112 THE VOYAGE OF H.M.S. CHALLENGER, 



the distal end, with two or three short irregular branches of unequal size and form ; branches much 

 shorter than the undivided basal part of. the tube, Mouth of the branches narrowed, truncated. 

 Pores of the shell between the tubes about half as broad, irregularly roundish or polygonal, two to 

 three times as broad as their bars. Ten to twelve pores in the half meridian of the shell 



Dimensions. Diameter of the shell 0'05 to 0'07, of the pores O'OOG to 0'009 ; length of the 

 tubules 0'06 to 0'09, breadth of them 0'015 to 0'02. 



Habitat. Tropical Central Pacific, Station 271, depth 2425 fathoms. 



3. Caminosphcera dichotoma, n. sp. (PL 7, fig. 2). 



Shell spherical, with a variable number (ten to fifteen) of cylindrical tubes, irregularly scattered, 

 about as long as the radius of the shell. Every tube furcated, with two cylindrical branches of the 

 same size as the simple basal part of the tube. Mouth of the branches dilated, funnel-like, twice 

 as broad as the tube ; the edges irregularly dentated or lacerated. Pores between the tubes small, 

 one-third to one-sixth as broad as these, half as broad as their bars. Ten to twelve pores in the half 

 meridian of the shell. 



Dimensions. Diameter of the shell 012 to 014, of the pores 0'003 to 0'005 ; length of the 

 tubules 0-06 to 0'08, breadth of them 0'02 to 0'03. 



Habitat. Southern Pacific, Station 295, depth 1500 fathoms. 



4. Caminosphcera dendrophora, n. sp. (PL 7, fig, l). 



Shell spherical, with a variable number (eight to twelve) of long cylindrical tubes, irregularly 

 branched and scattered, nearly as long as the diameter of the shell. Every tube with two to six 

 (commonly three to four) branches of different sizes. Mouth of the branches dilated, funnel-like ; 

 the edges irregularly dentated or lacerated. Pores between the tubes half as broad as these, 

 irregularly roundish, twice as broad as their bars. Ten to twelve pores in the half meridian of the 

 shell. 



Dimensions. Diameter of the shell 012 to 015, of the pores O'OOG to O'Ol ; length of the 

 tubules 01 to 013, breadth of them 0'02 to 0'025. 



Habitat. Central Pacific, Station 266, depth 2750 fathoms. 



Genus 40. Solenosphcera, 1 n. gen. 



Definition. C ollosphaerida with simple shells, the pores of which are 

 prolonged into external simple radial tubuli with fenestrated wall; outer mouth of the 

 tubuli truncated, smooth. 



The genus Solenosphcera differs from SipJionosphwra in the fenestration of the 

 external radial tubes. A large number of shells, appertaining to this genus, were already 

 described by Ehrenberg, and disposed in five different genera corresponding to the 



1 Solenospfuera = Sphere with tubules ; eraTujv, a<r<o. 



