

192 bulletin: museum of comparative zoology. 



The sutures are marked by ridges with cross striae or by broad intercalary 

 bands. The longitudinal furrow plate of the hypotheca is long and narrow. 

 The postcingulars have a median rib. The surface of the plates is minutely 

 and regularly reticulate. No pores. 



Chromatophores small, spheroidal. Large central yellowish chromosphere. 



Length, 68 p. ; transdiameter, 59 p. 



Station, 4732. 



i'liis is the type of Murrayella. 



Murrayella spinosa, sp. nov. 



Plate 9, Fig. 57. 



A small species of biconical form with antapical spine resembling Amphidoma. 



Body biconical, epitheca longer than hypotheca, total length 1.4 times the 

 transdiameter. Epitheca conical, its altitude 0.5 of its transdiameter, sides 

 slightly convex. Antapex with short spine with a transverse fin. 



Girdle postraedian, 0.55 of the length from the apex, impressed, without 

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

 own width, most of the displacement occurring in the proximal part of the 

 furrow. Longitudinal furrow on the epitheca only a narrow groove terminating 

 in a pit, on hypotheca two girdle widths in length with marginal lists. 



Plates normal. Suture lines with broad reticulated bands and central seam. 

 Plates finely reticulate with irregular polygons. Four apical plates. A mid- 

 ventral accessory strip in the precingular row. 



Length, 45 p ; transdiameter, 32 p. 



Station, 4732. 



Murrayella punctata (Cleve). 



Steiniella (*) punctata Cleve. 



Plate 9, Fig. 58. 



A small species, variable in size and proportions, biconical in form with 

 median girdle and axis shifted ventrally. 



Body elongated, length 1.55 times the dorso-ventral and 1.7 times the 

 transdiameter. Epitheca and hypotheca subequal. Epitheca conical, its alti- 

 tude 1.8 of its transdiameter, right and left margins straight or concave, base 

 occasionally somewhat flaring, dorsal margin convex, more so than the ventral, 

 apex displaced ventrally, broadly rounded. 



Hypotheca resembling the epitheca, but its ventral face is concave, and the 

 ventrally displaced antapex is more or less acute. 



Girdle relatively wide in small individuals, and narrower in large ones, 

 furrow deeply impressed with slightly salient margins, forming a descending 

 right spiral displaced its own width. The longitudinal furrow is very long, 

 0.75 of the total length of the body. It runs from the girdle to the apex, nar- 

 rowing gradually till at a point half-way to the apex it is continued as a linear 

 channel. Near the middle of the epitheca it is deflected to the right. On the 



