DISCOVERY REPORTS 



oxea measuring 0-14 by o-oi mm. A comparison of Figs. 15 and 16 will show clearly the 

 obvious way in which the skeleton of the present specimen differs from that of the type. 

 In fact, there might be something to be said in favour of regarding the two specimens as 

 specifically different, but for the fact that the differences they exhibit can be shown by 



Fig. 16. Callyspongia fusifera (Thiele). Holotype. a, dermal skeleton, x 66; b, main skeleton, x 66. 



comparison with the known variations in other species of Callyspongia to be unim- 

 portant, and also by the fact that the co-types of the species are to an extent inter- 

 mediate between these two specimens. In the specimen from Calbuco, for example, the 

 spicules are almost identical in shape with those of the Discovery specimen, though 

 slightly smaller. Unfortunately, I have no information as to the structure of the skeleton 

 in the co-types, but it is probable that intermediate characters will be found in this too. 

 The co-type from Punta Arenas has oxea measuring 0-24 mm. long, considerably longer 

 than those of the present specimen. 



Distribution. Calbuco ; Tumbes ; Punta Arenas. 



Callyspongia flabellata, sp.n. (Plate XLIX, fig. 4; Fig. 17). 

 Holotype. B.M. 28. 2. 15. 359. 

 Occurrence. St. WS 81 : Falkland Islands, 81-82 m. 



Diagnosis. Sponge flabellate, pedunculate; surface even, minutely hispid; oscules 

 numerous, 1-2 mm. in diameter, mainly disposed in an irregular linear series along 

 margins of sponge; pores apparently distributed generally over surface; colour, in 

 spirit, greyish yellow ; main skeleton irregularly isodictyal, uni- or multispicular ; dermal 

 skeleton a tangential network of fibres, similar to those of main skeleton, echinated at 

 nodes by tufts of spicules projecting at right angles ; spicules oxea, straight, smooth, 

 0-105 by 0-009 "^rn- 



Remarks. The dermal skeleton is not easily detected. It cannot be readily removed, 

 as is usual in other Chalininae with a special dermal skeleton, and the fact that its nodes 

 are echinated by tufts of spicules makes it appear as though the sponge were a true 



