264 BHOMBUS. 



EEVEESED or Sinistral Shells, are those in which the aper- 

 ture is on the left side of the shell, while it is held with the 

 mouth downwards, and towards the observer. Ex. Balea, fig. 

 296. Attached bivalves are said to be reversed, when the left 

 valve is free, instead of the right ; a circumstance which some- 

 times occurs in Chama and Ostrea. 



EHEDA. Humph. Hyal^a, Lam. 



EHINOCLAVIS. Sw. A genus of " Cerithin»," Sw. thus de- 

 scribed : " channel curved backwards, in an erect position ; inner 

 lip very thick, with a tumid margin ; pillar generally with a 

 central plait ; operculum ear-shaped ; Hneatum. En. M. 443, fig. 

 3, Vertagus. lb. f. 2, subulatum. Lam. Wo. 23, fasciatum. 

 Mart. 157, f. 1481. obeliscus, En, Meth. 443, f. 4 ; aluco, lb. 

 f. 5, (aberrant,) semi-granosum. lb. 443, f. 1, asperum. Mart. 

 157, f. 1483. 



EHINOCUBUS. Montf. A genus of microscopic Eoraminif era, 



EHmODOMUS. Sw. A genus of " Scolymin*," Sw. thus 

 described : JN"o internal grove ; shell clavate ,• the spire longer 

 than, or equal with the aperture; the whorls with ridges or 

 longitudinal varices, and rendered hispid by transverse grooves ; 

 inner lip wanting ; pillar with a terminal fold ; aperture striated ; 

 outer lip with a basal sinus. E-. senticosus, Chem. tab. 193, f. 

 1864—1866. 



E/HIZOEiUS. Montf, A genus described from a microscopic 

 shell, appearing to be a cylindrical Bulla, 



EHODOSTOMA. Sw. A sub-genus of " Turbinise," Sw. 

 p. 344, 



EHOMBOIDAL. (po/j-jSoEidoe, r/iomboeidus.y Having a rhombic 

 form, i, e, four-sided ; two sides meeting at acute, two at obtuse, 

 angles. Conchologista are not very strict in the application of 

 this term, for, indeed, a perfect rhomboidal figure could not be 

 fon^d among shells. 



EHOl^BOIDES. Bl. A genus described as resembling Byssomya 

 as to the shell, but differing as to the animal. Mttilus rugosus, 

 Gmelin. HypoGiEA barbata, Poli. 



EHOMBUS Montf. {poiiftog, rhombos, a. rhomb.) A genus con- 



