STROMBUS. 



TESTA oblonga, turrita, subventricosa, basi in 

 canalem brevem, emarginatum vel truncatum 

 desinens. Apertura plerumque elongata, su- 

 pern^ in canalem brevem, interdum supra spi- 

 ram elongatum, extensa. Labium externum 

 aetate ampliatum in alam simplicem, integram, 

 superne lobatam, infernfe lacuna a canali dis- 

 tincta interruptum. 



Thb only characters^ by which Stromhus is distinguished 

 from Pteroceras, are its winged outer lip not being divided 

 into digitations^ and its short basal canal ; and these we 

 apprehend are sufficient to distinguish it from the few 

 genera to which it is related. There are^ indeed^ two or 

 three species of Strombi, which yery nearly resemble some 

 of the JRostellarice, but the situation of the sinus near the 

 lower end of the outer lip may be regarded as the distin- 

 guishing mark. Upon the whole, Stromhus may be con- 

 sidered as well marked a Genus under the Lamarckian 

 system, as it was a family under the Linnean ; its species 

 having scarcely ever been arranged under other genera, 

 and species of other genera having very rarely been con- 

 founded with it. We can only charge our memory with 

 one instance, in which a small species of Stromhus has 

 been generally placed as a Murex; it is published by 

 Sowerby in the Mineral Conchology, under the name of 

 Murex Bartonensis, (M, C. t. 34.) 



The Strombi are in general oblong shells, with a 

 more or less acutely turrited spire ; sometimes they are 

 rather- ventricose, and their base generally terminates in 

 a short emarginated or truncated canal. The aperture 

 is mostly elongated, rather more so than that of the 

 Rostellariae, and terminated at its superior extremity by 



