184 KEY. E. T. Lowe's list of shells 



Mrs. Elton's Mogadorian shells, amongst which I certainly oh- 

 served a few undoubtedly "W. Indian and other foreign species. 

 Its length is 12, breadth 4, and length of apert. 5-^ lines. 



67. Nerita Maroccana, Chemn. v. 270, t. 188. flf. 1905-1908 ; 

 Natica marocMensis, Lam. ed. 2. viii. 642 ; N. intermedia, Phil. i. 

 163 ; N. nitida (Don.), F. H. iii. 330, t. 100. ff. 2^. 



68. Sigaretus haliotoideus (L.), Lam. ed. 2. ix. 9; Helix lialio- 

 toidea, Linn. Syst. ed. 12. 1250 ; Hanley, Conch. Linn. 390. t. iv. 

 f. 7 ; Catinus lactis (white and flat var.), Mart. i. 196, 1. 16. f. 152 ; 

 Sigaretus Leacliii, Sowerb. Gren. f. 3 (not S. haliotoideus, f. 2, which 

 = , according to Hanley, Helix neritoidea, Linn., and also = , ac- 

 cording to Deshayes, ;S^. concavus, Lam., not Sowerb. I. c. f. 1, 

 which=, according to Deshayes, S. Grayi, Desh. in Lam. ed. 2. 

 ix. 12). — Le Sigaret, Adans. 24. t. 2. f. 2, appears by the figure to 

 belong rather to 8. neritoideus (L.) (S. haliotoideus, Sowerb.), than 

 to S. haliotoideus (L.) (^S*. Leacliii, Sowerb.), to which it has been 

 usually referred. 



My two Mogadorian examples of this shell, 12 and 15 lines long, 

 agree rather more closely, in the smaller proportionate length (5 and 

 Q^ lines) of the space occupied by the spire, with Sowerby's fig. 3 

 of his S. Leachii than with Hanley's fig. 7 (from the types) of 8. 

 haliotoideus (L.), in which the same spaces are respectively 5^ and 

 6^ lines, the whole length being 14 lines in each ; though, strictly 

 speaking, they are intermediate in this respect between the two. 

 But such slight discrepancies can scarcely be held to indicate more 

 than local, or possibly mere sexual differences. 



In a suite of twelve examples of this species from the coast of 

 South Carolina over against Charleston, the spire occupies a length 

 of 4 to 5^ lines, the whole length being in the smallest of these 

 examples 10, and in the largest 16 lines. In a thirteenth, from 

 the same locality, 15 lines long, and rather broader and more 

 convex than the rest, the spire is 7 lines long, which is almost 

 exactly the proportion in Hanley's fig. 7. t. 4, with which it also 

 agrees in the greater width of the penultimate volution. I believe 

 this to be the shell of a female individual, and that all the other 

 twelve examples, with the rather smaller spire and more flattened 

 or less concave shell, have probably belonged to males. 



69. This is Ilurex torosus. Lam. ed. 1. vii. 174, ed. 2. ix. 598 ; 

 Sowerb. Conch. lU. f. 39. 



Martini's two upper figures 1026, 1027 of his Vurpura sealata, 

 iii. 345. t. 110. flf. 1026-1028, referred by Lamarck to his M. EH- 

 nacetis, whicli is the ordinary foliated var. of British autliors. 



