148 EGEE.TA. 



of the animal. The shell is characterized by a small septiform 

 plate under the hinge within. Fluviatile, Europe aad Africa. 

 PI. ix. fig. 159. 



EBUENA. This name belongs to the species "glabrata," de- 

 scribed in this book as an Ancillaria. '* Latrunculus" is given 

 by Gray for the present genus. Ancillaria glabrata, fig. 455. 

 {Eburneus),ivoTj. Fam, Purpurifera, Lam. Entomostomata, 

 Bl. — Descr. Oval, thick, smooth, turrited, umbilicated ; spire 

 angulated, acute, nearly as long as the aperture ; aperture oval, 

 terminating anteriorly in a canal, posteriorly in a groove ; outer 

 lip slightly thickened with an anterior notch, which terminates 

 in a spiral fold surrounding the body whorl; umbilicus generally 

 covered by the thickened columeUar lip. —06*. (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. Pig. 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, annu- 

 lated, fossil shell, computed from the extremely gradual increase 

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

 Pound in marble from the Pyrenees. 



ECHINELLA. Swainson. A sub-genus of Monodonta. Sw. 

 Malac. page 352. 



EFPUSE. (ef undo, 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 Poraminifera, 



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

 fossil bivalves, described as very variable in form, with or with- 

 out 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 exter- 

 nal ligament. liea states that the Egerise should be placed 



