REPORT ON THE RADIOLARIA. 99 



Genus 32. Bucmiosphcera,^ n. gen. 



Definition. — C o 1 1 o s p li ^ r i d a with simple shells, having on the inside radial 

 centripetal tubes, the walls of which are fenestrated. 



The genus BuccinosphcBva exhibits, on the inner surface of the shell, radial centripetal 

 tubules similar to those of the foregoing PharyngosphcBra ; but the walls of these 

 tubes are here latticed, not solid ; they represent therefore true invaginations of 

 the whole shell-wall. 



1. BuccinosphcBra invaginata, n. sp. (PI. 5^ fig. 11). 



Shell irregular roundish or nearly polyliedral, with a varialile number of umbilical depressions, 

 which are prolonged on the inside into cylindrical or somewhat conical, centripetal, fenestrated tubes, 

 about one-third as long as the shell radius. Tuner mouth of the tubes narrower, scarcely half as 

 broad as the outer mouth, about equal to one-fourth the shell radius, truncated. Pores of the 

 tubes and of the shell small, roundish, irregular in size and distribution, about as broad as the 

 bars. Twenty-five to tliirty pores in the half meridian of the shell. In all observed specimens 

 the spherical central capsule (half as broad as the shell) contained a large number of crystals. 



Dimensions. — Diameter of the shell O'l to 0'12, of the pores O'OOl to O'OOS, of the bars 

 0-002 to 0-003 ; length of the tubuU 0-02 ; outer mouth 0-026, inner mouth 0-013 ; crystals in 

 the central capsule 0-002 to 0-004, sometimes 0-088. 



Habitat. — Phihppine Islands (Samboangan), Station 213, surface. 



2. Buccinosphcera tubaria, n. s'p. 



Shell irregular polyhedral with rounded edges, with a variable number of umbilical depressions, 

 which are p)rolonged on the inside into large, nearly cyHndrical, centripetal, fenestrated tubes, 

 half as long as the shell radius. In the middle the tubes are somewhat constricted and narrower. 

 Inner mouth of the tubes dilated, nearly as broad as the outer mouth, about equal to one-half the 

 shell-radius, truncated. Pores of the tubes and of the sheU large, roundish polygonal, irregular in 

 size and distribution, three to four times as broad as the bars. Fifteen to twenty pores in the half 

 meridian of the shell. 



Dimensions. — Diameter of the shell 0-12 to 0-14, of the pores 0-008 to 0-002, of the bars O-OOi 

 to 0-004 ; length of the tubuli 0-03 ; outer mouth 0-04, inner mouth 0-03. 



Habitat. — North coast of New Guinea, Station 217, surface. 



Genus 33. Acrosphcera,^ Haeckel, 1881, Prodromus, p. 471. 



Definition. — C olios phaerida with simple shells, the outer surface of which is 

 covered with radial, ii-regularly scattered spines. 



' ^KcaTiotyAiEia = Trumpet-sphere ; fivKuun, c(fu7fa. * .4crospA(Era = Pointed-spliere ; iK^o;, afaipx. 



