Qm Mr. R. Kiikpatiick on 



hota outside tlie depressions and that they have been overlooked 

 by Sollas. I have carefully searched for these pores and 

 have not been able to detect any; indeed, it would be 

 surprising if pore-canals could penetrate the dense palisade of 

 cortical oxeas. Since the depressions are smooth-walled and 

 the pores in their walls are smaller and more numerous than 

 those on the general surface^ I think that probably the 

 depressions are poral vestibules similar to those of G. harbata, 

 that some of the "Poren" on the surface are oscules, 

 possibly much contracted, and that this kind will be found 

 occupying a more or less definite area. 



An eighth species of Cinachjra mentioned in Lendenfeld's 

 list, viz. C. rohusta (Carter), from Mergui (i, p. 79), remains 

 to be noticed. The Natural History Museum possesses one 

 half of the type specimen. Judging from its appearance, I 

 should take it to be a macerated specimen of I'etilla which 

 has become much worn down with age and rough usage from 

 strong currents, so tliat the whole of the cortex has become 

 denuded, leaving large open spaces and caverns between the 

 radiating fibres of the skeleton. Carter {l. c. p. 79) writes : — : 

 " The spicules of the interior, which project so abundantly as 

 to produce a hispid condition of the surface, are so matted 

 together by the mud in which the sponge has grown on the 

 subjacent rock that, in taking off this crust, the ' forks ' and 

 ' anchors/ together with the projecting ends of the ' body- 

 spicules,^ all come aivay with it." Sollas^s designation 

 (9, p. 48), viz. Tetilla rohusta, of Carter^s Tethya cranium, 

 var. rohusta, seems to me correct. 



Apparently only one of the seven species at present retained 

 in the genus Cinachyra has a cortex with a dense palisade of 

 oxeas, tliough several of the others appear to possess a thick 

 fibrous cortex. 



Very young specimens of Cinachyra are conical and 

 have only one large poral vestibule, situated iuferiorly and at 

 one side, the one oscule being at or near the summit. This 

 asymmetrical arrangement calls to mind the sponge Spongo- 

 cardium Gilchristi, Kirkp. (5, p. 224), from South Africa. 

 1 now think that Spougocardium must be regarded as a 

 synonym oi Fangophilina^O. Schmidt (8, p. 73, pi. x. fig. 3), 

 in spite of the fact that F. suhmersa has a well-developed 

 root-tuft, and F. Gilchristi appears not to possess this 

 appendage, though a root-tuft may have been torn off in 

 dredging. 



