LAMPRODOMA. Sw. A genus of "Olivinæ," Sw. thus described:--"Mitriform; spire produced, conic; resembling MITRELLA in shape, but the suture is channelled; the aperture effuse at the base, contracted above; lower half of the pillar with 6 to 7 plaits. Volutella, Zool. Ill. ii. series, pl. 40. f. 1. (_fig. 86._ )" Sw. p. 321. LAMPROSCAPHA. Sw. A sub-genus of "Anodontinæ," Sw. thus described:--"Shell not winged, elongate, pod-shaped; teeth none; bosses near the anterior extremity. Tropical America only? L. ? elongata. _Sw._ Zool. Ill. i. 176. ensiforme, _Spix._ Braz. Test. siliquosa. Braz. Test. pygmæa. Ib." Sw. p. 381. LAMPROSTOMA. Sw. A sub-genus of Canthorbis (Trochus), described at p. 350, Lardn. Cyclop. Malac. LAMPUS. Humph. TEREBRATULA, Lam. LANCEOLATE. Lengthened like a lance. LANISTES. Montf. Reversed species of AMPULLARIA, fig. 319. LAPLYSIA. See APLYSIA. LAPLYSIACEA. Lam. (properly Aplysiacea) A family belonging to the first section of the order Gasteropoda, Lam. containing the genera Aplysia and Dolabella. Fig. 254, 255. LARVA. Humph. FISSURELLA, Lam. LATERAL. (_Latus_, a side.) The lateral teeth are those which, taking their rise near the umbones, proceed to some distance towards the sides of the shell; as distinguished from the cardinal teeth, which receive their full developement close to the umbones. Lateral muscular impressions are those which are placed at a distance from each other, on the opposite sides of the shell. LATIAXIS. Sw. A genus of "Eburninæ," Sw. corresponding with the genus Trichotropis. Sow. (Sw. Malac. p. 306.) LATIRUS. Montf. A genus composed of species of FUSUS, Auct. which have an umbilicus and are turriculated. LAURIA. Gray. A sub-genus of PUPA, containing P. umbilicata, &c. (Gray's Turton, p. 193.) LEGUMINARIA. Schum. A genus composed of species of SOLEN, Auct. which have an internal longitudinal bar or rib. Fig. 61. S. Radiatus, Lam. LEILA. Gray? Described as having the hinge edge smooth like Iridina, but having a "sharp siphonal inflexion." (Syn. B. M. p. 142.) LEIODOMUS. Sw. A genus of "Buccininæ," Sw. consisting of Terebra vittata and other similar species. This genus corresponds with Bullia, Gray. LEIOSTOMA. Sw. A genus of "Fusinæ," Sw. thus described, "Equally fusiform," (with Fusus) "but ventricose in the middle; shell entirely smooth, almost polished; inner lip thickened, and vitreous; base of the pillar very straight. Fossil only. (_fig. 75._) L. bulbiformis. En. Méth. 428. f. 1." LEMBULUS. Leach. A genus composed of oval species of NUCULA, resembling N. margaritacea, fig. 137. LENDIX. Humph. PUPA, Lam. LENGTH. See MEASUREMENT. LENTICULAR. (_Lens._) Of a circular, convex form, as Pectunculus, fig. 134.