Zoological Society, 417 



Chiton acutieostratus. Chit, testd elongatd, medio elevatd, late- 

 raliter subcompressd, valvis summitate obtuso-carinatis, Icevibus, 

 utrinque creberrime planigranatis, umbonibus productis, acute ros- 

 tratis, valvarum areis lateralibus parvis, subindistinctis, concavis ; 

 albidd, summitate nigra hie illic inquinatd; ligamento cornea, 

 spicularum cristd parvd ad latus utriusque valva munita. 

 Long. 1| poll. ; lat. •§ poll. 

 Hab. Cape Rivers. 



An elongated species, of somewhat angularly compressed growth, 

 remarkably distinguished by the sharply beaked structure of the 

 urabones ; the flatly-grained sculpture of the valves approaches that 

 of C. hirudini/ormis, to which it offers a singular contrast of colour. 



Chiton petasus. Chit, testd parvd, subabbreviata-avatd, valvis 

 media ared trigand subrostratd politd, utrinque rugoso-granatis ; 

 vivid^ caccined ; ligamento latissimo, prcecipue antice, quoque vi- 

 vide coccineo, setis pilisve brevibus hie illic absito. 

 Long. 1 poll. ; lat. | poll. 

 Hab. Cape Rivers. 



A beautiful little bright scarlet shell enframed within a broad 

 swollen ligament of the same 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 oblongd, subangustd, valvis un^ 

 dique subtilissime longitudinaliter striatis ; vivide coccined ; liga- 

 mento cornea, spiculis vitreis nitide albis dense absito, spicularum 

 cristd densd erectd ad latus utriusque valvce. 

 Long. ^ poll. ; lat. -^ poll. 

 Hab. Cape Rivers. 



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

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

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



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

 IcBvigatd, striis minutis 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, quinque et viginti 

 ad triginta, spinis brevibus campressis densissime seriatim ornatis ; 

 undique pulcherrime rosed, intus alba. 

 Alt. 2 poll. ; lat. IJ poll. 

 Hab. Sooloo Seas and Korean Archipelago. 



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

 Capt. Sir Edward 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 Cardium, and is with- 

 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 



