OF THE KERGUELEN REGION OF THE GREAT SOUTHERN OCEAN. 403 



LIST III. 



Metazoa procured by the Challenger in Intermediate Depths between 150 

 and 1000 Fathoms, in the Kerguelen Region. 



Returning now to the region in the Southern Indian Ocean traversed by the 

 Challenger during the cruise from the Cape of Good Hope to Australia, which is the 

 special subject of this paper, we proceed to complete our review of the marine 

 fauna of this Kerguelen Region by giving a list of the species taken by the 

 Challenger in depths less than 1000 fathoms. We give in the first place a list 

 of the species taken in moderate depths (between 1000 and 150 fathoms), reserving 

 for a future list (List IV.) the essentially shallow- water species taken in depths less 

 than 150 fathoms in the same region. There were only three dredgings taken in 

 intermediate depths between 150 and 1000 fathoms, viz., at Station 145a, near Marion 

 Island, in 310 fathoms, and at Stations 148 and 148a, near the Crozet Islands, in 

 210 and 550 fathoms; the trawl was not used at any of these Stations. The species 

 known only from these dredgings are indicated by an asterisk # . 



Monaxonida : 



Axinella erecta (Carter). 

 *Esperiopsis symmetrica* Ridley and Dendy. 



Gellius carduus? Ridley and Dendy. 



lophon chelifer, 3 Ridley and Dendy. 

 * ,, laminalis? Ridley and Dendy. 



1 Esperiopsis symmetrica is a very remarkable sponge, the most noticeable feature in which is the radiately sym- 

 metrical arrangement of the skeleton. — (Ridley and Dendy, Zool. Chall. Exp., part 59, p. 78.) 



2 Gellius carduus is readily distinguished by its very characteristic external form, the surface resembling that 

 of a large thistle-leaf, whence the specific name. The shape of the skeleton spicules is also very characteristic. . . . 

 The variety magellanica is a very interesting geographical variety from the Strait of Magellan. The main features in 

 which it differs from the type specimens concern the oxeote spicules which, in the variety in question, are much more 

 pointed and a good deal shorter than in the type. — (Ridley and Dendy, Zool. Chall. Exp., part 59, pp. 39, 40.) 



3 Three specimens of this interesting species [lophon chelifer] are present ; two are fairly large, but broken into 

 fragments, the other is small, and occurs encrusting a branched Polyzoon. The latter is in all probability a young 

 form, and differs in several minor respects from the larger specimens. . . . The species differs very decidedly from 

 all described forms in the large size and also in the degree of elaboration of the bipocillate spicules. The other 

 spicules are also larger in almost every case than the corresponding forms in other species of lophon ; lophon (Alebion) 

 piceum, Vosmaer, from Barents Sea, approaches it the most nearly in this respect. — (Ridley and Dendy, Zool. Chall. 

 Exp., part 59, pp. 119-120.) 



4 Only one specimen, broken into fragments, of this interesting species [lophon laminalis] was obtained. In the 

 line state of development of its bipocillate microsclera it approaches lophon chelifer, a specimen of which was obtained 

 at the same Station ; while in external form it probably comes near lophon piceum, Vosmaer, from Barents Sea. The 

 species to which it is perhaps most nearly related is, however, lophon cylindricus (from off Cape Howe), which, like it, 

 has the stylote spicule smooth.— (Ridley and Dendy, Zool. Chall. Exp., part 59, p. 121.) 



