460 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



OccuKRENCE. — One iBdividual was taken from the surface haul made -with 

 a No. 12 silk net at the end of the pier at the Biological Station at La Jolla, 

 California, on June 7, 1917, in surface temperature of 17-3 C, and the other 

 from a haul made 4 miles offshore with a No. 25 silk net on July 11, 1917, from 

 a depth of 80 meters to the surface and in a surface temperatvu-e of 19?7 C. 



CoMPAEisoNS. — The purplish color of the plasma somewhat resembles that 

 of P. purpurata and Gyrodinium postmaculatum, although the species P. pur- 

 jmrescens has little else in common with either of these species. P. fusus is the 

 only species equaling it in the amount of torsion (2 turns) of the girdle and 

 sulcus combined. The location of the ocellus at the right of the sulcus instead 

 of the left is unparalleled in the genus PoucJietia. This species was particu- 

 larly puzzling and difficult to interpret because of the uncertainties in following 

 the girdle and sulcus. There is here a possibility of a mistaken interpretation. 

 Assuming a correct interpretation, it appears that the ocellus has been crowded 

 from an internal position at the left side of the posterior part of the inter- 

 cingular sulcus to the right side without very marked change in either position 

 or direction of its axis. This might be due to the crowding of food balls ejected 

 before encystment. The location of the ocellus was the same in a second encysted 

 individual, but its axis was turned anteriorly 45°. Since we have little evidence 

 that the ocellus is subject to marked changes in position in the c;^i:oplasm the 

 suggestion that this ocellus has been shifted by pressure into an unusual position 

 from the normal and expected one must be regarded as tentative. 



This species is a moderately specialized member of the subgenus PouchetielJa 

 with integrated lens, as shown by the small and variable ocellus, high coloration, 

 and extreme torsion of the girdle and sulcus. 



Pouchetia rosea (Pouchet) emend. 

 Text figure 00, 4 



Gymnodiniiim polyphemiis var. i-oseum Pouehet (1897), pp. 93, 96-97, 112, pi. 10. fig. 1. 



Not Pouchetia rosea, Schiitt (1895), pp. 94, 95, pi. 26, fig. 92 (^P. schuetti nom. sp. 

 nov.). 



P. rosea, Lemmermann (1899), p. 360. In part, includes P. schuetti. 



P. rosea, Schroder (1900), p. 14. Based on Schiitt 's figures (1895) (=P. schuetti). 



P. rosea, Pavillard (1905), p. 48, pi. 3, fig. 4. Schiitt "s P. rosea (1895) regarded as 

 problematical. 



P. rosea, Paulsen (1907), p. 24; (1908), pp. 105, 106, fig. 146. In part, tentative inclu- 

 sion of Schiitt 's P. rosea (1895). 



P. rosea, Ostenfeld (1913), pp. 338, 358, 476. Allocation indeterminable. 



Not Gymnodinium roseum, Dogiel (1906), pp. 20-26, pi. 2, figs. 26-37 {^= Chytriodinium 

 roseum (Dogiel) Chatton (1912), pp. 91-92). 



Not Gymnodinium roseum, Lohmann (1908), pp. 202, 252, 366, 368, tab. B, pi. 17, figs. 

 24-28 (=(?. lohmanni Paulsen (1908), p. 99, figs. 137 A-D). 



