n." 



498 Anal^ical Notices vf Books, 



'>.. > ■ P 



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

 of them are repeated in the text. , ' ' 



Only three Annulose animal?, are noticed. Two of these are repre- 

 sented as constituting a new type among the Coccidce, to which the i\ame 

 of Cero PLATES is assigned, with the following charactera, " Mas. tJoc- 

 " cis similis.^ Fcem. inflata, certfera, pgllucida, laminis 7 tecta, pari- 

 " bus 2 lateralibus, unica centrali dorsali, 1 anteriori, alia denique pos- 

 " teriori ; laminarum marginalium nucleo infero submarginali, dorsalis 

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

 scription are from South America,j^^d appear to be closely allied to 

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

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

 Pis, " Thorax maximus, tuberculatus, animal contractum omnino i^ 

 " cludens; abdomen articuhsi?, ultimis 2 longis, reliquis annularibus ; 

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

 " ciHati, appendiculati ; antermae longissimse, setaceae ; oculi magni, pe- 

 " dicellati, approximati." The only species, which is designated as 

 the Cer. moiistrosus, is from the Coast of Brasil. % ^^ 



Among the Radiata Mr. Gray describes five species of Siphun^ulus, 

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

 Themiste, which seems to be intermediate li^tween Siphunculus and 

 Holothuriaf with the former of whi^h it agrees in internal organisation. 

 He also characterises Isaurus, an Actiniadous genus indicated by 

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

 I'Egypte, 'l)ut which had not been previously defined ; and describes a 

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

 of LunulitSs, Ciam., interesting as the first recent* race hitherto noticed 

 in that group. -^ ' " ,^. 



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

 which, it is stated, vnll be succeeded by others at irregular intervals,- ^e 

 chieffy from the stores of the British Museum. ^. 



