Excerpt from American Journal of Conchology, 1867, Vol. 3
In the monograph of this genus in Reeve's Conchologia Iconica, this Species is confounded with Swainson's P. Ovatus. It is, there fore, I think, possible that a specimen of my Species has never yet reached Europe, and none but the typical specimen has, to my knowledge, been brought to this country. I will therefore indicate the differences between the two Species, and I am con fident time will prove them to be distinct. The present Shell is lighter, more ventricose, Shorter or higher, with a more promi nent summit and ventricose umbo, and is more obtuse posteriorly within, the hinge differs in being narrower under the apex, and the teeth more regular except. At the posterior end of the cardi nal line. These teeth are very much compressed single and acute, whilst in the ovatus they incline more to be double the posterior cicatrix is separate, even distant from the impression above it, but in the ovatus these scars are broadly conﬂuent. Another distinctive mark is the anterior end Of the cardinal line, which suddenly becomes much contracted over the cicatrix and is toothed finely nearly to the cardinal extremity. In all the Specimens of ovatus that I have seen the cavity Of the umbo is deeply tinged with dark green over a wide Space, but in the allied species this part of the interior is pure rosaceous, and the only green is a bright Spot under the anterior hinge margin, a dull larger stain beneath it, and another small stain near the posterior ventral margin.
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