268 PEROY SLADEN TRUST EXPEDITION 



Register Nos., Localities, <&c. xxxiii. 1, 3, xliii. 2, 4, all from Cargados Carajos, 

 30.8.05, B. 13, 30 fathoms; lxxxvii., Amirante, 9.10.05, E. 6, 28 fathoms; cxxxv. 2, 

 Seychelles, 13.10.05, F. 9, 37 fathoms. 



24. Chondrilla mixta Schulze. 



(Plate 48, fig. 7.) 

 Chondrilla mixta Schulze [1877 c]. 

 ? Chondrilla mixta Ridley [1884 c]. 

 Chondrilla mixta Lindgren [1897, 1898], 

 Chondrilla mixta Kirkpatrick [1900 b]. 



This species was described by Schulze from the Red Sea. Schulze had only a single 

 specimen, of which he observes " Dasselbe stellte eine blassgraue, braungefleckte Kruste 

 von 2 — 4 Mm. Dicke mit unregelmassig welliger aber glatter Oberflache dar." 



The "Sealark" specimens are for the most part dark brown or nearly black on the 

 surface, owing to the strong development of pigment-granules in and beneath the cortex. 



The spicules are by no means numerous and in some specimens almost disappear from 

 the cortex, so that it is hard to find anything but the choanosomal oxyasters. 



The characteristically cortical spherasters (Plate 48, fig. 7 a) resemble those of 

 C. australiensis and measure about 0'03 mm. in diameter. The choanosomal oxyasters 

 (fig. 7 &) are of about the same size or a little smaller. They difier from those of C. austra- 

 liensis in having smooth, unbranched rays. Apart from the possible difference in colour 

 this seems to be the only feature that distinguishes the two species, and it may well be 

 doubted whether the two are more than varietally distinct. 



The specimen described by Ridley from the Amirante group was of a pale brown 

 or buff colour and had oxyasters frequently with branched rays ; it was probably 

 C. australiensis. 



Two specimens described by Lindgren from Java and Gaspar Straits were blue-black 

 on the outside with a finely granulated surface due to the presence of very minute papillae. 



Previously knowyi Disti'ihution. Red Sea (Schulze) ; Java and Gaspar Straits 

 (Lindgren) ; Funafuti Atoll (Kirkpatrick). 



Register Nos., Localities, &c. liii. 8, Coetivy ; lvii. 1, Coin, Peros ; ex. 4, cxiii. 3, 9, 

 Egmont Reef; cxii. 2, 4, Egmont Lagoon ; cxx. 6, Salomon, 10 — ]4 fathoms. 



25. Chondrilla sacciformis Carter. 

 (Plate 48, fig. 8.) 



Chondrilla sacciformis Carter [1879 b]. 

 Magog sacciformis SoUas [1888]. 

 Chondrilla grandistellata Thiele [1900]. 



The single specimen in the collection forms an elongated, slug-shaped crust, about 

 30 mm. in length, 10 mm. in greatest breadth and 6 mm. in greatest thickness. The 

 margins are strongly incurved towards the base of attachment, probably owing to con- 

 traction after removal from the substratum. There are five or six minute, contracted 

 vents, scattered singly, each on a small mammiform projection on the upper surface. The 



