KOPOID AND SWEZY: UNARMORED DINOFLAGELLATA 213 



Till? girdle is slightly prcinedian in position, meeting the sulcus proximally ahout 0.39 and 

 distally 0.44 of the total length of the body from the apex. It traverses a slightly spiral course 

 which displaces its distal end posteriorly about its ovra width. The furrow is deeply impressed 

 and about 0.05 transdiameter in width. The sulcus begins a short distance below the apex and 

 passes posteriorly to the antapex in an irregular course but with no torsion. It widens to about 

 twice its own width posteriorly. No fiagella or flagellar pores are noted by Schiitt (1895). 



The nucleus is ellipsoidal, and is located in the dor.sal part of the hypoeone. A coarse, 

 chromatin network is figured by Schiitt (1895, pi. 24, fig. 79.,). Its major and minor axes are 

 0.47 and 0.40 transdiameter respectively. A number of oil droplets and food vacuoles are 

 scattered through the cytoplasm, wliieh is also filled with stout, rod-shaped, yellowish brown 

 chromatophores. 



Dimensions. — Length, 118-122^; transdiameter, 58-59/^; dorsoventral diam- 

 eter, 59m ; axes of nucleus, 27/^ and 22/^. 



OccuKEENCE. — Figured hy Schiitt (1895) from the collections of the 

 Plankton Expedition proliably from the IMediterranean at Naples or from 

 the Atlantic. The only other records are those of Karsten (1907) from the 

 collection of the "Valdivia" Deep Sea Exj^edition, from the Indian Ocean, and 

 Mennier (1910) from the Arctic near Spitzbergeu. 



Syxoxymy. — Schiitt (1895) includes in this species two forms which appear 

 to us to be generically separate. His figure 81, plate 25, with its girdle having 

 a displacement of more than one-fifth (0.22) the length of the body, is gener- 

 ically distinct from his figure 79, plate 24, with its girdle displaced 0.06 the 

 length of the body. The former falls within the genus Gyrodinium and to it 

 we assign the new name Gyrodinmm fnlrafinii. 



CoMrAiusoxs. — Schiitt (1895) figures no stirface striae on this species. With 

 its roughly fusiform body it is unique in the subgenus Gymnodininm (serisu 

 strictti), except for G. flum Lebour (1917&). Should striae be found on it the 

 species shoidd be transferred to the subgenus Lineadiniuw, composed of striate 

 species, some of which, such as G. cuchuu's and G. (iiorioii, are fusiform. 



Gymnodinium gleba Schiitt 



Text figure AA, 4 



Gymnodinium yhba Schiitt (1895), pi. 25, fig. 86; (1899), p. 629. 

 G. gleba, Lemmermann (1899), p. 358. 



Diagnosis. — A large species with ellipsoidal body, its length 1.57 transdiam- 

 eter; girdle displaced its own width; sulcus extending from the apex to the 

 antapex. Length, 126.". Atlantic or Mediterranean; Pacific off La JoUa, 

 California. 



Description. — The body is stout ellipsoidal, widest at the middle, its length 1.57 transdiameter 

 at the widest part at the girdle. The epicoue has a length at its left and right sides of 0.5 and 

 0.55 respectively of the total length of the body, exceeding the length of the hypoeone by about 

 0.1 of its own length. It is sjinmetrically rounded with the apex forming a slightly rounded, 

 blunt elevation. The hypoeone is symmetrically rounded, bilobed at the antapex by the sulcal 

 notch. 



