REPORT ON THE RADIOLARIA. 265 



Dimensions.— Dia^meter of the four shells— (A) OIG, (B) 0-08, (C) Q-O-i, (D) 0-013 ; leiigth of 

 the spines O'OS to 0-04, breadth 0-007. 



Habitat. — Central Pacific, Station 272, depth 2600 fathoms. 



2. Cromyodrymus ahietimis, u. sp. (PI. 30, fig. 6). 



Radial proportion of the four shells = l : 2 : 5 : 11. All four shells with irregular, roundish 

 pores, t-wice to four times as broad as the bars. Radial proportion of the pores in the four shells 

 = 9:3:2:1. Radial spines eighty to one hundred and twenty, about as long as the radius, 

 branched like a pine tree, with six to twelve ramified branches. 



Dimensions. — Diameter of tlie four shells — (A) 0-22, (B) O'l, (C) 0-04, (D) 0-02 ; length of the 

 spines 0-12, breadth 0-006. 



Hahitat. — South-east Pacific (Juan Fernandez), Station 299, surface. 



Subfamily Caryommida/ Haeckel. 

 Arachnosphcerida, Haeckel, 1862, Monogr. d. Radiol., p. 354; Prodromus, 1881, p. 454. 



Definition. — A s t ro s p li a3 ri d a with five or more concentric spherical lattice- 

 shells. 



Genus 107. Caryomriia,^ n. gen. 



Definition. — A r a c h n o s p h ae r i d a with five to six or more concentric spherical 

 lattice-shells ; two inner (intracapsular) medullary and three or more outer (extra- 

 capsular) cortical shells, composed of ordinary lattice-work ; distance between the 

 former and the latter greater than between any other two shells. 



The genus Car-yomma may be regarded as a Cromyomma, in which the number of 

 the cortical shells is increased to three, four, or more. These lie outside the central 

 capsule, whilst two medullary shells lie within it, and are connected with the former by 

 iiumerous radial spines piercing the wall of the capsule. The ordinary lattice-work is 

 not arachnoidal, as in the three following genera. 



1. Caryomma regulare, n. sp. 



Radial proportion of the five shells = 1 : 2 : 6 : 8 : 10. AU five shells with regular, cu'cular pores, 

 twice to three times as broad as the baxs, and gradually increasing in size fi'om the innermost to the 

 outermost shell. Radial beams connecting them twenty, prolonged on the surface into twenty stout, 

 three-sided pyramidal, radial spines, half as long as the radius, regularly disposed. 



Dimmsians. — Diameter of the five shells— (A) 0-25, (B) 0-2, (C) 0-15, (D) O'DS, (E) 0-025. 



Hahitat. — Central Pacific, Station 268, depth 2900 fathoms. 



' Caryommida = Astrosphferida multiplica = Polysphaeria polyacantha. 

 2 Garyomvm = Nut-eye ; xd^vos, ofifix. 

 (ZOOL. CHALU EXP. PART XL. — 1885.) Rr 34 



