142 ELEVATED. 



(A. glabrata, fig. 455,), The Eburnse resemble in some respects 

 the genus Buccinum, but a glance at the figure will enable the 

 reader to distinguish a true Eburna from all other shells. Fig. 

 426 is Eburna Zeylanica. A catalogue of 9 species is given in 

 part 20 of the Conchological Illustrations published by the 

 Author, accompanied by figures of several species. 



ECHIDNIS. Montf. Described as a straight, chambered, annulated, 

 fossil shell, computed from the extremely gradual increase in 

 diameter of the fragments to be at least sixteen feet long. Found 

 in marble from the Pyrenees. 



ECIIINELLA. Sw. A sub-genus of Monodonta. Sw. Malac. 

 page 352. 



EFFUSE, (effiundo, to pour out.) The aperture of an univalve 

 shell is said to be effuse when there is a notch in the margin 

 which would suffer a liquid to escape, and thus prevent it being 

 filled to the brim. 



EGEON. Montf. A genus of microscopic Foraminifera. 



EGERIA. Lea. (Contrib. to Geol. p. 49, pi. 1.) A genus of 

 fossil bivalves, described as very variable in form, with or without 

 lateral teeth, sometimes a crenated margin, &c. The only certain 

 characters appear to be that they have two diverging cardinal 

 teeth in each valve, one of which is bifid ; and an external liga- 

 ment. Lea states that the Egerise should be placed between the 

 Sanguinolarise and the Psammobige, which two latter genera have 

 been united by Sowerby. Fig. 103, E. Triangulata, from the 

 tertiary formation of Alabama. 



ELENCHUS. Humph. A genus composed of Trochus Iris, 

 Auct. and other similarly formed species. It is the same as 

 Cantharidus of Montfort. 



ELEPHANT'S TUSK. The common name given by dealers to 

 shells of the genus Dentalium. Ex. D» octogonum, fig. 2. 



ELEVATED. A term which is applied by some conchological 

 writers to the spire of an univalve shell when it consists of nu- 

 merous whorls drawn out into a telescopic form. Other authors 

 use the term elongated, or the more simple one ' long* to express 

 the degree of elevation. 



