346 



POPULAR CONCHOLOGY. 



tula, and is accompanied, in the dorsal valve, by three 

 diverging internal plates ; shell regularly punctured ex- 

 ternally ; pearly, fibrous, and slightly striated internally. — 

 Fossil. 



This description by Mr. Sharpe was published under the 

 name of Trematis two years before D'Orbigny's Orbicella, 

 and therefore ought to have the precedence, though 

 Philippi places the latter first. Mr. Sharpe's account is in 

 the Journal of the Geological Society, vol- iv. p. 68. 



Family 6.- — LING ULIDJE. 



The mouth arms are fleshy, without any shelly support. 

 The valves of the shell have no hinge, are almost equal, 

 lengthened, covered with a horny epidermis, sometimes 

 the shelly layer is so thin that the shell is flexible, almost 

 cartilaginous ; they have a thick peduncle proceeding 

 from between the two bosses, of a fleshy character. 



Lingula. Brug. — Shell thin, either horny, or cal- 

 careous, equivalve, equilateral, somewhat 

 peaked at the apex, generally open at the 

 base ; valves destitute of a hinge being 

 supported by their muscular adhesion, and 

 attached by a thick fleshy peduncle pro- 

 ceeding from between the bosses. Ani- 

 mal with two long ciliated arms, curled 

 up during repose. — 7 species ; also fossil. 



Mr. Cuming met with considerable 

 numbers of these shells in the Philippines, 

 where the inhabitants use the mollusc as 

 food. Thev are generally found in hard 



J o v Lingula anatina. 



sand at low water. 



Obolus. Eichwald. (Ungulites Pander; Aulonotreta 



