150 ENTAXIS. 



ELLIPTICAL. (EWei-^te, ellipsis.) Oval. Applied to any shell 

 or part of a shell, having that form. 



ELMINEUS. Leach. Order, Sessile Cirripedes, Lam.— Descr. 

 Eour unequal valves, arranged circularly side by side, forming 

 a quadrate cone ; aperture large, sub-quadrate, irregular ; oper- 

 culum composed of four valves, in pairs. — Obs. This genus 

 differs from Conia in the structure of the shell, the latter beiag 

 porous. Elmineus Leachii. PI. i. fig. 22. 



ELPHIDITJM. Montf. (Conch. Syst. t. 1. p. 15.) A genus 

 of microscopic Eoraminifera. 



EMAEGINATED. (e, out ; marffo, border.) Notched or hol- 

 lowed out. Applied to the edges or margins of shells, when 

 instead of being level they are hollowed out, as the outer lip 

 of Oliva, fig. 457, at the base, and the ventral margins of some 

 bivalves. 



EMAEaiNULA. Lamarck, 1801. (e, out ; margo, border,) Fam. 

 Calyptracea, Lam. Branchifera, Bl. — Bescr. PateUiform, oblong 

 or oval ; anterior margin notched or emarginated ; apex pos- 

 teriorly iaclined ; muscular impressions wide. — Obs. Emargimila 

 elongata, of some Authors, Paemophoeus of De Blainville is 

 commonly called the Duck's bUl limpet, from its shape. The 

 Emarginulae may be known from PateUse and other neighbouring 

 genera, by the notch or slit in the anterior edge. In the genus 

 Eimula, Defr, fig. 243, this slit is near the apex, and does not 

 reach the margin. Eecent species occur in all climates, but are 

 not numerous. EobsU species are stiU more rare, occurring in the 

 Calcairegrossier, Crag and Oolite. E. fissurata, PL xii. fig. 241. 



ENDOSIPHONITES. A genus composed of Ammonites, having 

 the siphon close to the body whorl. PI. xxii. fig. 476. 



ENDOTOMA. Eafinesque. A genus of microscopic Eoraminifera. 



ENOPLO CHITON. Gray. Chiton niger, &c. 



ENROULEES. Lam. See Convolute. 



ENSATELLA. Swainson, 1840. Ensis, Schum. 1817. 



ENSIS. Schum. 1817. Solek ensis. Auct. and similar species, 

 fig. 60. 



ENTALIS. Defr. Desttalitjm duplicatum, Bl. Phaeetkium, 



