OBSERVED AT MOGADOE. 187 



boscidale (Lam.), with little raised points or pustules, apparently 

 caused by the entanglement of grains of sand in the glazed ena- 

 melled outer coating of the shell during its deposition. The spire 

 does not rise above the top of the outer lip or aperture ; and the 

 very small low mammillary cone is nearly obliterated by the glazed 

 enamel of the rather broad and oi>en concave sutural channel, and 

 completely sunk or hid below the keel or margin of the same, as in 

 Sowerby's ff. 7 c, d. The sutural channel is deep and concave, but 

 wider in this individual than in the var. /3 with the retreating, 

 rounded, inflexed shoulder. The outer lip is outwardly promi- 

 nent, and the aperture effuse downwards, as in Sowerby's 

 ff. 7 c, d, which also exhibit exactly the general shape and colour 

 (a plain dark fawn, approaching to tawny-chestnut) of this Moga- 

 dorian example. The pillar is 3-plaited, and the inner lip strongly 

 defined and thickened, being formed by a distinct, enamelled, 

 smooth raised coat or band, half an inch broad, paler than the 

 rest, along the ventral margin of the aperture. 



Of all recorded species this Mogadorian shell certainly comes 

 nearest on the whole to C. rubiginosum (Swains.) ; and then to 

 G. porcinum (Lam.), with which it agrees in the sharp angle of 

 the shoulder, but differs in the distinct thickened inner lip, of 

 which there is ordinarily no trace in C. porciuum (Lam.), the 

 latter being also a thinner, lighter shell, more closely allied with 

 G. prohoscidale (Lam.), to which indeed it is united by Dr. Gray, 



p. incurva ; shoulder or top of outer lip rounded, incurved and 

 retreating; sutural groove deep and narrow, with the edge in- 

 flexed and rising above the obsolete short mammillary cone or 

 spire ; shape oblong or cylindric, with the outer lip mostly straight 

 and the aperture rarely effuse. — Le Pidlin, Adans. 48. t. 3. f. 2 ; 

 Buonan. 3. f. 2. 



The only adult Mogadorian example I possess of this variety is 

 3f inches long and If inch broad, agreeing remarkably well in 

 all respects with Adanson's Philin above quoted. In three small 

 immature examples from the same locality, measuring respect- 

 ively 1:^, If, and 2f inches in length, and 8, 12, and 16 lines in 

 width, the broad, blunt, short and rounded apical mammilla is 

 exserted above the shoulder or basal volution, and the shell is out- 

 wardly bluish-grey, clouded and mottled with pale spots. The 

 smallest of them has only two plaits on the pillar ; but in aU of 

 them the inner lip is distinctly developed on the body of the last 

 volution, and the usual rich chestnut or tawny-brown colour per- 



13* 



