KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 



477 



melanin. The torsion of the body, as shown by the course of the sulcus, is only 

 0.2 turn, far less than in any species of Pouchetia, and thus more like that of 

 Erijtliropsis The stout longitudinal flagellum recalls that figured by Schiitt 

 (1895) for Pouchetia cornuta (=Eryt]iropsis cornuta). 



ERYTHROPSIS Hertwig 



Plate 12, text figures RR-VV 



"Aeineten" Metelmikoff (1872), pp. 7-9; (1885), p. 433. 



Erylhropsis Hertwig (1884), pp. 204-212, pi. 6. 



Spastostyla, Vogt (1885a), in part, p. 53; (1885b), pp. 183-187, fig. 1. 



Pouchetia, Schiitt (1895), in part, pi. 26, figs. 95, 96. 



Erylhropsis, Delage and Herouard (1904), pp. 387-388, figs. 680, 681. 



Diagnosis 



Gyranodinioidae with flattened epicone less than 0.25 the size of the hypo- 

 cone, flattened anteriorly and with or without a small curved apical horn. 

 Ocellus very large, composed of one or several hyaline lenses attached to or 



post, p 

 tent. rec. 



tent. rec. 



Fig. RR. 1. Erythropsis cornuta (SchUtt). 2. E. scarlatina sp. nov. Abbreviations: ant. p., autapical pore; 

 up. h., apical horn; ap. I., apical loop; core, core of melanosome; epi., epicone; fur., furrow; gir., girdle; hyp., 

 hypooone; (., lens; mel., melanosome; n., nucleus; o., ocellus; pig., pigment; post, p., posterior pore; post. par. I., 

 postcingular paradinial lines; pre. par. L, precingular paradinial lines; prod, prod or tentacle; piis., pusule; 

 retrac. fib., retractor fibrillae; sulc, sulcus; sty., stylet; tait. rec, recess of prod or tentacle; tr. fl., transverse 

 flagellum. X 500. 



imbedded in the side of a red, brownish or black pigment body with a red, 

 brown, or yellow core, located to the left of the intercingulav sulcus. Tlie girdle 

 makes a single, descending sinistral turn and may be bordered by the prec^iug- 

 ular and postcingular grooves which we designate as the paracingular grooves 

 or lines. The sulcus expands posteriorly into a ventroposterior tentacular 

 recess from the center of which springs a posteroventrally or posteriorly 



