190 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



of uniform width, its length 0.15 of the total length of the body. It extends 

 from the proximal end of the transverse furrow posteriorly to a girdle width 

 beyond its distal end. The flagellar pore lies near the proximal end. 



Pre- and postcingular plates normal, sutures indistinct in apex and antapex, 

 but each composed of several plates. 



Thecal wall marked by equidistant striae containing regularly spaced pores. 

 The striae along sutures somewhat heavier than the 2-3 intermediate ones on 

 each plate. Striae are interrupted at the transverse sutures between the cing- 

 ular and the terminal plates. 



Length, 267 ft ; ti-ansdiameter, 55 /jl. 



Station, 4732. 



Probably Steiniella mitra Schiitt ^ belongs in Oxytoxum. 



Oxytoxum subulatum, sp. nov. 



Plate 10, Fig. 63. 



A large species of slender habit, elongated form, with abruptly contracted 

 epitheca and long subulate apex. 



The body is greatly elongated, its length 5-6 times the transdiameter and 

 4.5-5 times the dorso-ventral. There is little lateral compression. The 

 epitheca is 0.9 of the length of the hypotheca. The epitheca is trumpet shaped 

 with low abruptly contracted basal part and slender linear apical horn with 

 sharp asymmetrical apex shaped like the point of a cannula with the excavation 

 upon the right side, the relative length of the three parts, flaring base, horn 

 and point, are respectively 0.18, 0.58, and 0.24 of the altitude of the epitheca, 

 which is 2.3 times its transdiameter. The horn is set somewhat to the ventral 

 side of the epitheca. 



The hypotheca is almost conical, slightly gibbons just below the girdle, more 

 on the ventral than on the dorsal side, contracted as it passes into the slender 

 attenuate antapex. Its altitude is 2.8-3.2 times its transdiameter at the girdle. 

 The antapical horn is slender, straight, its length a little less than 0.5 trans- 

 diameters. 



The girdle is nearly horizontal, the furrow very deeply impressed with thin, 

 slightly salient ridges, forming a descending right spiral displaced 0.5 of its 

 width. 



Apical region formed of 4 slender plates, antapical fused. Thecal wall with 

 10-12 longitudinal striae. Surface with minute areoles. 



Length, 124-142 /x; transdiameter, 21-27 fi. 



Stations, 4698, 4699. 



Oxytoxum turbo, sp. nov. 



Plate 10, Fig. 60. 



A minute elongated top-shaped species with capitate epitheca. 



Body elongated, its length 2.3 times the greatest transverse diameter, which 



1 Schiitt, F. Die Peridineen der Plankton Expedition. Taf. 7, Fig. 27, 1895. 



