EEPORT ON THE RADIOLARIA. 113 



diflferent numbers of the tubuli : — Disolenia with two tubes, Trisolenia with three 

 tubes, Tetrasolenia with four tubes, Pentasolenia with five tubes, Polysolenia with 

 six or more tubes. All these five genera are without value, as those difi"erent 

 numbers of tubes occur frequently intermingled in the individual cells of one and the 

 same colony, wherever the form and structure of the tubes is inherited with sufficient 

 constancy to determine the species. 



Subgenus 1. Solenosphactra, Haeckel. 



Definition. — Tubuli of the shell cylindiical or nearly cyliudiical, the outer and inner 

 apertures nearly of the same size. 



1. Solenosphwra variabilis, Haeckel. 



Tetrasolenia quadraia, Ehrenberg, 1872, AbhanJl. d. k. Akad. d. "Wiss. Berlin, Taf. x. fig. 20. 



Shell quite iiTegular roundish or polyhedral, with roundish pores of different size. Ten to fifteen 

 pores in the half meridian of the shell, two to three times as broad as the bars. Porous tubuli of 

 the shell in variable number (in one and the same colony), three to nine, mostly four to six ; 

 cyhndrical or subcyUndrical or somewhat conical, two to three times as broad as long, not longer 

 than the half radius of the shell. Inner aperture of the tubuh commonly as broad as the half radius 

 of the shell (or somewhat smaller), about as large as the truncated outer aperture. This species 

 is closely related to Collosphcera polyedra (p. 97), and may be derived from it by a short tube-like 

 prolongation of the larger apertures. 



Dimensions. — Diameter of the shell O'l to 0"16, of the pores 0"005 to 0'015 ; length of the 

 tubules 002 to 003, breadth of them 004 to 0-06. 



Habitat. — Central area of the Tropical Pacific, Stations 270, 271, 272, depths 2425 to 2925 

 fathoms. 



2. Sole nosphcera pandora, n. sp. (PI. 7, figs. 10, 11). 



Shell irregular roundish or subglobular, with roundish pores of different sizes, mostly somewhat 

 broader than the bars. About twelve to sixteen pores on the half meridian of the shell. Porous 

 tubuli of the shell of variable number (in one and the same colony), one to six, mostly three to 

 four ; cylindrical or nearly cyhndrical, somewhat longer than broad, not longer than the radius of 

 the shell Inner aperture of the tubuli commonly as broad as the half radius of the shell, and a 

 httle smaller than the truncated outer aperture. 



Dimensions. — Diameter of the .shell 007 to 01, of the pores 0-003 to 0006 ; length of the 

 tubuli 003 to 0-05, breadth of them 0-02 to 0-03. 



Habitat. — Central area of the Tropical Pacific, Stations 266 to 274, depths 2350 to 2925 

 fathoms. 



(ZOOL. CHALL. EXP. PART XL. — 1885.) Rr 15 



