EEPORT ON THE RADIOLARIA 117 



Genus 42. Coronosphcera,^ n. gen. 



Definition. — C ollospliaer ida with simple shells, the pores of which are pro- 

 longed into external simple radial tubuU with fenestrated walls ; outer mouth of the 

 tubuli armed with a coronal of spines. 



The genus Coronosphcera dijffers from Solenosphcera by the coronated mouth of the 

 tubuli, from Trypanosphcera by the fenestration of the walls of the tubuli. 



1. Coronosphcera diadema, n. sp. (PI. 7, fig. 3). 



Shell spherical or subspherical, with a variable number (fifteen to twenty) of short, coronal-like 

 tubules, irregularly scattered, about half as long as the radius of the shell. Outer aperture of the 

 tubuli irregularly dentated, a httle dilated, and not much broader than the inner aperture, one-half 

 or one-third as broad as the shell radius. Pores of the shell and of the tubuli circular or roundish, 

 very irregularly scattered, mostly one-half or one-third as broad as the bars. 



Dimensions. — Diameter of the shell Oil to 14, of the pores 0-002 to 0-004, of the bars 0006 

 to 0-012 ; length of the tubuli 0-03, inner aperture 0-02 to 0-03, outer aperture 0-03 to 0-04. 



Habitat. — Central Pacific, Stations 268 to 270, depths 2550 to 2925 fathoms. 



2. Coronosphcera calycina, n. sp. (PI. 7, fig. 4). 



Shell spherical or subspherical, with a variable number (eight to twelve) of large, funnel-like 

 tubules, irregularly scattered, about as long as the radius of the sheU. Outer aperture of the 

 tubuM irregularly dentated, much dilated, somewhat broader than the shell radius, three to four 

 times as broad as the inner circular aperture. Pores of the shell and of the tubuli circular or 

 roundish, of very different size, one to three times as broad as the bars. 



Dimensions. — Diameter of the shell O'l to 0-3, of the pores 0-003 to 0-01, of the bars 0-002 

 to 0004 ; length of the tubuli 01, inner aperture 002 to 003, outer aperture 0-06 to 018. 



Habitat. — Central Pacific, Stations 271, 272, depths 2425 and 2600 fathoms respectively. 



3. Coronosphcera convolvulus, n. sp. 



Shell irregular roundish, with a variable number (five to ten) of long, curved tubules, about as 

 long as the sheU diameter. The inner half of the tubuH is narrow, cyhndrical ; the outer half 

 funnel-like dilated, similar to the flower of Convolvulus. The outer aperture is elegantly dentated, 

 five to six times as broad as the inner aperture. Pores of the shell and of the tubuh very irregular 

 roundish, about as broad as the bai-s. 



Dimensions. — Diameter of the shell 0-08 to 0-09, of the pores and bars 0-004 to 0-008 ; length 

 of the tubuh 0-07 to 01, inner aperture 0-01, outer aperture 0-05. 



Habitat. — Tropical Atlantic, Station 347, surface. 



' C'oro)iosp/tctra = Coronal-3i)liere ; xo^^ioi, o^aij*. 



