SMITTIA LANDSBOROVII. 345 



(on Polyzoa from Nova Zembla), identifies his Escha- 

 rella porifera with Lepralia pertiisa, Busk ; but the latter, 

 which seems to be little known in the North, is certainly 

 referable to another group. 



I have had much difficulty in unravelling the synonymy 

 of this species, and suspect that the Scandinavian natu- 

 ralists have associated with it some northern varieties 

 which are not known on our coasts. I should refer all 

 the forms assigned by Smitt to his E. porifera to 

 S. Lcmdsborovii, with the exception of those represented 

 in his plate xxiv, figs. 40, 41, which I cannot identify, 

 and the one which he names forma edentata. This seems 

 to be a distinct species ; and I have elsewhere characte- 

 rized it as Lepralia reticulato -punctata. 



Habitat. On shells, stones, &c., from moderate depths 

 to deep water. 



Localities. South Devon ; Cornwall, 30 fathoms, on 

 Sertularia abietina ; ofi" the Great Orme's Head (the erect 

 form) ; Guernsey (T. H.) : Hastings (Miss Jelly) : Scar- 

 borough (Bean) : north coast of Northumberland, erect 

 (Embleton) : Ayrshire (D. L.) : Peterhead, rare (C.W. P.) .- 

 Shetland, very rare; the Lepralian state on a stone from 

 170 fathoms (A. M. N.) : Antrim (Hyndman) : Birterbuy 

 Bay (G. S. B.). Yar. porifera. South Devon (T. H.). 

 Var. crystallina. The Miuch ; Shetland, 80-140 fathoms 

 (A. M. N.) : off the coast of Antrim (Hyndman). 



Geographical Distribution. Durban, Natal, on 

 oyster shells (W. Gates): Australia (T. H.)*: Florida, 

 176 fathoms (Pourtales) : Greenland (North- German 

 Pol. Exped.) : Arctic Seas (Smitt) . Var. porifera. Davis 

 Strait, ofi' Frederickshaab, 100 fathoms (Wallich). Var. 



* In the Australian specimen, which I have examined, the cells are ovate, 

 lined round, thickly punctured o\er the entire surface, and with three or 

 four marginal spines. 



