108 Mr. Jeffreys on British MoUusca. 



Margarita pusilla (Trochus), ii. 534. Arran, N. B. (Rev. Mr. 

 Normari). 



M.? costulata (Skenea?), iii. 167. Mr. Bean informs me that he 

 has obtained a specimen of this very rare shell from Lamlash Bay, 

 in the west of Scotland. 



Lacuna crassior, iii. %"] . Weymouth {Mr. Thompson) ; Hunstan- 

 ton {Rev. Mr. Norman). 



Assiminia littorea, iv. 26.5. This occurs rather plentifully in Serk, 

 and near the Chesil Bank, off the Isle of Portland ; and I had oppor- 

 tunities of verifying the description of the animal as given by the 

 late Professor Forbes, at the same time with that of A. Grayana, 

 specimens of which Dr. Halley kindly sent me alive for that pur- 

 pose. Both are decidedly Pectinibranch. A representation of the 

 tongue of each will be found in PI. III. figs. 12 & 13. Philippi 

 seems most strangely to have given a very diflferent account of the 

 animal of ^. littorea (both in Wiegmann's 'Archiv' and in his 

 own work on the Sicilian Testacea) as regards the position of the eyes. 

 His Truncatella littorina is evidently the same species ; and I have 

 it from Sardinia and the coast of Piedmont. It appears to be allied, 

 both conchologically and by its habits, to some shells in the British 

 Museum collected by Mr. Macgillivray, and presented by the Admi- 

 ralty, which are stated to have been found in Norfolk Island on 

 stones at high-water mark. 



Rissoa striatula, iii. 75. Whitesand Bay ; Clyde district (Rev. 

 Mr. Norman) . 



R. abyssicola, iii. 86. A shell which Mr. Alder received from 

 Professor Love'n under the name of " Rissoa sculpta,'' and^VmAXy 

 forwarded to me for examination, unquestionably belongs to this 

 species, which, as well as R. cimicoides, appears to have been mis- 

 taken for the R. sculpta of Philippi. Love'n has not given in his 

 work any description or diagnosis to identify his species, to which 

 he referred that of Philippi. 



R. cimicoides. R. sculpta^ B. M. iii. 88 (non Phil.). Exmouth 

 (Mr. Clark). 



R. rufilabrum, iii. 106. Weymouth (Mr. Thompson). 



R. labiosa, iii. 109. The solid variety from Helford, Cornwall; 

 the thin, from Herm (Rev. Mr. Norman). A dwarf and thin variety 

 is also found in Arnolds' pond, Guernsey. 



R. inconspicua, iii. 1 1 3. Specimens of this variable shell, which 

 were rcceivetl by Mr. Alder from Professor Love'n, under the name 

 of " Rissoa ulbella,'" and by the former forwarded to me for exami- 

 nation, appear to agree with our variety albula. 



R. ventrosa, iii. 138. Clevedon (Rev. Mr. Norman). 



R. subumbilicata. Turho subumbilicatus, Mont. Test. Brit. ii. 

 316. R. ulvce, var., B. M. iii. 142. Southampton and Guernsey. 

 This appears to be a different species from R. ulvce, with which it is 

 found. The shell is more oval and slender, and the last whorl is 

 much larger in proportion to the rest. But further observation is 

 desirable. 



R. denticulata. Turbo denticulatus, Mont. T. B. ii. 315. Mr. 



