8 MUKEX. 



ridges, by the solidity of the shell, the thickness of the varices, 

 and other characters. 



32. Cailleti, Petit. — Having figured a species under this 

 name as attached to it in the Brit. Mus. Col. (see our fig. 

 22, 23), I did not see the figure in the Journal till after the 

 plates were made up. On examination I am now of opinion 

 that fig. 22, 23 must be added to f. 24 to represent M. 

 similis, and that M. Cailleti is a distinct species approaching 

 M. elegans, but more elongated and rugose. 



33. similis, f. 22, 23, 24, Sowerby. — Testa brevis, quad- 

 rato-subglobosis sublsevigatis, griseo-fulva, castaneo bifas- 

 ciata, inter varices infra angulum plicis tuberculiferis 

 tribus vel quatuor munitis ; varicibus angustis breviter 

 spinosis, infra aperturam breviter fimbriatis, canali dorsaliter 

 valde recurvo. — Smoother and with shorter body than M. 

 motachlla, and the canal curved rather towards the back than 

 sideways. The varices have not the flattened appearance 

 seen in those of the above. 



34. nodatus, f. 28, Reeve. — Testa subfusiformis, fulva, 

 inter varices trituberculata, spiraliter lirata, articulatim rubro- 

 lineata ; varicibus breviter spinosis ; canali breviusculo, late- 

 raliter recurvo. — The varical spines on the angle of the whorls 

 are sharp and produced, those round the mouth and the one 

 on the canal are also produced, but shorter. 



35. Antillarum, f. 209, A. Adams. — Testa fusiformis, 

 utrinque acuminata, alba, spiraliter tenuiter lirata, inter 

 liras tuberculosim triplicata ; varicibus angustis prominenti- 

 bus pone excavatis, spinis acutis armatis ; spira longiuscula, 

 anfractibus octonis, rotundatis, apertura subovata, margine 

 externo producto, crenulato, intus septemdentato ; canali 

 retrorsim curvo. — Nearly approaching M. nodatus, but more 

 compact, with the varices hollowed at the back, the spines 

 shorter, the mouth dentated, and the canal recurved, but not 

 obliquely. 



36. trilineatus, f. 26, Reeve. — Testa subfusiformis, medio 

 ventricosa, alba, spiraliter concinne lirata, rubro trilineata, 

 inter varices plicato-trituberculata ; varicibus rotundis, in- 

 ermis, pone excavatis ; spira pyramidata, anfractibus su- 

 perioribus angulatis ; apertura subrotunda, margine producto 

 crenulato, canali breviusculo, tortuosim recurvo. — A beautiful 

 shell, having the general form of the motacilla group, but 



