362 Bibliographical Notices. 



Pedum cox(B corpore fusse. Pleopoda posteriora tria duplicatis 

 partibus divisa. Telson cyliadraceum. 



Mao'ocephalus longirostris, n. s. 



M. cephalo perlonge rostrato (rostro corporis totius f longitudinem 

 sequante). Antennis s\i\iQX\orW)\i^ rudimentariis. Gnathopodis pri- 

 mi et secundi parium chelatis. Caipis dactylorum apice productis. 

 Presented by Sir E. Belcher. 



Pleustes, n. g. 



Cephalon rostro productum. Antennce superiores quam inferiores 

 lougiores. Coxcb anteriores quatuor permagnee. Gnathopoda sub- 

 sequalia et subcheliformia. Pleopoda posteriora iu duplicatis parti- 

 bus divisa. Telson squamiforme. 



Pleustes tuber culata, n. s. 



P. pereii segmentis omnibus, plei anterioribus duobus tuberculo 

 dorsali medio ornatis. Pereii segmentis posterioribus tribus, plei 

 omnibus lateraliter tuberculatis. Segmentis pereii omnibus, 

 2)lei anterioribus duobus coxarum marginibus tuberculatis. Pe- 

 reiopodis posterioribus tribus coxis tuberculatis. Pleopodis pos- 

 terioribus appendice iuteriore permagno. 



Amphitoe lacertosa, n. s. 

 Ut genus sed gnathopodo secundo permagno et chelate. 

 Arctic regions. 



Lysianassa bidenticulata, n. s. 



L. antennis inferioribus superiores non superantibus. Gnathopodis 

 paris primi propodo carpo longiore. Gnathopodis paris secundi 

 carpo propodo longiore. Plei segmento tertio raargine posteriori 

 denticulis duobus utrinque producto. 



BIBLIOGRAPHICAL NOTICES. 



The Ground beneath us : its Geological Phases and Changes. By 

 J. Prestwich, F.R.S. &c. London : J. Van Voorst. 1857. 



The geological researches of Mr. Prestwich and their results have 

 been long vpell known and fully appreciated. Many years has he 

 devoted to the elucidation of the history of the Tertiary deposits of 

 this country ; nor have his investigations been in vain, or unproductive 

 of useful consequences ; for his researches, independently of their 

 scientific bearings, have been also of a practical kind, as is evinced 

 in the publication of his useful work, ' The Water-bearing Strata of 

 the Country around London*,' a notice of which appeared iu a pre- 

 vious Number of this Journal. 



* Van V^oorst, 1851. 



