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ART. XVI. — Notes on Shells, with Descriptions of new Genera and Species. By 



T. A. Conrad. 



CASSIS. 



C. coRNUTA, Lin. Two species of Cassis have been confounded by authors since 

 the time of Linne, under the name of C. cornuta, one of which inhabits the East, the 

 other the West Indies. Linne gives the latter habitat, but his reference is solely to 

 figures of the eastern shell, and it is therefore probable that his description was taken 

 from that species, though the name better applies to the other, which is really horned 

 when old, whilst the eastern shell has much shorter and more numerous tubercles : 

 these never become so greatly unequal in size as in the former species, which shell 

 is well represented in Chemnitz's figures, 1790 and 1791. 



Reference to Cassis cornuta, as figured in the works of various authors. 



Lister, t. 1006 f. 70, and t. 1009, fig. 71, c. 



Bonani. Recr. 3, f. 155. 



Rumph. Mus. t. 23, fig. 1. 



Petiv. Gaz. t, 151, fig. 9, Buccinum brevirostrum, and 7, fig. 14, Cassis Amhoinensis. 1713. 



Gualt. Test. t. 40, fig. D. 



Seba. Mus. 3, t. 73, figs. 7, 8, 17, 18. . 



Knorr. PI. 3, 2**, fig. 1. 



Favanne. Conch. PI. 26, fig. A, 1. 



Martini. Conch. 2, t. 33, figs. 348, 349, and t. 35, fig. 362. 



Kiener. Spec, des Coq. p. 9, No. 4, PI. 2, fig. 3. 



Wood. Index Test. pi. 22, fig. 14.? 



Reeve, Conch. Icon, part 65, PI. 1, fig. 2. 



Chenu. Illus. Conch. PI. 2. 



C. Labiata, Chemnitz. The only certain figures of this species I have seen, are 

 those in Chemnitz's and Lister's works. Reeve has pointed out the difference 

 between this shell and the eastern cornuta of Lin., but regards it as only a variety 

 of that species. Surely when characteristic differences are so prominent and 

 persistent, in shells so remote in their habitats, it is fair to conclude that they cannot 

 be identical species. 



The figures usually referred to the one in question by authors, in the works of 

 Rumphius and Petiver, appear to me to represent Cassis tuberosa, Lam. 



