LUCINOPSIS. 189 



near Eochester, Kent. The specimen is in Mr. Wetherell's 

 collection. 



LOEIPES. Poll. A genus composed of a species of LuciiirA. Auct. 

 in whicli tlie cartilage is wLolly internal, Ex. Lucina divaricata. 



LOTOEIUM. Montf. 1810. A genus composed of species of 

 Teiton, Auct. in wHcli tlie aperture is eiFuse. T. Lotorium, 

 PL xviii. fig. 400. 



LOTTIA. Gray, 1833. Patelloida, Quoy and Gaimard. 



LUCEENA. Humph. A generic name appKed to some species 

 of Helix included in De Eerussac's sub-genus Helicogena. 



LUCEENELLA. Sw. A genus of " Lucerninffi," Sw. thus de- 

 scribed : "Teetli on both sides of the aperture ; surface regularly 

 and distinctly striated. Circumference convex." 



LUCIDELLA* Swainson, 1840. Helicika or Oligtra, species 

 contracted near the outer lip. H. aureola. Thesaurus Conchy- 

 liorum, PL i. fig. 43, 4, 5. 



LUCIDTJLA. Sw, A sub-genus of " Lucerna, Humph, thus 

 described : " Aperture transverse, both lips much thickened and 

 united ; the outer with marginal obsolete teeth at the base ; 

 umbilicus closed. Barbadensis, Lam. No. 49. p. 78. Eer. Moll. 

 pL47, 2, 3, 4." 



LUCINA. Brug. 1792. Fam. Nymphacea, Lam. Conchacea, BL 

 Descr. Equivalve, inequilateral, orbicular, lenticular, radiately 

 striated ; hinge with, generally, two minute cardinal teeth, which 

 are sometimes nearly obsolete, and two lateral teeth, on each 

 side of the umbo in one valve, one in the other; ligament exter- 

 nal, partly hidden by the margins of the valves when closed. 

 Muscular impressions two in each valve, the anterior one pro- 

 duced into an elongated, ligulate band, the posterior short and 

 semi-rotund ; impression of the mantle not siuuated. — Obs. The 

 shells of this genus resemble Amphidesma ia general form, but 

 are distinguished by the external ligament, the elongated mus- 

 cular impression, and the want of a siaus in the palleal impres- 

 sion. East and "West Indies, and European shores. L. Tigeriaa. 

 PL V. fig. 104. 



LTJCINOPSIS. Eorbes and Hanley. Nov. 1848. Venus undata 



