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Chiton acutirostratus. Chit. testd elongatd, medio elevatd, latė- 

 raliter subcompressd, valvis summitate obtuso-carinatis, Icevibus, 

 utrinque creberrime planigranatis, umbonibus productis, acute ros- 

 tratis, valvarum areis lateralibus parvis, subindistinctis, concavis ; 

 albidd, summitate nigro hic illic inquinatd; ligamento corneo, 

 spicularum cristd parvd ad latus utrittscue valvce munito. 

 Long. 1^ poli. ; lat. i poli. 

 Hab. Cape Rivers. 



An elongated species, of somewhat angularly compressed growth, 

 remarkably distinguished by the sharply beaked structure of the 

 umbones ; the flatly-grained sculpture of the valves apjjroaches that 

 of C. hirudiniformis, to -vvhich it offers a singular contrast of colour. 



Chiton petasus. Chit. testd parvd, subabbreviato-ovatd, valvis 

 medio ared trigond subrostratd politd, utrinąue rugoso-granatis ; 

 viyide coccineu ; ligamento latissimo, prcecipue antice, quoque vi- 

 vide coccineo, setis pilisve brevibus hic illic obsito. 

 Long. 1 poli. ; lat. | poli. 

 Hab. Cape Rivers. 



A beautiful little bright scarlet shell enframed \vithin a broad 

 swollen ligament of the šame very striking colour ; in the form of 

 the ligament it is the nearest approach I have seen to that remark- 

 able species the C. Blainvillii. 



Chiton formosus. Chit. testd ollongd, siibangustd, valvis un- 

 dique subtilissime longitudinaliter striatis ; vivide coccined ; liga- 

 mento corneo, spicuUs vitreis nitide albis dense obsito, spicularum. 

 cristd densd erectd ad latus utriusgue valvce. 

 Long. ^ poli. ; lat. ^ poU. 

 Hab. Cape Rivers. 



_A most exquisite little species of a bright scarlet colour, surrounded 

 with dense tufts of white shining glassy spiculae. Of this and the 

 two preceding species only a single specimen of each vvas obtained. 



Cardium Bechei. Card. testd subcordato-ovatd, medio et antice 

 IcBvigatd, striis minittis superficiariis radiantibus et concentricis 

 sub lente decussatd, epidermide tenui corned nitente in funiculis 

 fibrisve concentricis creberrime dispositd ; ared posticd, epidermide 

 nulld, radiatim costatd, costis tenuibus, confertis, qmnque et viginti 

 ad triginta, spinis brevibus compressis densissime seriatim ornatis ; 

 undique pulcherrimi rosed, intus albd. 

 Alt. 2 poli. ; lat. 1| poli. 

 Hab. Sooloo Seas and Korean Archipelago. 



I have much pleasure in dedicating this species, at the desire of 

 Capt. Sir Edvvard Belcher, to Sir Henry De la Beche, Director of 

 the Ordnance Survey and President of the Geological Society. It 

 forms a most interesting addition to the genus Cardiuin, and is \vith- 

 out exception the most striking and distinct from any hitherto known 

 that can well be imagined. In colour it is of a pure rose tint, with 

 the following singular contrast of character. The middle and ante- 

 rior portion of the shell is smooth, presenting a peculiar soft velvety 



