148 MEMOIKS OF THE UNIVERSITY OF CALIFORNIA 



Description. — The body is broadly ellipsoidal in ventral view, narrowly so in side view, with 

 broadly rounded apices, its length 1.5 trausdiameters at the widest part. The epicone is a 

 minute, triangular-shaped portion at the anterior end, its widest part about 0.4 transdiameter 

 of the body, and its greatest length about 0.3 of the total length of the body. The hypocone is 

 broadly rounded, narrowing slightl3' towards both ends. 



The ends of the girdle meet at a point about 0.3 of the total length of the body from the apex. 

 It passes anteriorly at an angle of about 20° from the main axis of the body, turns transversely 

 across the dorsal side and thence posteriorly at an angle of about 25° with the main axis of the 

 body. The furrow is wide and somewhat deeply impressed. The sulcus begins at the junction 

 of the ends of the girdle and passes posteriorly to the antapex. The two flagella arise near each 

 other at the point of junction of girdle and sulcus. 



The nucleus has not been figured for this species by Claparede and Lachmann (1858-61) or 

 by Calkins (1902). The central part of the body usually contains a small spheroidal body. 

 Radiating from this out to the periphery are long chromatophores, yellow brown in color. 



Dimensions. — Length, 40 to 50/^ ; transdiameter, 30m ; dorsoventral diameter, 



OcciTERENCE. — Figured by Claparede and Laelimann (1858-61) from collec- 

 tions made along the coast of Norway. Other records of its occurrence are as 

 follows: Entz (1896) from salt pools near Deva, Hungary, and Cleve (1894) 

 along tlie west coast of Sweden, Calkins ( 1902) at Woods Hole, Mass., ^fassart 

 (1901) in pools and ditches near Palinglu'ug, Belgium, and Griessmann (1913) 

 in laboratory cultures from sea water at Roscoff, France. No figures or de- 

 scriptions are given by Massart and Griessmann; hence the identity of their 

 forms must be held in doubt. 



Amphidinium ovoideum Lemmermann 



Text figure U, 19 



Proroccntriim ovmdcuni Lemmermann (18966), p. 147, figs. 1-3; as Amphidinium ovoi- 

 deum, (1900), p. 115; (1902), p. 260; (1910), p. 616, fig. 

 Amphidinium ovoideum, Paulsen (1908), p. 96. 

 A. ovoideum, Klebs (1932), p. 438. 



Diagnosis. — A minute species with broad, oval body, its length 1.25 trans- 

 diameters ; girdle far anterior ; sulcus ( ?) ; bro^vn chromatophores. Length, 

 23/^. Brackish water, near Baltic Sea, Germany. 



Description. — The body is broadly oval to rounded, with broad apices, its length 1.25 trans- 

 diameters at the widest part. The epicone is minute, its length from the distal border of the 

 girdle, 0.12 of the total length of the body and its greatest width 0.38 transdiameter. The apex 

 is broadly rounded. The hypocone is symmetrical, tapering at both ends, with broad, round 

 antapex. 



Lemmermann 's figures (1896?)) give only what is apparently the dorsal side, hence the 

 complete course of the girdle and the sulcus cannot be traced. The girdle passes transversely 

 across the dorsal side at a distance from the apex of 0.12 of the total length of the body. 



The nucleus is a spheroidal body found near the antapex. Its axis is about 0.38 transdiameter 

 in length. The body is filled with closely crowded, spherical, brown chromatophores. No striae 

 are recorded. 



