1887.] MR. A. DENDY ON THE WEST-INDIAN CHALININ^. 505 



Genus Siphonochalina, Schmidt. 



SiPHONOCHALINA SPICULOSA, Sp. U. 



Sponge consisting of a number of long, smooth, upright cylindrical 

 tubes, united together at the base a n also at points of contact. 

 Height 27 cm., greatest width 21 cm. Diameter of tubes at top 

 3 cm. Colour (dry) light yellowish grey. Texture rather brittle. 



Main skeleton consisting of a network of coarse spiculo-fibre, 

 composed of very numerous spicules with rather a small proportion 

 of spongin. Primary. and secondary fibres distinct, giving rise to 

 more or less rectangular meshes. Diameter of primary fibres about 

 0"06 millim., of secondaries somewhat less ; both contain much 

 foreign matter, grains of sand &c., imbedded amongst the spicules. 

 The dermal skeleton (on the outer surface) is a polygonally meshed 

 network of stout spiculo-fibre, 0'03 millim. in average diameter. 



Spicules shglitly curved, sharp-pointed oxea ; size 0'138 by 0"006 

 millim. Occurring in the fibres and scattered between. 



Turk's Island, Bahamas. 



Siphonochalina procumbens, Carter, sp. 



1882. Patuloscula procumbens, Carter, Ann. & Mag. Nat. Hist, 

 eer. 5, vol. ix. p. 365. 

 West Indies, Grenada, 



Siphonochalina ceratosa, sp. n. 



Sponge consisting of a number of upright, cylindrical, thick- 

 walled tubes, united together in an irregular basal mass, and also 

 united laterally in places by the development of horizontal trabe- 

 culae or by direct fusion. Total height 24 cm., breadth about 30 cm. 

 Diameter of orifice of tubes averaging about r5-2 cm. Surface 

 smooth but uneven. Colour clear, pale yellow. Texture firm but 

 elastic. 



Main skeleton a regular, rectangularly and close-meshed reticula- 

 tion of stout horny fibre. Primary fibres about 0053 millim. thick, 

 secondaries but little less. Dermal skeleton (on the outer surface) 

 a polygonally meslied reticulation of stout fibre, not distinguishable 

 from the main. 



Spicules represented by mere traces of slender oxea, which appear 

 to have been almost completely absorbed. 



Nassau, Bahamas. 



Genus Spinosella, Vosmaer. 

 1864. Tuba, Duchassaing and Michelotti, &c. 



Spinosella sororia, Duchassaing and Michelotti, sp. 



1864. Tuba sororia, Duchassaing and Michelotti, Spong. Mer 

 Caraibe, p. 46, pi. viii. fig. I , 



1870. Siphonochalina papyracea, Schmidt, Spong. Atlant. Gebiet. 

 p. 33. 



West Indies. 



