210 EBURNA. 



a regular chaniu'l out of Avhicli arises the preceding whorl : The 

 s|)ec'ies are all hirgely umbilicate, but in some of them the um- 

 bilicus is covered or filled, more or less completely by the callous 

 inner lip : the umbilical region is defined by a strong rib. A 

 thin, dark brown epidermis, sometimes translucent, covers the 

 living shell, but cabinet specimens are usually denuded of this, 

 exhibiting upon an ivory-white surface, spots and maculations 

 of orange-red. The aperture is usualh' white, sometimes tinged 

 with violet upon the columella. This pattern of coloring is most 

 uniform throughout the genus ; but the species are distinguished 

 by modifications of the arrangement of these color spots, as well 

 as by the diflerences of shoulder and umbilicus. None of the 

 species are strictly "banded, although in some the coloring coal- 

 lesces into irregular revolving masses. The coloring reminds 

 one sti'ongly of Phasianella,*^ whilst the shell, except for the want 

 of its characteristic groove and tooth recalls the genus Pseudo- 

 liva — one of the species of which was formerl}' erroneously 

 referred to this group. The surface of the shell is invariably 

 smooth, devoid of the sculpture of ribs, striie, tuberculations, etc. 

 The operculum is ample, filling the aperture. The Eburnse are 

 natives of the tropical seas of the Eastern hemisphere. 



If we observe the rule of taking the first species as the type of 

 a genus, Ehurna. Lamarck must become a synonym of Ancillaria, 

 his first species being A. glabrata: Lamarck's assemblage of 

 species, however, clearly indicate his intention. Naturalists have 

 done much to render science and themselves contemptible by 

 expending their time upon the nomenclature, instead of the 

 structure and habits of animals. Ebanui, Lamaick is well undei'- 

 stood and will answer m}^ purpose. 



I commence with those species showing the least shoulder, 

 ending with those in which it is most strongly defined. My 

 illustrations are mainly derived from Sowerby's Thesaurus Con- 

 chyliorum ; Reeve has also monogi-aphed the genus is his Con- 

 chologia Iconica. 



■* Or of the ecclesiastical groiip of ^litnu, sucli as M episcopalis, ponti- 

 ficalin, papalis, cardinalis, etc. 



