186 Scientific Proceedings, Royal Dublin Society. 



of its spicules to N. schukii, but distinguished by the course of the 

 excurrent canals, which run obliquely and longitudinally upwards 

 through the plate to open in patent oscules on one face of the 

 plate. 



Habitat.— Porto Praya, St. Jago. 100-128 fms. 



iV. goliath, sp. n. — Sponge massive, surface raised into sharp 

 undulating ridges, with deep intervening furrows ; surface hispid ; 

 oscules numerous on the sides and summits of the ridges. Spicules — 

 (1) fusiform acerate, 2'475 by 0-08 mm. ; (2) calthrops, each ray 

 0-684 by 0-05 mm. ; (3) acerella, 0316 by 0-008 mm. ; (4) echi- 

 nella, 0-16 mm. long; (5) globules, 0-16 mm. in diameter. 



Habitat.— Station 122 ; lat. 9° 5' S. ; long. 34° 50' W. 350 fms. 



N. laminar is, sp. n. — Sponge, a thin lamellar expansion 4 to 5 

 mm. thick ; oscules small, dispersed on the inner face. Spicules — 



(1) a stout fusiform acerate, 3"5 by 0'05 mm. ; (2) a slender cylin- 

 drical acerate, 5-3 by 0-008 mm. ; (3) fork ; shaft, 0"678 by 0-06 ; 

 arms, 0357 by 0-06 mm. ; calthrops, acerella, echinella, and spini- 

 spirula also present. 



Habitat. — Amboyna. 



JV. tenuilaminaris, sp. n. — This chiefly differs from the preced- 

 ing species by the greater thinness of the wall, which is from 3 

 to 3*5 mm. thick. I now only provisionally distinguish it, reserving 

 a final decision to the completed report. 



Habitat.— Station 236, lat. 34° 58' N. ; long. 139° 29' E. ; 

 238-775 fms. 



Genus 3. Vulcanella, g. n. — Spicules similar to those of Nor- 

 mania ; sponge distinguished by the specialisation of the oscula, 

 each the large patent opening of a shallow cloaca, which is lined 

 by a coarsely fenestrate membrane. 



Vulcanella cribrifera, sp. n. — Sponge egg-shaped, bearing one 

 or more large oscules on the upper surface ; margins of oscules 

 strongly hispid. Spicules — (1) fusiform acerate, 3*04 by 0'067 mm. ; 



(2) slender hispidating acerate, 7*5 by 0'032 mm. ; (3) fork, 

 shaft, 1-0 by 004 mm. ; arms, 0'25 by 0-032 mm. ; (4) calthrops 



