404 I)K MURKAY ON THE DEEP AND SHALLOW-WATER MARINE FAUNA 



Myxilla nohilis,' Ridle}' and Deudy. 

 *-PhakeUia papyracea,^ Ridley and Dend}-. 

 *Suhetites inollis," Ridley and Dendy. 



[Tetractixellida : 



Tctilla antarctica (Carter). Taken by Ross' Antarctic Expedition in the neighbour- 

 hood of Victoria Land (lat. 74" 30' and 77' 30' S.), 20G and 300 fathoms.] 



Hexactixellida : 



*Acantliascus grossularia, Schulze. 

 * AiiJascus johnstoni, Schulze. 



Aviocalyx irregularis, Schulze. 



Chonelasma lamella, Schulze. 

 sp. (?). 



Alcvonaria : 



*Acanthogorgia ramosissima, Wright and Studer. 

 *Lophogorgia lutkeni, Wright and Studer. 



Pleurocorallium secundum, Dana. 

 *Frimnoides sertularoides, AVright and Studer. 



Primnoisis antarctica (Studer). 

 *Stenella spinosa, Wright and Studer. 

 ThotiMrella antarctica (Valenciennes). 



,, variabilis,* Wright and Studer. 



„ var. hrevispinosa, Wright and Studer. 



' The species which we have called Myxilla nohilu, and its varieties, liave given us a great deal of trouble in 

 determining their true relations ; thej appear to be sufficiently connected inter ee to warrant us in considering them 

 hU as varieties of one species, and that species perhaps finds its nearest already known ally in Bowerbank's HymeniaMon 

 {Myxilla) imu-perias [British] ; the two species seem, however, to 1)C distinct.— (Ridley and Desdy, Zoul. CItall. Exp., 



l>art, .09, p. 143.) 



« J'kalxllia fapyracea is a very delicate species, which ]>erhap» comes near U) Bowerbank's hodidya infundibuli- 

 formu [British], more esj)eciaily if it sliould ultimately prove to be cup-sliape<l when jierfect, but it is distinguished at 

 once and aVjsolutely from that species by the absence of the oxeote spicules, so that further comparisons are needless. 

 In the absence of the oxeote spicules, however, it agrees with voN Mabexzelleb's C'ribrochalma ambigm [from Jan 

 MuytnJ, but differs widely in the size of the spicules, while there do not seem to be two distinct sizes as in our sponge. 

 — (RiLiLEY and Desdy, Zwl. CImU. Ej'i)., part 59, p. 172.) 



3 The most remarkable features of this sponge [HuheriUs mollis] are its great softness and looseness of texture, as 

 compared with the more typical sjiecies of Huhmlm, and the reduction of the " dermal crast " of spicules, which no 

 longer forms a distinct cortical kyer.— (Ridley and Dendy, Zool. Chall. Exp., part 59, p. 205.) 



"♦ Th'juarella variahilin, of which there are numerous examples, varies to an extraordinary degree in the size of the 

 calyces, the development of the spines, and the development of the colony, without it being possible thereby t<; sharply 

 separate; tlie individual forms specifically. Nevertheless one can generally distinguish the follcAving three varieties from 

 each other : a. thety]* (Station 145, 310 fathoms), b. var. brevisjnnosu (Station 145, 310 fatliom.s),c. var. ;/racilis (Station 

 150, 150 fathoms).— (W'bkjht and Stcdee, Zool. Chall. Ex!p., part 64, \>. 68.) • 



