498 Analytical Notices of Books. 



posed some time since by Mr. Gray, and the characters formerly given 

 of them are repeated in the text. 



Only three Annulose animals are noticed. Two of these are repre- 

 sented as constituting a new type among the Coccidcs, to which the name 

 of Ceroplastes is assigned, with the following characters, " Mas. Coc- 

 " cis similis ? Foem. inflata, cerifera, pellucida, laminis 7 tecta, pari- 

 " bus 2 lateralibus, unica centrali dorsali, 1 anterior!, aUa denique pos- 

 " teriori ; laminarum marginahum nucleo infero subraarginali, dorsalis 

 " subcentrah." Both the new species comprehended under this de- 

 scription are from South America, and appear to be closely allied to 

 those which produce lac. The other annulose animal is also new, and 

 forms a new subgenus of NebaliadcR among the Crustacea ; Ceratas- 

 Pis, " Thorax maximus, tuberculatus, animal contractum on)nino in- 

 " cludens ; abdomen articulis 7, ultimis 2 longis, reliquis annularibus ; 

 *' ultimo paribus 2 pinnarum caudalium ; pedes 12 vel 14, longi, graciles, 

 " cihati, appendiculati ; antennse longissimae, setacese; oculi magni, pe- 

 " dicellati, appi'oximati.' The only species, which is designated as 

 the Cer. monstrosus, is from the Coast of Brasil. 



Among the Radiata Mr. Gray describes five species of Siphunculus, 

 Linn., three of which appear to be new ; and characterizes a new genus, 

 Themiste, which seems to be intermediate between Siphunculus and 

 Holothuria, with the former of which it agrees in internal organisation. 

 He also characterises Isaurus, an Actiniadous genus indicated by 

 M. Savigny, of which several species are figured in the Description de 

 I'Egypte, but which had not been previously defined ; zind describes a 

 new species. He also gives a character and description of a new species 

 of LunuUtes, Lam., interesting as the first recent race hitherto noticed 

 in that group. 



The materials selected by Mr. Gray for illustration in the present part, 

 which, it is stated, will be succeeded by others at irregular intervals, are 

 chiefly from the stores of the British Museum. 



