III. DIST. CHAR. Prototype. 97 



74. FULCIMENTAL (fulcimcntale) a reliquium 

 deriving its form from a fulciment (v. page 

 102. Note f.) 



those already in use the structure of some fossil shells varying 

 considerably from that of the recent kinds, even of the same ge- 

 nus particularly in the anomite and nautili. 



Shell. (Testa.) 

 MULTIVALVE (multivahis) consisting of more pieces or valves 



than two. 



BIVALVE (bivalvis) consisting of two pieces or valves. 

 HINGE (cardo) the joint on which the valves move in opening and 

 shutting. 



We consider it as including the inferior margin, or that edge 



of the shell which lies between the beaks the ligament (hymen. 



Linn.} or the membrane connecting the valves, and covering the 



anterior chink (rima anterior. Linn.) the posterior part (amis. 



Linn.) of the shell, immediately behind the beaks, and which often 



takes a depressed or concave form and the teeth (dtntes) or 



eminences with which the inner surface of the hinge is set. 



c.)Compact(coarctaws) close or pressed together between the beaks 



not externally flat or spreading. The hinge in most shells 



is compact: the term is used in describing the anomita tfnd 



arcitte, in opposition to patulous. 



Patulous (patulus) externally flat and broad between the beaks ; 



as iii certain anomitce, &c. 



b.) Extended (extentus) long; running the whole length of the 

 shell; as in solenitce, many of the anomite, &c. (car do 

 longitudinalis. Linn.) 

 Short (curtus) not extended. 



c.)Straight (rectus) forming a straight line, (basis transversa. L.) 

 Curved (cnri'Ms)bent; inclining more or less from a straight line. 

 (sectus) divided, in the larger valve, by a slit or narrow 

 opening, which forms, when the valves are united, a triangu- 

 lar foramen, between the beaks; as in-many of the straight- 

 hinged anomita, c. 



o 



