AND OTHER FAMILIES. 171 



Cabinet of P. H. Nicklin. 



Cabinet of Baron Ferussac. 



Diam. 11, Length 1-8 inches. 



Remarks This superb Paluilina, which far surpasses in point of 



beauty any of our species yet known, I owe to the kindness of Judge 

 Tait. Its beautiful double tuberculated cincture at once distinguishes 

 it from all described species. Some specimens are furnished with 

 dark purple bands which beautifully decorate the interior of the shell, 

 and give a dark rich green colour to its fine epidermis. In the others 

 these are wanting, and the epidermis then has a clear and more yel- 

 low appearance. The sutures being formed immediately over the 

 lower row of tubercles, they cause its line to be very irregular ; and 

 this row itself is hidden on the upper whorls. 



SUPPLEMENT. 



Read before the American Philosophical Society, March 15th, 1833. 



SINCE I had the pleasure to present to this Society, nearly a year 

 since, a Memoir on the Naiades and some other families, I have had it 

 in my power to procure several interesting species, hitherto unnoticed 

 by naturalists. In the large collection of rare shells which I procured 

 in Europe while there last year, some of these were discovered ; and 

 most of them are, perhaps, the only specimens known, being now first 

 described. The observations on, and corrections of, Lamarck's Naiades, 

 it is hoped, will prove useful to the American conchologist. 



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