History of British animals - University of Guam Marine Laboratory

36S MOLLUSCA. ACEPHALA. Lingula.PEDUNCULATA.Gen. LINGULA.— Valves equal, oval, flat, without teeth orelastic ligament ; peduncle cylindrical and cartilaginous ;margin of the cloak fringedwith fine hairs.1. L. mytilloides.—Ovate, anterior end slightly truncated ; beak indistinct.2——Mussel, Ure, Ruth. 310. tab. xvi. 6—Sower." Min. Conch, t. xix. f. 1,Carboniferous Limestone Casts of a shell imbedded in shale in the coal formation,figured by Ure, Hist. Ruth, 310. t. xvi. f. 5., probably belong to aspecies of this genus. They seem to have a mesial ridge, with divergingstriae.2. L. tenuis.— Elongated, lanceolate, anterior end truncated.— Sower. Min.Conch, t. xix. f. 3.—London Clay.3. L. ovalis Depressed, oblong-oval, anterior edge circular, beak veryshort.—Sower. Min. Conch, t. xix. f. 4 London Clay ?Gen. XCI. TEREBRATULA.— Inequivalve, apex of thelargest valve perforated or emarginated for the passage ofthe circular ligament;hinge consisting of a projection oneach side the apex, and two elongated processesfor supportingthe arms on the smaller valve, projecting into thecavity.366.— T. cranium. — Shell ventricose, semitransparent, frontmargin slightly truncated ; surface finely shaggreened, andslightly wrinkled concentrically.Mull. Prod. 249. No. 300G Zool. Dan. t. xciv. f. 1 T. vitrea, Flem.Edin. Encyc.— vol. vii. DC. t. 200. f. 2. T, cranium, Mont. Linn.Trans, xi. 188. t. xiii. f. 2— Occasionally brought from deep water bythe cod-fishing-lines, Zetland.Length an inch and T l 25th, breadth, „ths less; brownish-white; the shaggreeningis remarkably delicate, and seen only by the help of a lens ;the lateralteeth of the large valves are bifid ;those in the small valve give originto the two projecting processes, which have a small tooth near their base,and project horizontally, upwards of three-fourths across the shell ; the concentricwrinkles of growth occur irregularly ; peduncle simple—To this probablybelongs the Anomia Tercbratula of Turton's Conchological Dictionary,p. 5.",where a reference is made to Da Costa's Elements, 292. t. vi. f. 3., andwhere it is stated that a single specimen was dredged up alive in Dublin Bay,and placed in the Museum of the Dublin Society.367. T. psittacea.— Shell oval, with regular fine longitudinalstriae ; the beak much produced and curved ; the margin waved.List. Conch, t. ccii. f. 46. Turl. Conch. Diet. 5. t. xi. f. 42. Biv. Brit.236.— Cast ashore, after a severe gale, at Teignmouth, where Dr Turtonhas since seen several fragments.