182 BRITISH PALEOZOIC SPONGES. 



connecting with it. No perforations are shown in the surface tubercles. The 

 interior structures are entirely obliterated, and the nature of the organism is 

 altogether doubtful. 



From shelly limestone (Permian) at Humbleton Hill and Dalton-le-Dale, 

 Durham. 



69. Scyphia tuebinata, Lonsdale (non Goldfuss). 



1840. Trans. Geo). Soc, ser. 2, vol. v, pi. lviii, fig. 9. 



I have not seen the type-specimen, the only description states : " Two pyritous 

 specimens, embedded in slate, from the vicinity of Plymouth." Judging from 

 the figure their characters are highly problematical. They are not likely to 

 belong to Goldfuss's species from the Upper Jura of Streitberg, in which they have 

 been placed by Lonsdale. 



70. Sphjseospongia hospitalis, Salter. 



1873. Cat. Cambrian and Silur. Toss. Cambridge, p. 40. 



This species is not congeneric with Splicer ospongia tessellata, Phill., and 

 probably it is related to the genus Pasceolus, Bill., in any event it is not a Sponge. 

 The original is from the Middle Bala Group at Onny River, Shropshire. 



71. Steganodictyum Caeteei, M'Coy. 



72. Steganodictyum coenubicum, M'Coy. 



1855. Brit. Pal. Toss., pi. ii a, figs. 1— 4. 



These forms, regarded by the author as Sponges, were pointed out by Salter 

 to be the cephalic plates of a Pteraspidian fish. This conclusion was fully 

 confirmed by Prof. Ray Lankester, who has referred them to Cephalaspis and 

 Scaphasjjis respectively ('Quart. Journ. Geol. Soc.,' vol. xxiv, p. 546). They are 

 found in hard slates of Devonian age, at Polperro, Cornwall. 



