328 MOLLUSCA. 
of a pale cream-colour, delicately variegated with rose and flesh-colour, 
often producing checks along the edge of the valves and reticulations 
at the margin; valves strongly beaked, the lateral areas raised and 
bounded by an obtuse, elevated line, which is laminated in triangles 
pointing towards the apex, and another line of similar lamin sculp- 
tures the posterior margin; the intervening space is smooth, but with 
a few, scattered, impressed rings, each including a granule; central 
areas in general smooth, but pierced with minute though distinct trian- 
gular punctures pointing backwards; posterior valve with a remarka- 
bly gibbous beak, by which at least a right angle is formed, crossed by 
a transverse band, before which the valve is punctured, and behind it 
slightly scaly and minutely dotted in quincunx ; anterior valve some- 
what radiately squamose and granulated; teeth of insertion nine, and of 
the posterior valve twenty-five, all delicately pectinated. Margin dark, 
not granulated. 
Length five-eighths of an inch; breadth three-eighths of an inch. 
Inhabits the Feejee Islands. 
Allied to C. sculptus, Sowb., which has three lateral rays and the 
central areas smooth. But it is altogether dissimilar from other de- 
scribed species. 
Figure 434, superior view of the shell; 434 a, details of sculpture, 
enlarged ; 434 0, profile of the extreme valves, with their denticles. 
Cuiron PETALOIDES (Gould). 
Testa parva, tenuis, ovalis, arcuatim elevata, subcarinata, diluté citrina ; 
areis lateralibus elevatis, rugose granulatis, et stris radiantibus ad 
quatuor insculptis ; areis centralibus longitudinalter rugosé granu- 
lato-punctatis, et lineolis tenuissimis angulatis dilute violacets pictis ; 
valvd postertort acute umbonata et costa transversal divisa: margo 
stramineus, minutissime granulato-imbricatus. 
Chiton petaloides, Goutp; Proceed. Boston Soc. Nat. Hist., i. 144. 
July 1846. Expedition Shells, 6. 
SHELL small, delicate, elliptical, roundly arched, very slightly cari- 
