NOVACULINA. 203 



NITIDELLA. Sw. Agenusof "Columbellinse/'Sw. thus described: 

 " Bucciniform, small, ovate, smooth, glassy; aperture effuse; 

 outer lip slightly thickened, faintly inflexed, and generally stria- 

 ted iuternally ; inner lip somewhat flattened above ; base of the 

 pillar with one or two slight internal folds, or a single angular pro- 

 jection. Columbella nitida, Lam. (fig. 17, c. p. 151.)" Sw. p. 313. 



NOBIA. Leach. Order, Sessde Cirripedes, Lam. This genus 

 resembles Pyrgoma, Auct. consisting of a conical paries, supported 

 upon a funnel-shaped cavity in the madrepore, but differs in its 

 operculum, which consists of two valves, whereas that of Pyrgoma 

 has four. N. grandis, fig. 29. 



NODOSARIA. Lam. and Orthocera have been united by 

 Sowerby under the name of the first. Fam. Orthocerata, Lam. and 

 Bl. — Descr. Straight, chambered, elongated ; chambers more or 

 less ventricose ; septa perforated by a central siphon. — Obs. 

 This genus consists only of fossils found in sub-appenine tertiary 

 beds. It is placed byDe Blainville in one of his divisions of the 

 genus Orthoceras, which is characterized as "species not striated, 

 and with chambers very much inflated." N. sequalis, fig. 465. 



NODOSE. Having tubercles or knobs. 



NOGROBS. Montf. A fossil appearing from the figure and de- 

 scription to resemble Belemnites. 



NONION. Montf. A genus of microscopic Foraminifera. 



NONIONINA. D'Orb. A genus of microscopic Foraminifera. 



NOTREMA. Rafinesque. A shell described as composed of three 

 integral valves, concerning which Be Blainville puts the query, 

 " ne seroit-ce pas plutot une Balanide mal observee ?" 



NOVACULINA. Benson. {Novacula, a razor.) Fam. Solenacea, 

 Lam. — Descr. Equivalve, inequilateral, transversely elongated ; 

 external ligament communicating with the interior of the shell by 

 an oblique channel ; beaks prominent ; hinge line nearly straight, 

 with one narrow curved cardinal tooth in one valve, enteiing 

 between two simdar teeth in the other ; siphonal scar long ; extre- 

 mities of the shell gaping ; epidermis thin, light brown, folding 

 over the edges and connecting the dorsal margins. Ilab. Jumna, 

 Gooti, and Ganges. Fig. 63. 



