12 1- Miscellaneous. 



On the other hnml, the general form of the animal, the manner of 



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

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

 bancea), that if it was not for the })cculiar jiosition of the eye on its 

 long ])edicel I should have heen inclined to have considered it as a 

 suI)division 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 Cyclostoma, or rather Ilelicina, 

 while the Littorince and TruncateU<e have well-develo])ed gills for 

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

 of Littorina and TruncafeUa 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. II. and A. Adams, in the number of their work 

 issued since this pa])er was read, arc 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 MoUusca, 313. 



MISCELLANEOUS. 



ON CLAUSILIA ROLl'HII AND MORTILLETl. 



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

 Gruppen der Europaischen Clausilien,' containing tlic groups allied, 

 severally, to 67. venfricosa, Dr., pficatidrr, Dr., rvyosa. Dr., and to 

 the true r/racilis, llossm., and placing 67. venfricosa, RoJpliii, Leach, 

 and tumiduy Ziegl., in the first group, while lineolata. Held, jjUcatu/a, 

 Sec. arc assigned to the second. 



I am also indebted to ^Ir. Woodward for a further supply of Claii- 

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

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

 Cheltenham, and assigned by A. Schmidt to CL 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. Bliitter ' of the present year. 

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

 did not ajjply to 67. lineolata, he had finally arrived at the con- 

 clusion that the i)late presented a better outline of the form of the 

 shell to which he had referred under the name o{ Morti/leii, and 

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

 England, where 67. lineolata had not been detected. Clausilia 

 Ito/phii therefore aj>pears as a substantive species, with CL Mortilleti 

 as a synonym. 



On a review of the single large specimen first received from 

 Mr. Woodward, and wliich I regarded as the type of 67. Rolphii 

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

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



