ELLTPSOSToaiATA. 149 



between the Sanguinolariae and the Psammobise, which two 

 latter genera have been united by Sowerby. E. Triangulata, 

 from the tertiary formation of Alabama. PL v. fig. 103. 



EGLESIA. Grray. Eeeve's Monograph. (2 species.) Conch. 

 Iconica. " Shell elongated, turrited; whorls numerous; sutures 

 depressed ; columella flatly thickened ; squarely angled at the 

 base ; aperture small, rounded ; margins almost joined, not 

 reflected." Distinguished from Turritella by the angular de- 

 pression of the upper part of the whorls, and by the consequent 

 straightness of the outer lip. — Obs. There are certain species 

 of so-called Scalarise ; such as Sc. Australis, Sc. Diadema, Sc. 

 Crenata, &e. of Sowerby' s Thesaurus, which perhaps might be 

 added to this genus with propriety. See our PL sxviii. fig. 592. 



ELEJSrCHUS. Humph. A genus composed of Teochus Iris, 

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

 Cakthaeidtjs of Montfort. PL xxv. fig. 543. 



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. 



ELLIPSOLITHES. Montf. (EWeti/ztc, ellipsis, oval; XtOot, 

 lithos, stone.) A genus composed of Ammonites, which instead 

 of being regularly orbicular, take an elliptical or oval form. 

 This character appears to be accidental, as some individuals of 

 the same species, both of Nautilus and Ammonites, are round, 

 while others are compressed into an oval form. 



ELLIPSOSTOMATA. Bl. (EWei^te, ellipsis, oval ; an^iia 

 mouth.') The third family of the class Asiphonibranchiata, BL 

 The shells of this family are described as of various forms, 

 generally smooth ; the aperture longitudinally or transversely 

 oval, completely closed by a horny or shelly operculum. This 

 family contains the genera Eissoa, Phasianella, Ampullaria, 

 Helicina, and Pleuroceras. 



