EBURNA VMlentiana, 

 Arabian Eburna. 



Generic Character. 



Testa turrita, Icevis, nitida, timbilicata, baai truncata, cmarginatd. 

 Apertures angufus superior interne canaliculatus. Animal 

 marinum. 



Shell turrited, smooth, polished, umbilicated, base truncated, 

 emarginate. Upper angle of the aperture with an internal 

 channel. Animal marine. 



Generic Type Buccinum Spiratuiii L,in. 



Specific Character. 



E. testa xentricosii, maculatd ; aperturx longitudine spirce longitudi- 

 nem superante ; spird anfractibxis 5 conie.ris, suturis aheatis ; 

 basi balteo concavo cinctd. 



Shell ventricose, spotted ; spire shorter than the aperture, of five 

 convex volutions ; suture channelled ; base with a concave 

 belt. 



Eburna Valentiana. Sw. Appendix to Blig/i Cat. p. 6. lot 904. 



-T Ew species are known of EbiiriKC, and these are neither 

 well defined, nor correctly figured. 



The species selected by most authors as the type of this 

 ofenus is Buccinum orlabratum of Linnaeus, a shell which, as 

 it unites the characters of Eburna and u4neHia, should not 

 have been chosen for this purpose. Types of genera are 

 alone intended to represent the usual appearance of those 

 characters on which the genus has been founded ; they 

 should therefore be selected from such species only, as repre- 

 sent these characters in their perfect development. 



jE. Valentiana was first characterized by myself, in the 

 Appendix to the Bligh Collection. It was brought from the 

 Red Sea by Lord Valentia, in honour of whom it is named. 

 The very short spire and concave belt at the base, easily 

 distinguish this shell from E. spirala. 



I'l. 144. 



