"MONOMYAEIA. 203- 



"■ used in a general sense to include the classes Cbncliifera and 

 Mollusca of Lamarck, corresponding with the type Malacozoa of 



- De Blainville. 



MONET COWET. Cypraea Moneta, which passes current in 

 some parts of Africa and the East Indies. 



MONILEA. Sw. A sub-genus of Monodonta. Sw. p. 352. 



MONOCEROS. Lamarck. Acanthiza, Eischer. (Movog, monos, 

 single ; Kepac, ceras, horn.) Fam. Purpurifera, Lam. — Descr. 

 Ovate, thick, covered with a brown epidermis ; spire short, con- 

 sisting of few whorls ; aperture emarginated anteriorly ; colu- 



- mella rather flat ; outer lip thick, with a prominent tooth near 

 the extremity.- — Obs. This genus resembles Purpura, in every 

 respect, except in having the tooth from which the name is de- 

 rived. A catalogue of 16 species by Mr. Sowerby, sen. is pub- 

 lished with figures of 14, in parts 58 to 67 of the Conchological 



■ Illustrations by the author. The species belong to the South 

 American coasts of the Pacific Ocean. Priority is claimed for 

 the name Acanthiza (Pischer, 1807) for this genus. PL xix. 



•fig. 417. 



MONOCONDTL^A. D'Orb. A sub-genus of Uniones, de- 

 scribed as equivalve, inequilateral, sub-rotund or angulated; 

 hinge consisting of a large, obtuse, roimd cardinal tooth in each 

 valve, with no lateral teeth. MonocondylsB (TJnio) Paraguay ana. 

 PL viii. fig. 149. 



MONODONTA. Lam. Odontis, Sow. A genus separated 

 from Trochus, Auct. on account of the tooth or notch with 



-which the columella abruptly terminates. M. labeo. PL xvi. 

 fig. 366. 



MONOICA. Bl. The second sub-class of the class Paracepha- 

 lophora, PL divided into the orders Pulmobranchiata, Chismo- 

 branehiata, Monopleurobranchiata, in the first section ; and 

 Aporobranchiata, Polybranchiata, Cyclobranchiata, Inferobran- 

 chiata, and Nucleobranchiata, in the second. 



MONOMYAEIA. Lam. {Mopog, monos, single ; fivoy, my on, 



muscle.) The second order of Conchifera, consisting of those 



' bivalve shells which have but one principal muscular impression 



