102 . III. DIST. CHAR. Prototype. 



2. External parts ; as 



a.) 78. Radical (radicate) having its form from 

 the root. 



cOlnvolute (involuti) revolving within, and, in a greajt measure, 

 hidden by the first or outward wreath. We believe, this is 

 not exactly the sense, in which the term is used by Linne. 

 Manifest (manifesti) more or less external; visible. 

 &.)Disjunct (disjunct^ disjoined; more or less distant from each 



other. 



Contiguous (contigui) close; not separate. 

 .)Extrinsic (ext rinsed} contiguous, but not inserted or indented 



one into another. 

 Inserted (inserti) each wreath received or indented, more or less, 



into that which surrounds it. 

 Slightly inserted (subinserti) almost extrinsic. 

 AMBIT (Ambitus) in depressed univalves, the circumference or 



back of the outward wreath. 



DISK (Discus) In depressed univalves, the surface on ach side 

 of the shell, exclusive of the ambit. The amonita give 

 examples in the use of the foregoing terms, a, b t c, c. 

 f FULCIMENTS. Vide pages 88 and 97. 

 The terms employed by Linne and other naturalists, in de- 

 termining the various species belonging to this tribe of animal bodies, 

 are numerous ; but we are net acquainted with any work, in which 

 a regular or scientific explanation of them has been given. The 

 following Tabular View of the parts, &c. of the Fukiment 

 (drawn p some years back to assist our investigation of the fossil 

 subjects) may not, therefore, be unacceptable to the student. We 

 must premise, however, that it is offered as a mere sketch, which 

 we should be happy to see improved and filled up, by the more ex- 

 perienced in this part of Natural History. 



The reader will observe, that we have not always adhered to the 

 terminology used by Gmelin in his descriptions of these zoophyta. 

 As, however, the edition of the Systema, which bears his name, is 



