Mr. Jeffreys on British Mollusca. 127 



R. Alderi, n. s. PI. V. fig. 5 a-c. 

 Testa ovato-conica, solidula, nitida, lutea, strigis transversis creber- 

 rimis subflexuosis exilibus insculpta ; anfractibus 5, convexis, sen- 

 sim increscentibus ; sutura profunda ; apertura subrotunda, superne 

 acutangnlata ; labio fere contiuuo, coluraellae adnato ; umbilico 

 parvo, angusto ; long. ^, lat. -J^ unc. 



Only three specimens have occurred to me, in dredged sand from 

 Skye, which was procured by Angus M'Nab, and in which I also 

 found the two species of Proteonina described and figured by Prof. 

 Williamson of Manchester in his elaborate and valuable monograph 

 on the British Foraminifera. R. Alderi differs from R. soluta of the 

 British Mollusca (with which it was found) in being more than twice 

 the size, in the conical form of the spire, and in the peristome not 

 being continuous. 



R. vcntrosa, var. muriatica, iii. 140. Guernsey, in abundance on 

 JJlva lactuca {Mr. Lukis, sen.). 



Jeffreysia diaphana, iii. 152. Paignton. 



J. opalina, iii. 158. With the last. 



Skenea nitidissima, iii. 158. With the last two. 



Aporrha'is pes-carbonis, iii. 136. Mr. Barlee says that the animal 

 of this species differs from that o^ A. j^es-pelecani (both of which he 

 has examined and compared together) in the following particulars. 

 The entire snout and tentacula o{ A.pes-pe/ecani are of a dull brick- 

 colour, while the snout of A. pes-carbonis is bright scarlet, with 

 a snow-white opake line running all down the centre, and termi- 

 nating thus J , — the tentacula being of the same colour as the rest of 

 the animal (viz. watcry-svhite), with an opake snow-Avhite line down 

 the centre to the very tip of each. The snout of this last species is 

 also flatter and narrower than that of A. jJespe/ecmii ; and its foot is 

 long, narrow, and almost pointed when extended on the march. 



Cerithium reticulatum, iii. 192. var. sine varicibus et spira bre- 

 viore. From deep water, Guernsey ; the ordinary form being littoral. 



Cerithium Metaxa. Murex Metaxa, Delle Chiaje, Mem. (1823) 

 vol. iii. p. 222. t. 49. f. 29-31. Cer. Metaxa (i). Wood's Crag 

 Moll, part 1. p. 71. Cer. angustissiinum, Forbes, Rep. on M^. 

 Inv. 190. Specimens, though rare, and in a more or less imperfect 

 state, have been found at Guernsey by Mr. Norman, Mr. Barlee, and 

 myself. ISIr. M'Andrew has taken it by dredging off Tenerifte, and 

 Pantellaria in Sicilv ; a<id I also obtained it by the same mode in the 

 Gulf of Sj)ezzia. Having examined Mr. Searles Wood's specimens 

 of what he doubtfully considered Delle Chiaje's species, I am satisfied 

 as to the specific identity of the fossil and recent sbells. Delle 

 Chiaje notices ihcfour transverse ribs, which is one of the charac- 

 teristics of this species. It is the Cerithium creperum of Mr. Wood's 

 earlier Catalogue of Tertiary Fossils. The accompanying repre- 

 sentation (PI. V. fig. G fi, h) is taken from a Piedmontese specimen, 

 which is much more j)eilict than any other that I have seen. 



Scalaria Turtonis, iii. 204. Guernsey (Dr. Jjukis). 



S. communis, iii. 206. In dredged sand from Guernsey. 



