KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 351 



22. Body striate, orange yellow, labile, deeply constricted distortum sp. nov. 



22. No striae 23 



23. Rose color rosaceum sp. nov. 



23. Blue, yellow, or green 24 



2-1. Right lobe of antapex protuberant 25 



24. Antapex symmetrical, rotund 26 



25. Ventral surface arched, 6C/x, oil yellow cavatum sp. nov. 



25. Not arched ventrally, 54/^, yellowish green helix (Pouchet) Lemm. 



2G. Displacement of girdle .82 transdiameter, green convolutum sp. nov. 



26. Displacement less than .82 transdiameter 27 



27. Antapex very rotund, glaucous blue with yellow tinge vinctum sp. nov. 



27. Antapex flattened, pale yellowish green schuetti sp. nov. 



28. Girdle with 3 turns, 40;ii pulchellum Lebour 



28. Girdle with 4 turns, 111/u, augustum sp. nov. 



Cochlodinium archimedes (Poiieliet) Lemm. 



Text figure HH, 17 



Gymnodinium archimedes Pouchet (1883), pp. 51, 52, fig. M; (1885a), pp. 52, 53, pi. 4, 



fig. 41; (1885&), pp. 529, 530; (1887), pp. 94, 95. 

 G. archimedes, Biitschli (1885), pp. 922, 924, 964, 965, 986, pi. 51, fig. 9. 

 G. archimedes, Sehiitt (1895), p. 36. 

 Cochlodinium archimedes, Lemmermann (1899), p. 360. 

 C. archimedes, Paulsen (1908), pp. 103, 104, fig. 142. 



Diagnosis. — A medium sized species with as^amnetrical, ellipsoidal body, 

 its length 2.05 transdiameters ; girdle a descending left spiral of 2.5 ttirns, dis- 

 placed 1.45 transdiameters ; sulcus Avith torsion of at least 1.5 turns ; color, rose. 

 Length, 76/^. Concarneau, France. 



Description'. — The body is ellipsoidal, somewhat constricted by the furrows ; asymmetrically 

 rounded anteriorly, obliquely truncate posteriorly, its length 2.05 transdiameters at the widest 

 part near the middle. The epicone and hypocone are subequal in length, but the hypocone is 

 slightly greater in size. The epicone is small and button-like anterior to the proximal part of 

 the girdle. It has a length from the proximal and distal ends of the girdle of 0.13 and 0.85 

 respectively of the total length of the body. Its distal portion is a broad band, tapering distally 

 and making 1.5 turns around the body. The distal portion of the hypocone is convex ventrally, 

 concave dorsally, and obliquely truncate posteriorly. 



The girdle joins the proximal end of the sulcus about 0.1 of the total Iciigtii of the bod.y from 

 the apex. It sweeps around the body in a descending left spiral course forming an angle of 

 about 30° to 35° with the longitudinal axis of the body. It passes around the body with 2.5 

 turns and meets the distal end of the sulcus about 0.15 of the total length of the body from the 

 antapex. It is relatively wide and deeply impressed. The positions of the flagellar pores were 

 not recorded by Pouchet. 



The sulcus follows the course of the girdle in its posterior descent of 1.5 turns around the 

 body. It is shallow with a width about half that of the girdle, and terminates at its junction 

 with the girdle posteriorly. The anterior invasion of tlie epicone is not figured, but tlie proba- 

 bility of such an extension occurring is suggested by the notch on the dorsal side of the apex, 

 which in other species is usually made by the anterior end of the sulcus. The indentation at 

 the posterior end of the body also suggests its extension in that direction. 



