224 MEMOIRS OP THE UNIVERSITY OP CALIPORNIA 



Dimensions. — Length, 52a'; transdiameter, 52/*; axes of nucleus, 30/* and 18/*. 



Occurrence. — One individual was taken August 21, 1917, with a No. 25 silk 

 net, 5 miles off La Jolla, California, in a haul from 85 meters to the surface. 



Comparisons. — In size, shape, proportions, and sidcal notch this species is 

 very similar to G. suJcatnm sp. nov. (fig. X, 1), hi;t differs from it in the entire 

 absence of the rose red color and of the scattered striae on the h\"iDocone. Its 

 sulcus is oblique and its girdle is rather widely displaced, while that of G. 

 sulcatum is without displacement. 



Gymnodinium inerme (Schmarda) Sa^dlle-Kent 



Text figure BB, 15 



Peridinium inerme Sehmarde (1854), p. 10, pi. 1, fig. 8. 

 Gymnodinium inerme, Saville-Kent (1880-82), p. 444, pi. 25, fig. 54. 



Description. — A minute species with ellipsoidal body, its length 1.14 transdiameters. The 

 epicene and hypoeone are equal in size with the girdle occupying the midplane of the body. 

 No sulcal notch. The color is red. Length, IG/jl. Egypt, March, in fresh water. 



Synonymy. — This minute form was figured by Schmarda (1854) as Peridi- 

 nium inerme and the name changed by Saville-Kent (1880-82) to Gymnodinium 

 inerme. Schmarda 's figures lack nucleus, sulcus and the location of the girdle 

 on the ventral face of the organism, i.e., it lacks sufficient morphological char- 

 acteristics to establish it as a valid species. It is, therefore, placed among the 

 species incertae sedis. 



Gymnodinium lachmanni Saville-Kent 



Text figures BB, 4, 6 



Peridinium sp. Claparede and Lachmann (1858-61), pp. 71, 73, pi. 13, figs. 21, 22. 

 Gymnodinium lachmanni, Saville-Kent (1880-82), p. 444, pi. 25, figs. 58, 59. 



Saville-Kent (1880-82) has given this name to two forms figured as two 

 different, unnamed species of Peridinium from the coast of Norway by 

 Claparede and Lachmann (1858-61). The two organisms differ greatly from 

 each other, with no indications of near relationship. They, likewise, may be, 

 in part (our fig. B, 4), Peridinium which have escaped from the shells, as some- 

 times happens, or they may be Gijmnodinium. Until they have been redis- 

 covered, however, they must be iilaced among the species incertne sedis. The 

 one (our fig. BB, 4) ai^pears to be a rounding-up individual of a species near 

 G. marinmn Saville-Kent, approaching cytolysis, and the other might ])e an 

 obliquely lateral view of a small individual of our own species, G. dogieli (fig. 

 Z, 1, 2), assuming that Claparede and Laclnnann have given correct magnifi- 

 cations of their figure. 



