REPORT ON THE HEXACTINELLIDA. 375 



one side that the outermost do not include much more than a right angle. The paren- 

 chyma contains oxyhexasters with long terminal rays disposed in a perianth-like 

 fashion. South-east of Prince Edward Island, 140 fathoms; south of Kerguelen, 150 

 fathoms; east of Buenos Ayres, 600 fathoms. 



Species 2. Rossella velata, Wyville Thomson. 



At the base tufts of long basalia project like the pleural tufts, and unite into a root 

 anchoring the sponge in the mud. The four tangential rays of the pleuralia are crossed 

 at risht angles. The basalia end in anchors, the four teeth of which are somewhat 

 markedly recurved. The parenchyma contains plumicomes. West of Gibraltar, 

 651 fathoms. 



Genus 4. Accmthascus, n. gen. 



Thick-walled goblets firmly attached by the blind lower end. The gastral cavitj- 

 opens superiorly by a simple smooth-margined round oscular aperture. Diact pleuralia 

 project radially on the sides. The parenchyma contains oxyhexasters and discohexasters 

 in varied form. The dermalia are small rough tetracts and pentacts. 



Species 1. Accmthascus grossularia, n. sp. 



The pleuralia project as isolated spicules, so that the egg-shaped body comes to 

 resemble a gooseberry. The parenchyma contains discohexasters in which numerous 

 terminals are borne on the broad terminal plate of the principal rays, while others have 

 the long terminals arranged in perianth-like fashion. The dermalia are for the most 

 part tetracts, though pentacts also occur. The gastralia are spinose oxyhexaets. Posses- 

 sion Island, 210 fathoms. 



Species 2. Accmthascus duhius, u. sp. 



The parenchyma contains oxyhexasters in which the long terminal rays seem to 

 spring directly from the central node, as the result of a marked shortening of the prin- 

 cipals. Besides these, discohexasters occur with short principal rays. The dermalia are 

 pentacts, the gastralia are rough oxyhexaets. South of Puerto Bueno, in Patagonia, 400 

 fathoms. 



Species 3. Accmthascus cactus, n. sp. 



From numerous gentle elevations on the external surface, tufts of radially disposed 

 oxy diact pleuralia project. The parenchyma contains discohexasters with eight or more 



