KOFOID : NEW SPECIES OF DINOFLAGELLATES. 195 



Phalacroma reticulata, sp. no v. 



Plate 13, Fig. 73. 



A small species of biconical form, laterally compressed, with very coarse 

 reticulations. 



The length is 1.6 times the transdiameter, and 1.25 times the dorso-ventral. 

 The epitheca is a low symmetrical cone, laterally compressed, its altitude 0.48 

 of its dorso-ventral diameter and 0.57 of its transdiameter. Its sides are 

 straight and the apex is broadly rounded. 



The hypotheca is a high cone, its altitude a trifle less than its transdiameter 

 and 0.8 of its dorso-ventral. Its ventral margin is convex in the middle, the 

 dorsal nearly straight and the laterals a little concave. The antapex is 

 rounded. 



The girdle is 0.4 of the length from the apex and has low hyaline lists. 

 The left ventral list is high, with a single prominent rib and several secondary 

 ones. It is decurrent posteriorly and is continued around the hypotheca on 

 the right side of the suture to the dorsal girdle, as a low list. 



The surface is coarsely reticulate, with 24 polygons on the epithecal valve 

 and 36 on the hypotheca!. 



Length, 100 fi ; transdiameter, 64 /u. 



Station, 4740. 



Phalacroma striata, sp. nov. 



Plate 13, Fig. 73. 



A large species resembling P. cuneus, but differing in the form of antapex. 

 In P. cuneus this is symmetrically contracted to a rounded antapex. In P. 

 striata the hypotheca is relatively larger, is broadly rounded at the antapex 

 and more expanded ventrally. The ventral margin is nearly straight, and 

 forms a right angle with the girdle. The left ventral fin follows the outline 

 of the body or even exaggerates the ventral expansion, and reaches the level 

 of the antapex. It is faintly radially striate. Girdle with wide membranous 

 lists. 



Thecal wall reticulate, with coarse polygons each with central pore. 



Length, 120 /x; dorso-ventral diameter in girdle, 120 /x. 



Stations, 4638, 4719. 



Phalacroma ultima, sp. nov. 



Plate 13, Fig. 68. 



A bizarre species of small size with bifurcated antapex and longitudinal 

 furrow displaced to the right. 



The length of the body is 1.6 times the greatest dorso-ventral extension, 

 and 4 times the transdiameter (excluding the collars). The epitheca is low, 

 its greatest altitude above the furrow is 0.35 of its dorso-ventral diameter. It 

 is highest in the ventral third and declines rapidly dorsally. 



