KOFOID : NEW SPECIES OF DINOFLAGELLATES. 191 



equals the dorso- ventral. The greatest diameter is a short distance posterior 

 to the girdle. The epitheca is a small hemisphere with a short, stout, apical 

 horn with blunt apex. The apical horn emerges very abruptly from the dome 

 of the epitheca. The altitude of the epitheca above the girdle is 0.5 of its 

 transdiameter, which in turn is 0.5 of the greatest transdiameter of the hy- 

 potheca, and about 0.16 of the total length. 



The hypotheca is top-shaped, abruptly rounded to the girdle, tapering reg- 

 ularly posteriorly to an acute point. 



The girdle is peculiar, very wide, its width 0.12 of the total length, and 

 slightly exceeding the altitude of the epitheca. It is constricted to an acute- 

 angled furrow at its middle, and extends anteriorly on the capitate epitheca 

 and posteriorly upon the expanding hypotheca. Its margins are marked by 

 faint lines with a prominent line of pores, especially in the hypotheca, where a 

 low hyaline list also occurs. The list on the hypotheca is very low. 



Plates normal, scarcely defined on epitheca, apical horn not separable, ant- 

 apical also apparently fused. The surface faintly marked with punctate lon- 

 gitudinal striae. 



Length, 50 ft ; transdiameter, 22 /a. 



Station, 4734. 



MURRAYELLA, gen. nov. 



Oxytoxinae with spheroidal body and medium girdle, epitheca and hypo- 

 theca nearly equal. Transverse furrow impressed, forming a descending right 

 spiral with more or less displacement. Longitudinal furrow on both epitheca 

 and hypotheca but not reaching the apex or antapex. Theca composed of 

 discrete plates. Epitheca with 6 precingulars and 2-4 apicals and a small mid- 

 ventral intercalary next to the longitudinal furrow. No apical pore. Hypo- 

 theca composed of 5 postcingulars one of which is the longitudinal furrow 

 plate, and an antapical apparently of one spine-like plate. Plates ribbed and 

 reticulate. Chromatophores yellowish. 



Geratium biconicum Murr. et Whitt. and Steiniella (?) punctata Cleve 

 belong in this genus. 



Murrayella globosa, sp. nov. 



Plate 9, Fig. 56. 



A small globose species with epitheca equalling the hypotheca. Epitheca 

 conical, its altitude 0.6 of a transdiameter. Apex rounded or with small acute 

 point. Hypotheca hemispherical with short acute terminal spine deflected to 

 the right. Left side somewhat more convex than the right. Girdle median, 

 displaced distally its own width. Furrow deeply impressed, without lists or 

 salient ridge, sparingly ribbed. Longitudinal furrow greatly widened on the 

 epitheca, reaching 0.4 of the diameter to the apex and its width nearly equal- 

 ling its height. Posteriorly the longitudinal furrow is narrow and not so 

 expanded at the end as on the epitheca. 



