REPORT ON THE RADIOLARIA. 815 



same size as the sutural meshes. Radial spines cyhiidrieal ; their outer half on the pointed 

 distal end two-edged and longer than the inner half. 



Dimensions. — Diameter of the shell 014, of its meshes 0"008 to 0'016. 



Habitat. — Mediterranean (Messina), North Atlantic (Canary Islands), Azores, surface. 



5. Dorataspis typica, n. sp. (PI. 138, figs. 4, 4a), 



Shell witli fifty-four crest-like sutures and fifty-four circular sutural meshes, with eiglit 

 hexagonal and twelve pentagonal plates. Both aspinal meshes of each plate elliptical, twice to 

 three times as broad as the sutural meshes. Aspinal meshes of the four equatorial plates twice 

 as broad as those of the sixteen other plates. The meshes are surrounded by elevated and 

 denticulated crests (incipient spine-sheaths). Radial spines compressed, more or less two-edged ; 

 outer pointed half somewhat larger than the inner half. (In this typical species the 

 composition of the shell prevailing in the majority of Ceriaspida is very clear.) 



Dimensions. — Diameter of the shell 0'15 to 018, of the aspinal pores 0'02 to 0'03, of the 

 sutural pores O'Ol. 



Haiitat. — Central Pacific, Stations 270 to 274, surface and in various depths. 



6. Dorataspis micropora, n. sp. (PI. 138, fig. 3). 



Shell with fifty-four sutures and fifty-four very small sutural meshes, with eight hexagonal 

 and twelve pentagonal plates. Both aspinal meshes of each plate elliptical, four to six times 

 as broad as the sutural meshes. Radial spines in the outer half conical, somewhat shorter than 

 in the inner cylindrical half. 



Dimensions. — Diameter of the shell Oil, of the aspinal pores 001 to 0^02, of the sutural 

 pores 0-003. 



Habitat. — North Pacific, Station 244, depth 2900 fathoms. 



7. Dorataspis gladiata, n. sp. 



Shell with fifty-four sutures and one hundred to one hundred and twenty sutural meshes, 

 with eight hexagonal and twelve pentagonal plates. Both aspinal meshes elliptical, three times 

 as broad as the small sutural meshes ; commonly two meshes in each suture. Radial spines 

 sword-shaped, two-edged, tapering from the shell towards the two ends. (Resembles L'elonaspis 

 datura, PI. 139, fig. 9, but differs in the spherical shell, the equal size of the four equatorial 

 spines, and the absence of by-spines.) 



Dimensions. — Diameter of the shell 012, of the aspinal pores 0'012, of the sutural pores 0'004. 



Habitat. — Indian Ocean (Madagascar), Rabbe, surface. 



8. Doratasjjis polypora, n. sp. 



Shell with fifty-four sutures and one hundred and sixty to two hundred sutural meshes, with 

 eight hexagonal and twelve pentagonal plates. Commonly three meshes (sometimes four) on 



