REPORT ON THE RADIOLARIA. 1755 



3. Ccelospathis octodactyla, n. sp. (PI. 128, fig. 9). 



Shell-mantle about as long as broad, in the frontal perimeter nearly isosceles triangular, very 

 similar to the two preceding species ; it differs from them in the following characters : all eight 

 styles have nearly equal size, and each bears six to eight pairs of branches. The eight fingers of 

 the terminal coronets diverge nearly in one plane, and are not curved in a zigzag manner, but armed 

 with alternate, slender, recurved hooks, which are larger than in the two preceding species, and 

 geniculate at the base ; the distal end of each finger bears a verticil of eight to ten very small 

 divergent teeth, which are not recurved (fig. 9). 



Dimensions. Length of the shell 24, breadth 2'2. 



Habitat. North Pacific, Station 252, surface. 



Genus 736. Ccelodecas,^ n. gen. 



Definition. C celographida with an odd sagittal frenulum on each galea and 

 an outer lattice-mantle, armed with ten styles (one odd and four paired styles on each 

 valve). 



The genus Ccelodecas is closely allied to Ccelographis, but differs from it in the 

 development of a new pair of styles on each valve. These are placed between the odd 

 nasal and the paired tergal styles, are usually directed laterally, parallel to the frontal 

 axis of the body, and may therefore be called frontal or lateral styles. The total 

 number of coronal styles is therefore ten. 



1. Ccelodecas sagittaria, n. sp. (PI. 126, figs. 2a, 26). 



Shell-mantle one and a half times as long as broad ; its frontal perimeter pentagonal, with a 

 deep median incision at the base ; the two oral sides of the pentagon twice as long as the two 

 lateral sides, and one and a half times as long as the base. Sagittal perimeter ovate ; equatorial 

 perimeter subcircular. Nasal odd style of each valve with fourteen to sixteen pairs of branches, 

 one and a half times as long as the paired frontal styles (each with eight to nine pairs), and twice 

 as long as the paired tergal styles (each with four to six pairs of branches). Terminal coronets (on 

 the free distal ends of the styles) richly branched, each with thirty to forty thorny fingers, which 

 bear a conical point with recurved teeth, like an arrow. 



Dimensions. Length of the shell 3'2, breadth 21. 



Habitat. Tropical Atlantic, Station 347, depth 2250 fathoms. 



3. Ccelodecas decastyla, n. sp. 



Shell-mantle one and a third times as long as broad ; its frontal perimeter pentagonal, with a 

 slight incision on the base ; the two oral sides of the pentagon as long as the base, and one and a 



1 Ccelodecas = Shell with ten hollow styles; xo<Xo?, 



