KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 



447 



of which forms a deeply overliauging lip. It is a shallow channel on the epicene, but becomes 

 more dce]ily embedded as it proceeds posteriorly. This, with the deeply embedded girdle, breaks 

 up the ventral face into three more or less projecting lips, the lower one of which may show a 

 greater protrusion. 



The ocellus is large, about 0.4 tran.stliameter in length, located some distance below the 

 equatorial plane to the left of the sulcus. Its axis is horizontal and it is directed ventrally. 

 The lens is oblong in shape and is composed of four moieties closely joined together, of a clear 

 hyaline material and greeuisli in color, closelj' embedding its base in the large rotund, black, 

 amoeboid melanosome with its lighter central core. The ocellus is of the concentrated or simple 

 type, although the lamination of the lens still shows its origin from separate parts (pi. 11, 

 fig. 119). In two other individuals the lens (fig. QQ) was less .elongated and less distinctly 

 segmented. 



Fig. QQ. Fouchetia maculata sp. uov. Two individuals showing variations in size and shape of lens and 

 in pigmentation. X 710. 



The luicleus in both individuals figured has the elongated, enlarged, somewhat reniform 

 contour characteristic of predivision stages. Its major and minor axes are 0.6 and 0.4 trans- 

 diameter respectively. Fine beaded parallel chromatin strands follow its major axis. In what 

 is apparently the usual vegetative condition its major and minor axes are about 0.5 and 0.3 

 transdiameter respectively. 



A small pink club-shaped pusule opens into the anterior flagellar pore. None was noted at 

 the posterior pore. The cytoplasm is clear and granular, but so filled with colored masses as to 

 give the whole body a dense appearance. In the half of the organism are a niunber. varying 

 from 2 to 6, of long, slender, green rodlets. These are generally placed at right angles to the 

 surface and point toward the center of the body. In the posterior region of tlie individual 

 figured in color (pi. 11, fig. 119) was located a large, rounded, reddish-brown food mass, and 

 many very small green rodlets apparently difl'ering in no way except in size from the larger 

 ones. Tliese radial structures appear to be accumulations of substances along paths in which 

 substances in metabolism are in transit. Small green oil droplets are abundant near the surface. 

 The jn'ripheral layer also contains, abundantly scattered over the entire surface, irregular or 

 spheroidal pigment masses of sooty black color. In one individual observed the peripheral 

 plasma was strewn with this pigment in the form of fine black rods, curved commas, S- and U- 

 shaped figures, and irregular short curves as well as in small grains. While under observation 

 these began to ro\ind up in spherules prior to cytolysis. The general color of the organism is 

 a bluish grey with a reddish-brownish tinge in one ease in the posterior region, evidently due to 

 the solution of the adjacent food mass. 



