]98 EEV. E. T. LOWE'S LIST OF SHELLS 



566), in its coarser or stronger ribs, and more distinct and mostly 

 crenulated keel. 



Of all Eossmassler'a figures, tis H. caperata, ff. 830, 830 aa, and 

 832, best represent the present form, thougli not exhibiting the 

 coarser striae and subcrenulated keel. 



4. Helix JEumcBus, Lowe. 



T. aperte umbilicata parvula rotundato-depressa, supra convexiuscula 

 subtus planiuscula (nee turgida) arete et temiiter striata einerea, fiisco 

 ssepe obscure seriatim lentiginoso-maculata v. interrupte fasciata, 

 vertice fusco-eorneo laevi nitido ; spira convexiuscula vertice exserto, 

 sutura distincta impressa ; anfr. 4i-5 convexiusculis, ultimo depresso 

 obtuse cainnato antice nee deflexo nee dilatato, apertura oblique lunata ; 

 peristomate recto simplici acuto, marginibus remotis. 



Diam. maj. 5-6^, miu. 4i-6 ; alt. 3-44 millim. 



At the Emperor's Garden up the river, r. 



From the number of specimens collected, many of which are, 

 however, dead and more or less bleached or discoloured, this is 

 probably a common shell at Mogador, though its insignificant size 

 and unattractive aspect may well have occasioned its being appa- 

 rently hitherto overlooked. I find, however, two specimens 

 amongst a few other Helices collected at Mogador in 1851 by Mr. 

 T. S. Leacock of Madeira, and sent to me by Mr. Wollaston. Its 

 nearest ally seems to be S. apicina, Lam., and it also much re- 

 sembles H. armiUafa, Lowe ; but it is not less distinct from the 

 European than from the Madeiran species, differing from the latter 

 in the less distinct keel and less flattened last volution, which is 

 especially much more convex and rounded beneath ; in the much 

 less fine, close, and regular striation, and in the larger umbilicus. 

 In general colouring there is considerable approximation; but the 

 brown spots or interrupted tessellated bands are much more di- 

 stinct and regular in H. armiUafa. 



5. Helix Irus, Lowe. 



Possessing only two dead specimens of this apparently distinct 

 species, I shall not attempt at present to give its complete diag- 

 nosis. In general aspect much resembling IT. squalida, Lowe, it 

 is still more nearly allied to I£. Eumcsus, differing in having the 

 striae roughened more or less with fine seobinate asperities or raised 

 linear file-like granulations, after the manner of H. lentiginosa, 

 Lowe, and several other Madeiran species. The spire is also dis- 

 coidally flattened, with the penultimate volution alone abruptly 

 raised above the basal whorl, and the rest of the 4<^ volutions, 

 vdth the vertex, flat or even a little depressed, much as in H. 



