INTERNAL LIGAMENT. 175 



INFERIOE VALVE is that wHch is attached to sub-marine 

 bodies. Only applied to attached bivalves. 



INFEEOBHANCHIATA. Bl. The fourth family of the second 

 section of Paracephalophora Monoica, Bl. containing no testa- 

 ceous mollusca. 



INFLATED. SweUed, as Bulla, fig. 250, 252. This term can 

 only be applied to rotund shells of a light, thin texture. In other 

 cases we should use the word Venteicose. 



INFLECTED. Turned inwards. This term is applied to the 

 outer lip of a spiral shell when it turns towards the body whorl. 

 This is the case in Cyprsea, fig. 446. See E-efleoted. 



INFUNDIBULUM. Montfort, 1810. (A funnel) A genus 

 formed of those species of Caltpte^a, Lam. which, having 

 a spiral septum, so nearly resemble Trochus that some authors 

 have placed them in that genus. One species named Patella 

 Trochiformis. Eecent from South America, fossU from the 

 tertiary beds. Calyptrsea (Infundibulum) Pileus. PI. xii. fig. 

 237, 238. 



INNER LIP. That edge of the aperture of an univalve shell 

 which is near to the imaginary axis, as distinguished from the 

 outer lip, or that which is on the opposite side. 



INOCEEAMTJS. Sow. Fam. Malleacea, Lam. Margaritacea, 

 Bl. — Bescr. Thick, inequivalve, sub-equilateral, triangidar, deep, 

 with the umbones incurved ; hinge formed of a series of trans- 

 verse grooves, — Obs. The larger valves of these fossil shells 

 resemble the larger valve of G-ryphsea ; but the hinge is quite 

 distinct. The species described in Mineral Conchology are 

 found in the blue marl, at Folkstone, and in the chalks I. La- 

 marckii, (CatilluSj Brong.) PI. x. fig. 167. 

 INTERNAL CAST. The mould of a fossH sheU, composed 

 of matter which entered the shell in a soft state, and has 

 subsequently hardened, when, the shell dropping oif, the 

 hardened substance which filled it is left to represent its inter- 

 nal form. 

 INTERNAL LIGAMENT. A term used by some conchological 

 writers signifying that the ligament of a bivalve shell is placed 



