424 Miscellaneous, 



-^rfOn the other hand, the general form of the animal, the manner of 

 walking, and habitation of the genus Assiminia are so like those of 

 some of the smaller species of Lit torma (which Dr. Leach named Sa- 

 bancca), that if it was not for the peculiar position of the eye on its 

 long pedicel I should have been inclined to have considered it as a 

 subdivision of that genus, with very short tentacles and elongated 

 eye-peduncles. But Mr. Berkeley's observations have set that at 

 rest, as well as the distinction between it and Truncatella ; for he 

 shows that Assiminia has lungs like Ctjclostoma, or rather Ilelicinay 

 while the LittorincB and TruncatellcB have well-developed gills for 

 respiration, hke the greater part of the marine genera ; but the gills 

 of Littorina and Truncatella are very unlike one another, the gills 

 of the former being broad, short, laminar, and of the latter, single, 

 ovate, and pectinate. 



P.S. — Messrs. H. and A. Adams, in the number of their work 

 issued since this paper was read, are so impressed with the pecu- 

 liarity of the combination of characters that the animal presents, viz. 

 a pulmonary respiration, spiral operculum, and terminal eyes, that 

 they have formed for the genus a suborder named Prosophthalma, and 

 a particular family, Assiminiadce : see Genera of Mollusca, 313. 



MISCELLANEOUS. 



ON CLATJSILIA ROLPHII AND MORTILLETI. 



I HAVE lately received the first part of Adolf Schmidt's ' Kritischen 

 Gruppen der Europjiischen Clausihen,' containing the groups allied, 

 severally, to CI. ventricosa, Dr., plicatulay Dr., rugosa, Dr., and to 

 the trxiQ gracilis, Rossm., and placing CI. ventincosa, Rolphii, Leach, 

 and tumida, Ziegl., in the first group, while lineolata, Held, plicatula, 

 &c. are assigned to the second. 



I am also indebted to Mr. Woodward for a further supply of Clau- 

 silice found by Mr. Sharman at Charlton in Kent. These all prove 

 to be of the form found by Mr. Prentice at Chariton Kings near 

 Cheltenham, and assigned by A. Schmidt to CI. Mortilleti, Dumont. 

 Early in June I called M. Schmidt's attention to the fact of his 

 having altogether ignored CI. Rolphii, as a substantive species, in the 

 Prodromus published in the * Malak. Blatter ' of the present year. 

 It now appears that, after some doubt whether Gray's description 

 did not apply to CI. lineolata, he had finally arrived at the con- 

 clusion that the plate presented a better outline of the form of the 

 shell to which he had referred under the name of Mortilleti, and 

 which he had received from Mr. Prentice, through his brother, from 

 England, where CI. lineolata had not been detected. Clausilia 

 Bolphii therefore appears as a substantive species, with CI. Mortilleti 

 as a synonym. 



On a review of the single large specimen first received from 

 Mr. Woodward, and which I regarded as the type of CI. Rolphii 

 (Annals for July 1856, page 75), and on further examination of 

 A. Schmidt's amended characters, remarks and figure, I am disposed 



