24 CYPR^A. 



obtusis ; basi convexa ; apertura sinuata ; dentibus rotundas, 

 brevibus, circa 17 et 18; variat iuterstitiis dentium et ex- 

 tremitatibus vivide roseis. 



73. lenttginosa, Gray, (f. 151, 152, 153). — C. testa, quarn 

 G. Sowerbyi breviore, magis gibbosa, punctis sparsioribus ; 

 extremitatibus crassis, latis, lateraliter dorso foveolatim de- 

 pressis; apertura latiuscula. ; dentibus paucioribus (circa 15 

 tantum), distantibus, elongatis. 



Note. — 'Sowerbyi (maculata), zonata, nebulosa, and lenti- 

 ginosa. A history of the synonymy of the first is given 

 by Reeve, and amounts to this, namely, that Gray intended 

 to name the shell maculata, but withdrew that name on 

 the supposed discovery of its identity with zonata. Kiener 

 distinguishes the two species, not in his plates, but in the 

 text ; and as in the meantime the name maculata, had been 

 applied by Barnes to a variety of reticulata, it was dropped, 

 and the one above was given. As compared with Sowerbyi, 

 zonata is a much shorter and more gibbous shell, with a 

 more flattened base and extremities ; teeth narrower, inter- 

 stices wider; aperture wider. As for the zones, their ap- 

 pearance, more or less distinct, depends upon the stage of 

 development. Lentiginosa has some resemblance to zonata, 

 but the ends are thicker, and the teeth much fewer and longer. 

 Both it and nebulosa are much more obtuse at the extremi- 

 ties than zonata, and, on the whole, the four species may be 

 usefully kept apart. 



The following may be united under the name nebulosa : — 

 f. 198, 199, the normal form and colour as type; f. 354, 

 355, a brilliant little shell, unnamed in the British Museum, 

 clearly marked, rosy at the lips and between the teeth ; 

 f. 356, a larger shell, of which there are several specimens in 

 the British Museum under the name of Surinamensis. They 

 all have a similar thickness at the extremities, and in all the 

 basal enamel is extended over the sides, so as to confine the 

 dorsal area to a narrow disk. 



74. spadicea, Swains., (f. 81, 82). — C. testa pyriformi; ex- 

 tremitatibus crassis, productis, rotundis ; dorso spadiceo, ad 

 latera ustulato-fusco nebulato ; lateribus roseo-subcinereo- 

 albido ; basi rotunda ; apertura lata ; dentibus utrinque 

 circa 20, rotundis, brevibus. 



Many specimens are now known, pretty uniform in the 

 peculiar style of colouring, which, nevertheless, has an acci- 



