REPORT ON THE RADIOLARIA. 833 



2. Echinaspis diadema, u. sp. 



Eadial spines thin and long, i|nadrangular, prismatic ; outer half two to three times as louii' 

 as the inner. Four apophyses of each spine simply forked (or partly with bifid fork-branches) ; 

 each spine with eight to twelve sutural condyles. Meshes of the shell fifteen to twenty-five times 

 as broad as the bars. Each condyle bears a simple bristle-shaped by-spine, nearly as long as 

 the radius. 



Dimensions. — Diameter of the shell Oil ; breadth of tlie spines and bars 0-002. 



Hah'dut. — South Atlantic, Station 333, surface. 



3. EcJunas2)is echinoides, n. sp. (PI. 137, figs. 7, 8). 



Eadial spines roundish, in the outer half conical, and two to three times as broad as in the 

 inner half. Four apophyses of each spine doubly forked or dichotomously (more or less 

 irregularly) branched ; each spine with sixteen to twenty-four sutural condyles. Meshes of the 

 shell four to eight times as broad as the bars. Each condyle bears a zigzag by-spine, one- 

 third as long as the radius. 



Dimensions. — Diameter of the shell O'lS ; breadtli of the spines 0-004 to 0-01, of the 

 bars 0-002. 



Habitat. — Central I'acific, Station 266, surface. 



Genus 360. Zonaspis,'^ u. geu. 



Definition. — D u r a t a s p i d a with four plates, each of which is perforated l>y four 

 crossed aspinal pores ; these four phxtes are formed by the united branches of the 

 apophyses of the four equatorial spines. The branches of the apophyses of the sixteen 

 other spines (eight polar and eight tropical) form no lattice-plates hy union. Each 

 condyle bears a by-spine. 



The genus Zonaspis differs from all other Dorataspida in the peculiar forumtion of 

 the four equatorial spines, which form by union of the recurved branches of their 

 apophyses four perforated plates (each with four crossed pores), whilst the branches of 

 the sixteen other plates do not unite to form plates, l)ut simply meet the branches of 

 the neighbouring spines. 



1. Zonaspis franilis, n. sp. 



Eadial spines very thin and long, cylindrical. Four meshes of each equatorial plate pentagonal, 

 ten to twelve times as broad as the bars. By-spines zig-zag, nearly as long as the radius. 

 Bitnensions. — Diameter of the shell 0-16, of the parmal pores 0-018. 

 Habitat. — South Atlantic, Station 332, surface. 



1 Zonaspis = Shell with a girdle of .shields ; ^uvn, aavi';. 

 (ZOOL. CHALL. EXP. — PART XL. 188.5.) Er 105 



