OF THE KEEGUELEN REGION OF THE GREAT SOUTHERX OCEAN. 413 



Gelliiis gladalis, var. nivea, Eidley and Dendy. 

 HaUcIiondria pantcea, Johnston. 

 sp.(?). 

 *Iophon abnovmalis, Ridley and Doudy. 

 Latmncxdia apiccdis,^ Eidley and Dendy. 



* „ hocagei,^ Ridley and Dendy. 

 *Mi/xilIafi(sca, Ridley and Dendy. 



,, mariana, Ridley and Dendy. 

 *Pachi/chcdina (?) pedunndataj- Ridley and Dendy. 

 *Pct)'osia hispida, Ridley and Dendy. 

 • ,, simUis,^ Ridley and Dendy. 



Stylocordyla stipitata (Carter), var. glohosa, Ridley and Dendy. 

 Sidierites antarcticits. Carter. 



,, caminatus* Ridlev and Dendv. 



* ,, mierostomns, Ridley and Dendy. 



Tetractixellida : 



*Cinachyra harhata;' SoUas. 



the Arctic Sea, thougli the exact localitj- is unknown. Having regard to the want of definite characters in this species 

 other than the form of the sigmata, we cannot further insist on the strong resemblance which this form bears to our 

 species, as its locality is so far removed from that of Gellius flagelUfer. — (Eidlet and Desdy, Zool. Chall. E.cp., part 59, 

 p. 43.) 



1 As regards external form it will be seen that LairuncuUa hocagei is almost indistinguishable from the Kerguelen 

 specimen of Latrunculia apimUs, and correspondingly different from Latrimculia brevis [Station 320, oflf the Eio de la 

 Plata, 600 fathoms] ; but in this case we are not inclined to set much value on external form as a specific character, 

 for we have already seen that the specimens of Latrunculia apicalis from Kerguelen and from Station 320 respectively, 

 differ in external appearance ; indeed, to judge from the Challenger series of specimens of the genus, it woidd seem 

 that external appearance depends on the locality, and that all the species from the same locality tend to have a similar 

 external form. — (Ridlet and Dexdt, Zool. Chall. Erp., part 59, p. 239.) 



- Pachychalina (') pedunculata resembles in several respects Vosmaer's Pachychalina canlifera (from the Arctic Sea), 

 but it is cylindrical instead of flattened, and the shape of the spicules is different, being slender instead of broadly 

 fusiform. The fibres in Pachychalina caulifera appe^ir to contain a good deal more spongin than in the jiresent species ; 

 indeed, it is only doubtfully that we include the latter in the genus at all ; it forms another connecting link between 

 the Eenierina; and Chalinina^, and shows how little value can be placed upon the amount of spongin present for 

 purposes of classification. — (Ridley and Dexdy, Zvol. Chall. Exp., part 59, p. 25.) 



^ No doubt the Kerguelen specimen [of Petrosia similis] forms a connecting link, but we think it advisable to 

 distinguish between two closely allied species, Petrosia sid)triangxilaris and Petrosia dmilii-, the former characteristic of 

 West Indian seas, and the latter of the seas south of the Cape. Two well-marked varieties of the latter are described 

 below [one from near the Falklands, the other from the Philippines]. — (Ridley and Dendy, Zool. Cltall. Exp., part 59, 



p. n.) 



* The single specimen [of l^uherites caminatus] in the collection is attached by a broad base to an empty Bi-achio- 

 pod shell, and terminates in a singular oscular projection at the apex. . . . This is a very pretty and interesting little 

 sponge ; it may be recognised by its external form, and more especially by the projecting, well-marked osculum. . . . 

 We have from Station 320 au interesting series of specimens which should perhaps be considered as belonging to a slight 

 variety of the above species ; they do not, however, appear to be distinct enough from the type to justify us in giving a 

 varietal name. They occur, for the most part, encrusting dead branches of a Sporadopora, on which they form colonies, 

 the different cushion-like individuals being united together by their bases. . . . The sponge is further remarkable 

 as forming colonies by continuous gemmation, in a manner very rare in silicious sponges. — (Ridley and Dkxdy, Zool. 

 Chall. Exp., part 59, pp. 19S-9.) 



* Over sixty specimens of this remarkable sponge \Cinachyra barbatal were dredged off the shores of Kerguelen. 

 They vary considerably in shape ; the smallest is a prolate ellipsoid, the next a little larger is egg-shaped, both arc 



