220 



TETRACTINELILDA CHORISTIDA. 



Family TetiUidSB. 



3. Spongocardium gilchristi. gen. et ep. n. 



4. Tetilla bonaventura, sp. n. 



5. Tetilla casula, Carter. 



Family Pachastrellidae. 



6. Pachastrella caliculata, sp. n. 



7. Pachastrella isorrhopa, sp. n. 



Family StellettidSB- 



8. Stelletta horrens, sp. n. 



HEXACTINELLIDA. 



Five specimens^ representing two species, both of which belong 

 to the family Rosscllidac, have been obtained. One species was 

 described by me (Ann. & Mag. Nat. Hist., May, 1901) under the 

 name Rhahdocalypius lophodigitatus. I regret that it is necessary 

 to alter the Grasco-Latin specific name, and propose to change it 

 to plnmodigitatus. By desire of Dr. Gilchrist, the description of 

 this species is incorporated in the present paper. The second 

 species is a new one belonging to the genus Crateroniorpha- 



Family RossellidsB. 



Sub-family Acanthascinae, F. E. Schulze [8], p. 348. 

 Genus Rhabdocalyptus. F- E. Sclmlze [9], p. 155. 

 Rhabdocalyptus plumodigitatus, Kirkpatrick [6], p. 458. 



Sponge in form of a thick-walled subglobular cup, from the base 

 of which proceed solid digitate processes provided with tufts of 

 basalia_, forming in the fully grown condition a dense root-tuft; 

 tufts of basaha also originating from the general basal surface of 

 the sponge. Outer surface provided with small conical papilla;, 

 from which bundles of pentact pleuralia project radially, the 

 paratangential rays of the spicules forming a veil about 1.5 ccntiiri. 

 from the surface- Orifice subcircular, with thin naked edge. 

 Cavity of cup shallow, with smooth walls, and with very large 

 openings at the lower part leading into wide cavernous efiferent 

 ranals. 



