EPIDEEMIS. 151 



Konig. This genus is described as a small tube, within a larger 

 one, the smaller extremity of the inner tube projecting beyond 

 that of the outer one. Deshayes, who describes this genus, ex- 

 presses a conviction that the soft parts of the animal must be 

 entirely different from those of the animal of Dentalium. The 

 genus Phaeeteitjm, as described by Konig in his " Icones Fos- 

 silium Sectiles," is evidently identical with Entalis. It is placed 

 by him in the family of Pteropoda, but being a fossil shell, there 

 is some difficulty in finding its place in the system. See plates, 

 fig. 3. 



ENTELLITES. Fischer. A genus composed of species of Teee- 

 BEATTJLA, SpiEiEEE, and Peoductus, Auct. having the hinge 

 large and the umbones short. Oethis ? Dalman. 



ENTIEE. (Integra.) Not interrupted, not emarginated. The 

 peritreme of a univalve shell is said to be entire when not inter- 

 rupted by canals or by the body whorl. Ex. Cyclostoma, fig. 

 304. The paUeal impression is entire, when continued without 

 interruption, or without a sinus. 



ENTOMOSTOMATA. Bl. The second family of the order 

 Siphonibranchiata, Bl. The shells of this family are described as 

 differing but little from those contained in the family of Sipho- 

 nostomata of the same author, both with regard to the soft parts, 

 and their testaceous covering. This family partly answers to 

 the PurpurifersB in the system of Lamarck, and contains the 

 genera Subula, Cerithium, Melanopsis, Planaxis, Terebra, 

 Ebuma, Buccinum, Harpa, Dolium, Cassidaria, Cassis, Eicinula, 

 CanceUaria, Purpura, Concholepas. 



EOLIDES. Montf. A genus of microscopic Eoraminifera. 



EPIDEEMIS. (Eirt, epi, over or upon ; Zepua, derma, skin.) The 

 fibrous, horny, external coating of shells, called by the Erench, 

 " Brap marin" or marine cloth. Lamarck objects to the name 

 Epidermis, because he does not consider the substance as answer- 

 ing to the cuticle or scarf skin of the human body, but more 

 analogous to the nails and hair. Gray calls it the Peeiostea- 

 CUM, from the membranous skin covering the bones of quad- 

 rupeds. 



