182 BRITISH PALAOZOIC 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. Soypn1a TuRBINATA, Lonsdale (non Goldfuss). 
1840. Trans. Geol. Soc., ser. 2, vol. v, pl. 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. SPHMROSPONGIA HOSPITALIS, Salter. 
1873. Cat. Cambrian and Silur. Foss. Cambridge, p. 40. 
This species is not congeneric with Spherospongia 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. Srucanopictyum Carteri, M‘Coy. 
72. STEGANODICTYUM CoRNUBICUM, M‘Coy. 
1855. Brit. Pal. Foss., pl. ii, 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 
Scaphaspis respectively (‘ Quart. Journ. Geol. Soc.,’ vol. xxiv, p. 546). They are 
found in hard slates of Devonian age, at Polperro, Cornwall. 
