234 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Gymnodinium mirabile Penard 



Text figure X, 18 



Gymnodinium mirabile Penard (1891), pp. 11, 14, 16, 22, 23, 24, 25, 30, 56, pi. 5, figs. 1-7. 



G. mirahilc, Imhof (1892), p. 175. 



G. mirabile, Lemraermann (1900), p. 116; (1902), p. 260; (1910), p. 613, figs. 15-16; pp. 



618, 624. 

 G. mirabile, Levander (1901), p. 6. 

 G. mirabile, Schilling (1913), p. 16, fig. 14. 



DiAGxosis. — IMedium large species with subovoidal body, dorsoyentrally 

 flattened, its length 1.28 transdiameters ; girdle displaced aliout its own width; 

 sulcus short on epicone and extending to antapex ; chromatophores green, yellow 

 or brown. Length, 90/^. Lake Geneva, Switzerland. 



Desckiption. — The body is stout, subovoidal, with broad apices, widest below the middle, its 

 length 1.28 transdiameters at tlie widest part. The epicone exceeds the hypocone in length by 

 about 0.18 its own length. It is carapanulate with broad apex, and a length on the left and right 

 sides of 0.5 and 0.54 respectively of the total length of the body. The hypocone is slightly 

 broader than the epicone, with a broad antapex which is truncate or notched. 



The girdle is slightly behind the median part of the body and is displaced posteriorly about 

 its own width. The furrow is narrow and is deeply impressed with high rounded borders. The 

 sulcus invades the epicone for about half its length and extends posteriorly to the antapex. 



The nucleus is a small, ellipsoidal body in the middle of the hypocone filled with coarse, 

 chromatin strands. Its major and minor axes are about 0.35 and 0.28 transdiameter in length 

 respectively. The peripheral zone of cytoplasm is filled with elongated, rodlike chromatophores, 

 radially arranged, and green, yellow, or brownish in color. 



DiMExsiONS. — Length, 90m ; transdiameter, 65/^ ; axes of miclens, 20/* and 25y". 



Occurrence. — This si:»eeies was figured by Penard (1891) from Lake Geneva, 

 Switzerland. 



RELATiONSHirs. — This species is close to G. nherrinium (Allman), described 

 by Penard (1891) as G. mirabile var. rufcsceus, but differs from it in propor- 

 tions, being a relatively longer form with greater displacement of the girdle. 



Gymnodinium monadicum (Perty) Sa^dlle-Kent 



Text figure BB, 7 



Pcridinium monadicum Perty (1852), p. 162, pi. 7, fig. 15. 

 Gymnodinium monadicum Saville-Kent (1880-82), pp. 443, 444. 



Description. — A minute form with ovoidal to ellipsoidal body, widest anteriorly, with 

 rounded apices. Epicone is much wider than the hypocone with the girdle slightly postmedian. 

 The color is green with a small, red pigment spot. Length, I6/.1. Fresh water from the Bernese 

 Alps, Switzerland. 



Synonymy. — Figured by Perty (1852) as Pendininm monadieu))), it was 

 placed in the genus Gymnodinium, by SaA^lle-Kent (1880-82) as G. monadicum. 

 He considers this identical with G. vorticelli (our fig. X, 29), described by Stein 



