LITHODOMUS. 185 



tinder the name Physa, fig. 310. Other generic names have been 

 given to other species. PL xiv. 



LINES OF GEOWTH. The concentric stride or lines formed by 

 the edges of the successive layers of shelly matter deposited by 



. the animal by which it increases the shell. The outer edge 

 of the aperture is always the last line of growth. 



LINGrUIPORM. (Lingua, tongue ; forma, form.) Tongue-shaped. 



LINGrULA, Lam. 1801. (Dim. from lingua, tongue.) Fam. 

 Brachiopoda, Lam. PalLiobranchiata, Bl, — Descr. Equivalve, 

 oblong, depressed, thin, equilateral, gaping and pointed at the 

 umbones, gaping and truncate or trilobate at the opposite 

 extremities, attached by a fleshy pedicule fixed to the umbones. 

 — Obs. This is the only bivalve shell which is pedunculated, in 

 which respect it constitutes a singular anomaly. The ancient 

 writers, seeing the valves separate, placed it in their systems 

 under the name PateUa Unguis. There are several recent 

 species found in the Moluccas, and some fossils in sandy 

 indurated marl, and in alluvium of Sufiblk. L. Anatina, fig. 219, 

 is so named from its resemblance to a duck's bill. Mr. Sowerby's 

 Monograph of this genus in the Author's Thesaurus Conchy- 

 liorum contains 7 species. Plate 67. See our Plate xii. fig. 219. 



LINGrULINA. D'Orb. A genus of microscopic Poraminifera. 



LINTEELA.. Adams. Sowerby's Thesaurus, PL 11. 1850. A 

 sub-genus of BuUidse, the shells of which are thus described : 

 " oval, depressed ; aperture with a slight canal above ; inner lip 

 with a cup-shaped appendage, spiral within." 



LINTHUEIS. Montf. Conch. Syst. 2. 154. A genus of micro- 

 scopic Poraminifera. 



lilP- See Labium and Labrtjm. 



LIPPISTES. Montf. A genus of microscopic Poraminifera. ? 



LITHODOMUS. Cuv. {AiBoq, lithos, stone; Awfia, doma, house.) 

 Fam. Mytilacea, Lam. — Descr. Transverse, elongated, cylindri- 

 cal, equivalve, with the extremities rounded, and the posterior 

 extremity rostrated ; umbones not prominent, terminal ; hinge 

 straight, destitute of teeth ; ligament linear, most conspicuous 

 within ; muscular impressions two. — Obs. The shells composing 



