FISSURELLIM. 219 



55. Guadalotjpensis (f. 09), Soirb. — Ovata, depressa, irregu- 

 laris, rugosa, apice subcentrali, costis radiantibus magnis quarum 

 tribus posticis majoribus, duabus anticis maximis, cum alteris in- 

 termediis et parvis ; costis coucentricis irregularibus ; interstitiis 

 foveolatis ; fissura parva, cicatrice in costam elevatain producta. 

 Obs. If such a shell as E. Pankiensis were flattened, it would 

 present an appearance resembling this species. 



56. OCTOKADIATA (f. 66), Gmel. — Ovata, conica, patelliformis, 

 costata, alba vel albo-virescente, anticeintiis caualiculata, margine 

 subemarginato, costis octo eminentioribus. Obs. The eighth ray 

 is formed by the cicatrix of the fissure, which ends in a slight 

 notch at the margin. 



57. depressa (f. 64, 65, 6S), Blalnv. — Patelliformis, alba, 

 ovato-oblongii, lateraliter depressa, costata, costis novem eminen- 

 tioribus; striis transversis clathratis. 



58. B.UGOSA (f. 92, 93, 95, 96, 97, 98, 99, 100, 101, 102), 

 Q,iwii. — Elongato-ovalis, oblique comca, costis radiantibus, ele- 

 vatis, distantibus, asperulatis, interstitiis costellis lougitudinalibus 

 et lineis scabriusculis valde cancellata ; vertice subcentrali, postice 

 inclinato; aperturse margine dentato-crenulato, incisura profunda, 

 iutus in canalem product;!. Obs. In the whole of the varieties 

 figured, which have received so many names, we see only the 

 same general characters with different degrees in the asperity of 

 the ribs, resulting from the age of individuals and other modifying 

 circumstances. 



59. pulchra (f. 50, 51), A. Adams. — Depresso-conica, viridis, 

 albo pulcherrime radiatim picta, vertice subcentrali, postice in- 

 clinato, costis radiantibus, iusequalibus aculeato-asperis, intersti- 

 tiis lineis elevatis transversis clathratis ; aperturre margine denti- 

 culate), antice inciso, fissura brevi subquadrata. Obs. This re- 

 sembles the sharper and younger specimens of E. rugosa, but all 

 the radiating ribs iu the anterior half of the shell are equal. 



60. stellata (f. 103), A. Adams. — Solidula, albida, elliptica, 

 depresso-conica, apice subcentrali ; costis elevatis, subspinulosis, 

 radiantibus ; interstitiis costellis et striis crebris decussantibus, 

 esasperatis; apertura; margine dentato, sinu sublaterali, intus in 

 canalem apicem versus producto. Obs. This differs from any 

 of the varieties of E. rugosa in the production of the ribs at their 

 marginal termination, and the greater coarseness of the sculpture 

 generally. 



61. suxcifera (f. Si, 85), A. Adams. — Ovalis, depresso-conica, 



