Un trattato di malacologia; o, conchiglie e guscio pesce . Gli inferni sono facilmente distinguibili da theexperienced malacologist al primo sguardo, non è soeasy per definire loro dalle parole. La loro vera caratteri,comprendiamo, sarà trovato nell'animale. Theydiffer da tutte le altre note volute, essendo alwayswithout scultura, e generalmente lucidati come il Mar-ginellce. L'apice della guglia varia esattamente nello stesso modo come in genere Harpula : nel capo tipo,rappresentato da S. undulata, è piccolo e obtuselypointed. In fusiformis, è decisamente di spessore; ein papulosa, diventa superiore a

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A treatise on malacology; or, Shells and shell fish . hells are readily distinguished by theexperienced malacologist at the first glance, it is not soeasy to define them by words. Their true characters, we apprehend, will be found in the animal. Theydiffer from all other known volutes, by being alwayswithout sculpture, and generally polished like the Mar-ginellce. The apex of the spire varies precisely in thesame way as in the genus Harpula : in the chief type, represented by S. undulata, it is small, and obtuselypointed. In fusiformis, it is decidedly thick; andin papulosa, it becomes exceedingly large and round.A shelly deposition is often formed in mature age, atthat part of the outer lip which joins the spire, andalso on the pillar side of the aperture : there is a con-stant propensity, in short, to this thickening of thepillar, even in shells which usually have their plaitsdistinct. The first advance to this structure, afterleaving the last genus, is by a very singular fossil shell, described by Lamarck as the Buccinum strombioides. 11. ( fig. 12. a, b.) Mr. G. B. Sowerby, in adopting this name, justly observes, that, but for the absence of folds on the 124 SHELLS AND SHELL-FISH. PART I. pillar, its characters are more like those of a volute thana Stromhus. One circumstance, however, not noticed byeither of these writers, must be here mentioned : thewhole shell is covered with a thin coat of shining enamel, as in some of the recent Scaphellce, particularly thickat the top of the outer lip. This is always apparent;while, in old ones, there is also a thick deposition onthe upper part of the inner lip, which spreads over allthe under side of the body-whorl. This, in fact, is buta slighter developement of that greater thickening ofenamel seen in the last shell we spoke of, —namely, theVolutilithes rarispina; and is precisely what mightbe expected in any type which was to connect it withthe genus Scaphella, The absence of plaits on thepillar of this interesting shell (w

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• bookcentury1800
• bookdecade1840
• booksubjectmollusks
• bookyear184