}3i Amilj/tkal Notices of Books. 



laevis, viridi-fusca. Apex mamillaris. Spira brevis. Coiumelhi 

 vix recta, 3-4-plicata, plicis uiagnis, acutis. Labium externum 

 baud reflexum. Basis profunde emarginata. Apertura hians. 

 Operculum nullum. Caput grande, planum, tentaculis laterali- 

 bus, remotis, oculis pone tentacula positis, magnis. Branchiae 

 satis magnae, dextra major. Pallium mediocre. Pes maximus, 

 ovalis." The animals of this genus resemble those of the pre- 

 ceding in being carnivorous, and in inhabiting the seas of the 

 warmer regions of the old world. The species are divided into 

 two sections, 1. "Spira inermi," including only the M. Indiciis 

 (V. Meloy Auct.^ which is figured, together with its young 

 state, F. Praputium, Chemn. and 2. " Spira spinis fornicatis 

 armata," embracing six species, and illustrated by the figure of 

 a new one under the name oi M. umbilicatus. 



For the characters of, and observations on, the two preceding 

 genera, Mr. Sowerby acknowledges himself indebted to W. J. 

 Broderip, Esq. who has kindly in part anticipated the information 

 he is about to publish in his Monographs of the Volutidce, for 

 which his extensive collection "affords the most ample and satis- 

 factory materials. 



Pi'LLASTKA, in which are included the Venenipes of Lamarck, 

 together with such of his Veneres as are allied to V. pullastra^ 

 is thus defined by Mr. Sowerby : " Testa aequivalvi, transversa, 

 inaequilaterali, latere antico breviore, dentibus cardinalibus in 

 utrS-que valva tribus contiguis, interdum apicibus subemargina- 

 tis. Impressiones musculares duae laterales, subrotundatae. Im- 

 pressio muscularis pallii sinu magno. Ligamentum externum, 

 valvarum marginibus dorsalibus suboccultatum." It is illus- 

 trated by figures of the P. vulgaris, Venus PiiUastra, Auct., of 

 P. litterata, and of P. papilionacea. 



The new genus of Cirripeda is described under the name of 

 Catopuuagmus : " Testa subconica, apice pervio, basi adhaj- 

 rente, (valv^ testacea clausa ?) valvis octo, inaH|ualibus, late- 

 raliter adjunctis, composita ; valvis porro plurimis per series 

 externas, circulares, gradatim niinores, confertim co-ordinatis. 

 Operculum bipartitum, valvis quatuor, anticis majoribus, compo- 

 situni." As in the new genus Octomeris established by Mr. 



