1590 THE VOYAGE OF H.M.S. CHALLENGER. 



the distal branches are much smaller and simple. The distal end of each branch bears a 

 spathilla with four to six short teeth. 



Dimensions. — Length of the tubes 24 to 3-6, breadth 0-06 to 0-08. 



Habitat. — South Atlantic, Station 332, depth 2200 fathoms. 



5. Aulodendron indicum, n. sp. (PI. 105, fig. 1). 



Eadial tubes cylindrical, irregularly curved, tapering gradually towards the two ends ; smooth in 

 the proximal half, in-egularly branched in the distal half, with ten to twenty or more curved 

 branches. The proximal branches are very large, one-sixth to one-fourth as long as the tube and 

 irregularly ramified ; the distal branches are much shorter, also ramified or simple. All the branches 

 are more or less curved and bear a spinulate knob at the distal end. 



Dimensions. — Length of the tubes 1-2 to l^S, breadth 0'02 to 0"G3 ; length of the branches 

 01 to 0-3. 



Habitat. — Indian Ocean ; Cocos Islands (Eabbe), surface. 



Order II. PHiEOSPH^EEIA, Haeckel, 1879. 



Definition. — PHiEODARiA with a simple or double, usually spherical lattice-shell, 

 which is not bivalved and has no peculiar mouth or peristome. Central capsule placed 

 in the centre of the shell. 



FamUy LXXIV. Orosph^rida, n. fam. (Pis. 106, 107). 



Definition. — Ph^odaria with a big spherical (sometimes polyhedral or ellipsoidal), 

 very coarse shell, which is composed of thick bars containing an axial canal. Nodal 

 points of the coarse network without astral septa. Meshes of moderate size, irregularly 

 polygonal. Surface of the shell usually with radial spines and pyi-amidal elevations. 

 No peculiar mouth in the shell. Central capsule tripyleau, in the centre of the shell. 



The family r o s p li as r i d a comprises those Ph^odaria which possess a simjile 

 spherical or polyhedral lattice-shell, composed of hollow, very thick, non-articulate rods, 

 without a peculiar shell-mouth. They agree in the considerable size of the spherical lattice- 

 shell and the absence of a peculiar shell-moiith with the other Phseosphseria, but dift'er 

 from them in the coarse and irregular shape of the massive network, which is composed 

 of irregular polygonal meshes, separated by very thick concentrically stratified rods, 

 containing a fine axial canal. The closely allied Sagosphserida differ from them in the 

 delicate shape of the solid and very thin, filiform rods of the network, and its subregular 



