MA-GTBA. ■ 191 



LTONSIA. Turt. Inequivalve, species of Anatina, Auct. whicli 

 have no spoon-shaped cavity in the hinge, but an accessary piece. 

 L. striata, PI. xsiv. fig. 491, 492. 



LTEIA. Svs^ainson. Yoluta Nucleus, Thesaurus Conchyliorum, 

 PL V. fig. 108. 



LTEODOJS". Goldf. Trioonia ? 



MACLUEITES. Lesoeur. Journ. des Scienc. Nat. Philad. t. 

 1. p. 312. pi. 13. fig. 2, 3. 



MACOMA. Leach. Yenits tenuis, Bl. and similar species, 

 described as " Clothed with an epidermis ; striated, compressed, 

 oval ; the summits not very prominent ; two bifid teeth upon 

 the right valve and a single undivided one upon the left." 



MACEODITUS. Montf. Lenticflina, Bl. A genus of micro- 

 scopic Toraminifera. 



MACEOSPIEA. Guild. 1840. Subultka, Beck, 1837. A genus 

 composed of Helix Octona, Auct. Ex. SubuHna octona, PI. xxv. 

 fig. 514. 



MACEOSTOMATA. Lam. (MaKpoQ, macros, long ; crrona, stoma, 

 mouth.) A family belonging to the fijst section of the order 

 TracheHpoda, the sheUs belonging to which are described as 

 haliotoid or ear-shaped, with a very large aperture, destitute of 

 an operculum. This family contains the following genera, which 

 may be thus distinguished. 



1. Yeltjtika. Globose, with velvety epidermis. Fig. 337. 



2. Stomatia. Ear-shaped ; pearly within ; including Sto- 



MATELLA. Pig. 335, 336. 



3. Stgaeettjs. The same, not pearly ; iucludiug Cryptostoma^ 



Pig. 334. 



4. CoEiocELLA. The same, thiu, transparent. 



5. PLaliotis. The same, not thin, nor transparent ; with 



holes ; iacluding Padollus. Pig. 338, 339. 



6. ScissTJRELLA. HeHciform, with a slit near the aperture. 



Pig. 340. 



7. Pletjeotomaeia. Trochiform, with a slit at the edge of 



the aperture. Pig. 341. 

 MACTEA. Linn. {Mactra, a kneading trough.) Fam. Mac- 



