THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL. 



3V' DECEMBER 1823. 



LXXXII. The Specific Characters of several undescribed Shells. 

 By W. SwAiNsoN, Esq. F.E. S,- L.S. ^c* 



To the Editors of the Philosophical Magazine a7id Journal. 



TJURSUANT to the intention which I expressed in a for- 

 -■■ mer Number of your Magazine (vol. Ixi. p. 376), I now 

 proceed to describe the characters of several rare shells which 

 have recently come under my inspection, and of others which 

 I am led to think have not been well understood. 



1. Strombus Tliersites. 



S. testa ponderosa ; anfractu basali gibbo, deformi ; spira at- 

 tenuate, tuberculata ; labii exterioris integri margine crasso, 

 inflexo, recto, apertura laevi. 



Shell ponderous, body whorl gibbous, deformed ; spire atte- 

 nuated, tuberculated ; outer lip entire, the margin thick, 

 inflexed, and straight; aperture smooth. 



Size and habit of S. Accipiter ; but the spire is longer in pro- 

 portion, the body whorl destitute of grooves, or compressed 

 nodules, and the outer lip is considerably inflexed, very 

 thick, and attached to the first spiral whorl. The back 

 is swelled and has a distorted appearance. It is a large 

 and exceedingly rare shell. Of the two specimens I have 

 met with, one is in the Cracherodian collection of the Britisli 

 Museum ; and, if I am not mistaken, is stated in the MS. 

 catalogue to be a native of New Caledonia : the other is hi 

 the cabinet of Mr. Broderip under the name by which I 

 have recorded it. 



2. Strombus ^aZ^cfws. 



S. testa magna, ventricosa, inermi, transversim sulcata ; spira 



brevissima ; labio exteriore integro, supra rotundato, dila- 



tato, in spiram ascendente. 

 Shell large, ventricose, unarmed, transversely grooved ; spire 



very short ; outer lip entire, above rounded, dilated, anil 



ascending on the spire. 

 This Stromhus has long been known to collectors in its young 



* Coiiiniunicatt'd bv the Author. 

 Vol. U2. No. 308. Dec. 1823. ' 3 E state: 



