. 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
. 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, (Plate XLIX, fig. 4; Fig. 17). Holotype. 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
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