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



the distal end, with two or three sliort 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 005 to O-O?, of the pores 0-006 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. Caminosp}i(Bra 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-Hive, 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 0-12 to 0-14, of the pores 0003 to 0005 ; length of the 

 tubides 0-06 to 0-08, breadth of them 002 to 003. 



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



4. Caminosphcera dendropJiora, n. sp. (PI. 7, fig, l). 



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

 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 irreg-ularly 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 tlie half meridian of the 

 sheU. 



Dimensions. — Diameter of the shell 0-12 to 0-15, of the pores O'OOG to 0-01 ; length of the 

 tubules 0-1 to 0-13, breadth of them 002 to 0-025. 



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



Genus 40. Solenosphcera,^ n. gen. 



Definition. — C ollosplia3ri da -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 Solenosphcura diffei-s from SijyhonosphcBra 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 



* iSofenospAflsra = Sphere with tubules ; auJyviv, a(pal^ce. 



