368 ADDITIONS. 



branching sponge very like a stunted specimen of 

 Chalina oculata, but with distinctive characters in its 

 form, that induced me to examine it more closely, and 

 on submitting sections of it to microscopical examina- 

 tion in Canada balsam it proved to be a specimen of 

 G. Flemingli in a very much more developed state 

 than the fragment figured in Plate LXVIII, fig. 1, as 

 the type of the species with which, in its anatomical 

 details, it agreed perfectly. In the type-specimen, 

 which appears to me to have been but a portion of a 

 more perfect specimen, the form is more or less 

 latticed by inosculating branches ; but in the specimen 

 now under consideration the general aspect of its form 

 is very like that of Chalina oculata. It has a short 

 stout pedicel an inch in height, and above this divides 

 into numerous branches, dichotomously or trichoto- 

 mously which frequently assume more or less of a com- 

 pressed fan-like shape, and the distal terminations of 

 the branches, unlike those of G. oculata, are thick 

 and very obtuse ; the oscula were small and simple 

 and irregularly dispersed, not exhibiting any disposi- 

 tion to lateral linear arrangement as in the branches 

 of G. oculata. The height of the sponge is three and 

 a half inches, and its greatest breadth two inches. 

 These differences in the forms of the two species are 

 of consideraljle importance in their discrimination. 



Chalina inob.nata, Plate LXXXIII. 



Since the figuring of the type-specimen of this 

 species I have received several specimens from the 

 Rev. A. M. Norman who found them in Bantry Bay. 

 They are about the same size as the Cornish one, and 

 they fortunately had the dermal membranes in a fine 

 state of preservation, thus enabling me to correct and 

 complete the specific characters of the species. In the 

 Bantry Bay specimens, the dermal membrane is abun- 

 dantly spiculous and the spicula are nearly all of them 



