A treatise on malacology; or, Shells and shell fish . rse rib. dorsalis. Sow. Man. f. 50, 51. Teredo Linn. Shell tubular, irregular; the valvespholas-shaped, short and nearly orbicular. Teredo Linn. Valves resembling Xylophaga; placedat the thickest extremity of a long, irregular tube, which is open at both ends, the anterior end di-vided into two apertures furnished with two oper-cula.* {fig. 114<.k,l.) T. navalis. Sow. Gen. Man. f. 48, 49. Teredina. Tube clavate, irregular, nearly divided intotwo, by a projection on each side within, thus form-ing a double opening at the smallest extremit
A treatise on malacology; or, Shells and shell fish . rse rib. dorsalis. Sow. Man. f. 50, 51. Teredo Linn. Shell tubular, irregular; the valvespholas-shaped, short and nearly orbicular. Teredo Linn. Valves resembling Xylophaga; placedat the thickest extremity of a long, irregular tube, which is open at both ends, the anterior end di-vided into two apertures furnished with two oper-cula.* {fig. 114<.k,l.) T. navalis. Sow. Gen. Man. f. 48, 49. Teredina. Tube clavate, irregular, nearly divided intotwo, by a projection on each side within, thus form-ing a double opening at the smallest extremity;valves as in Teredo, but wholly external, incrustatedwith the tube, and having accessary valves. T. personata. Sow. Gen. Man. f. 46, 47. {fig. 114. i.) * I have not leisure to look into these characters, and have thereforeadopted Mr. Sowerbys account of this and the next genus. PART II, M Y AD^. SOLENINjE. 365 Family 2. MYAD^. Gaping Bivalves. Shells regular^ always with defined cardinal teeth;valves more or less gaping at one or both SuB-FAM. Salens. Shells generally linear, and always open at both extre-mities ; cardinal teeth distinct. SoLEN Linn. Shell very straight, broad, linear, and ofequal length throughout; umbones very small, ter-minal ; cardinal teeth small; ligament long, exter-nal. truncatus. Sow. Gen. f. 1. vagina. lb. f. 2. (Jiff. 116. b.) Ensatella Sw. Shell slightly curved. E. Eiuopea Stv. {Solen Ensis Auct.) NovAcuLiNA Benson. Straight, of equal lengththroughout; the extremities rounded; umbonestowards the middle ; cardinal teeth ^; dorsal marginslightly thickened. N. Gangetica. Sow. Man. f. 63. 366 SHELLS AND SHELL-FISH. PART II. Lepton Turton. Small, nearly round ; umbones cen-tral ; teeth ? The cardiform type. L. squamosus. Sow. Man. f. 62. SoLENocuRTis. Shell depressed, thin, transverse, oblongovate; the valves slightly gaping at one extremity ;cardinal teeth and umbones nearly central. Solenella Sow^. Oval, compressed ; epidermi
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
