 's figures the animal is oriented with the proximal end 

 deficient. We turn the figure end for end and thus bring this deficient section 

 to the distal end. 



Gyrodinium herbaceum sp. nov. 



Plate 10, figure 109 ; text figure DD, 6 



Diagnosis. — This is a small species with subovoidal body, its length 2.11 

 transdiameters ; girdle a descending left spiral, displaced one transdiameter; 

 sulcus short above and below junctions with girdle, with a torsion 0.5 turn; 

 surface finely striate; color, deep lichen green. Length, 38/*. Pacific off La 

 Jolla, California, July. 



Descrlptiok. — The body is subovoidal, widest near the middle, its length 2.11 transdiameters 

 at the widest part. In cross-section it is nearly circular. The epieone is exceeded in size by the 

 hypocone, though its greatest length is 0.16 greater than that of the hypocone. The epieone is 

 subeonical (60°) in shape, convex on the left and concave on the right side with a blunt, rounded 

 apex. Its length on the left and dorsal sides is about 0.32 of the total length of the body. Near 

 the right lateral margin of the body its length becomes greater, reaching posteriorly in a slender 

 point on the right side of the .sulcus for about 0.78 of the total length of the body. The hypocone 

 is broader than the epieone, its sides are more convex and the antapex broad and rounded. 



Tlie proximal end of the girdle joins the sulcus at a distance from the apex of 0.32 of the 

 total length of the body. For the first half of its course it passes around the body in a nearly 

 transverse direction, then turns posteriorly in a steeply descending spiral and forms an angle of 

 about 35° with the median longitudinal ]ilane of the l)ody at its junction with the girdle at a 

 distance from the apex of 0.78 of the total length of tiie body. Its displacement is about one 



