EEPORT OX THE EADIOLARIA. 855 



Genus 367. Pantopelta,^ n. gen. 



Definition. — P h r ac t o p e 1 1 i d a with tweut}^ radial spines, each of which is 

 protected by two free external apophj'ses. 



The genns Panto2Jelta differs from all, other Phractopeltida in the development of 

 free protecting apophyses on all twenty radial spines. Only a single specimen of this rare 

 form was seen, and in this all twenty spines exhibited no marked differences in form and 

 .size, but were more or less irregularly developed. 



1. Pantopelta icosaspis, n. sp. (PL 133, fig. 4). 



Apophyses of all twenty radial spines with forked anastomosing branches, forming a more or 

 less irregular cup-like fenestrated shield, pierced by a variable number of pores. Distance of the 

 apophyses from the outer shell equal to half its radius. Pores of the outer shell irregular, roundish, 

 four to six times as broad as those of the inner shell. Kadial spines compressed, sword-shaped, 

 longer than the radius of the shell. 



Dimensions. — Diameter of the outer shell 0'08, of the inner 0'03. 



Habitat. — Antarctic Ocean, Station 157, depth 1950 fathoms. 



Genus 368. Octopelta,- n. gen. 



Definition. — Phractopeltida with twelve simple spines (four equatorial and 

 eight polar), and with eight tropical spines protected by external free apophyses. 



The genus Octo2')elta differs from the other Phracto23eltida in the possession of eight 

 shields or pairs of free apophyses outside the outer lattice-sheU ; the spines bearing 

 these apophyses are the eight tropical spines. The twelve other spines (eight polar and 

 four equatorial) are quite simple, without apophyses. 



1. Octopelta cultella, n. sp. 



Apophyses of the eight tropical spines simple, compressed, knife-shaped, about as long as their 

 distance from the outer shell. On the base of each spine (in the network of the outer -shell) two 

 orthogonal aspinal pores, two to three times as long as the other polygonal pores. 



Dimensions. — Diameter of the outer shell 0-08, of the inner 00.3. 



Habitat. — Tropical Atlantic, Station 338, surface. 



' P«)iioj)(;fta = Shell everywhere with shields; vavrri, irly^Tn. 

 '^ Oct(>pcfta = Shell with eight shields ; Sktu, ictK-m. 



