210 SUPPLEIMENT. 



Order LITHISTID^. 



Family MEGAMORINA. 



Genus DORYDERMA, Zittel. 



DoRYDEEMA Daleyense, Hinde, n. sp. (Plate XXXVIII. figs. 7, Ta-g.) 

 Detached spicules, usually more or less curved and irregularly branching; the 

 branches are cylindrical in section, and either obtusely rounded at their terminations 

 or more frequently expanded transversely, and concave so as to be adapted for 

 clasping the surface of adjoining spicules. A fairly large spicule is I'l mm. in 

 length and -18 mm. in thickness. The general resemblance in form and in the 

 termination of the branches of these spicules to those vrhich form the skeleton of 

 the Cretaceous genera Dori/denna, Pachypoterion, and Heterostinia, and of the 

 existing genus Lyidium is sufficiently close to prove that sponges with this type 

 of spicular structure existed as far back as the Carboniferous epoch. 



Mr. Carter * has figured spicules of a similar character, but smaller than those from 

 Dairy, from strata of corresponding age at Ben Bulbul, near Sligo, and has referred 

 them as " in all probability surface-spicules like those of Coralliates aculeata." Not- 

 withstanding the difference in size, these Irish forms may probably belong to the 

 same species as those from Dairy. 



Distribution. Lower Carboniferous: Law Quarry, Dairy, Ayrshire. From the 

 collection of Mr. James Bennie. Ben Bulbul, near Sligo, Ireland. Presented by 

 Mr. J. Wright of Belfast. 



'&' 



Order HEX ACTI NELLI D^.. 



Family EURETID^. 



Genus SPORADOPYLE, Zittel. 



Sporadopyle Santanderi, Hinde, n. sp. (Plate XXXVIII. figs. 8, %a-~d.) 

 The only example of this species is a fragment, 55 mm. in length, of a dichoto- 

 mously branching sponge. The branches or stems are subcylindrical tubes about 

 11mm. in diameter; the walls are from 2-5 to 3 mm. in thickness; the cloaca 

 appears to be cylindrical, and continuous throughout the length of the sponge. 



The outer surface exhibits depressed circular or ovate apertures of blind canals 

 about 1 mm. in width, which have a generally vertical arrangement, though not in 



* Ann. & Mag. Nat. Hist. ser. 5, vol. vi. (1880) p. 212, t. 1413. f. 10, 11. 



