REPORT ON THE RADIOLARIA. 1221 



wings or solid spines arising from the collar stricture, and freely prominent between the 

 horned cephalis and the flat conical thorax. 



The genus Eucecryphalus, according to the restricted definition here given, com- 

 prises only those Sethopilida in which the three primary cortinar beams are perfectly 

 free divergent collar wings, i.e., free spines arising outside the shell from the collar 

 stricture, between the cephalis and thorax. The type of this genus (which I formerly 

 united with other Sethopilida) remains Eucecryphalus gegenbauri. 



Subgenus 1. Eucyrtomphalus, Haeckel, 1881, Prodromus, p. 431. 



Definition. Peristome or margin of the ba*al mouth of the thorax smooth, without 

 marginal spines. 



1. Eucecryphalus corocalyptra, n. sp. 



Shell flatly conical, with slight collar stricture. Length of the two joints =1:3, breadth = 1:6. 

 Cephalis subspherical, with an oblique conical horn twice its length. Thorax conical, twice as 

 broad as long, with regular hexagonal meshes and straight lateral outlines. From the collar stricture 

 there arise three slender conical spines, about as long as the thorax, divergent downwards. Similar 

 to Corocalyptra, agnescc (PL 59, fig. 3), but without lumbar stricture and abdomen. Peristome or 

 basal margin of the mouth of the thorax smooth, simple. 



dimensions. Cephalis 0'03 diameter; thorax 0'09 long, 018 broad. 



Habitat. Cosmopolitan ; Atlantic, Indian, Pacific, surface. 



2. Eucecryphalus halicalyptra, n. sp. 



Shell flat, campanulate, with distinct collar stricture. Length of the two joints = 1 : 4, breadth 

 = 2 : 10. Cephalis hemispherical, with two divergent conical horns, a major occipital and a minor 

 frontal horn. Thorax with subregular hexagonal meshea and concavo-convex lateral outlines, cam- 

 panulate. From the collar stricture there arise three divergent bristle-shaped spines, nearly horizontal, 

 about half as long as the thorax. Peristome smooth, with a marginal coronal of small square 

 pores. 



Dimtnsions.-Z-Gephalis 0'02 long, 0'04 broad ; thorax 0'08 long, 0'2 broad. 



Habitat. Central Pacific, Stations 266 to 274, surface. 



Subgenus 2. Eucecryphalium, Haeckel. 



Definition. Peristome or margin of the basal mouth of the thorax dentate, with' 

 a coronal of marginal spines. 



