ASTARTID. 159 
_ The young shell is slightly marked with reddish-brown, and all the 
ribs are sometimes sub-spinose. The Natives call this shell “ purimu.” 
C. zealandica, Poti: and Michaud, Gall. des Moll., 1838, p. 166. 
Shell sub-orbicular, inequilateral, swollen, greyish-white, internally spotted 
with blackish-purple, polished ; cancellated with numerous longitudinal 
strize and transverse sub-lamelle ; umbones oblique, recurved, hinge 
two-toothed ; margin finely plicated (P. & M.). 
C. lutea, “Hutton; C. zealandica, Deshayes, P.Z.S., 1852, p. 101, 
not of P. & M. Shell small, orbiculato-subtrigonal, depressed, longitu- 
dinally 14-ribbed, sub-equilateral, pale brownish ; ribs regular, for a time 
sub-squamose, equal to the interstices ; umbones small, acute, sub-op- 
posite ; lunule not very deep, brown, lanceolate (Deshayes). 
Auckland. 
GC. bimaculata, Deshayes, P.Z.S., 1852, p. 102, pl. xvii., fi 4-5. 
Shell ovato-subtrigonal, inequilateral, depressed, both sides obtuse, 
under the rough brown epidermis greyish-white, radiately ribbed ; ribs 
17-19, narrow, equal, not larger than the interstices, with regular erect 
sharp scales, narrower behind ; apices acute; lunule deep, ovato lanceo- 
late; interior of the valves white with a brown spot on either side 
(Deshayes). 
New Zealand. (Cuming). 
CG. amabilis, Deshaves, P.Z.S., 1852, p. 102, pl. xvii., f 8-9. Shell 
sub-orbicular, laterally compressed, sub-equilateral, radiately finely rib- 
bed, yellowish-white, irregularly spotted with pale brown ; umbones small 
opposite ; lunule flat, scarcely excavated, smooth, ovate; ribs 28, regularly 
crenato-noduled ; hinge thicked, in the right valve unidentate, in the 
left bidentate, teeth of right valve triangular large ; interior of valves 
white (Deshayes). 
New Zealand. (Cuming.) Tasmania. (Tenison-Woods.) 
C. difficilis, Deshayes, P.Z.S., 1852, p. 103, pl. xvil. f- 16,17. Shell 
ovato-transverse, inequilateral, swollen, solid, convex at the margins, 
white, epidermis rough brownish, unspotted ; radiately nbbed ; umbones 
oblique, opposite ; lunule very small, deep, smooth, flat; ribs sub-angled, 
crenato-scaly, sharp, especially at the umbones and the posterior side ; 
interstices sub-equal to the ribs; interior of valves very white ; hinge 
narrow (Deshayes). 
New Zealand. (Cuming). 
C. purpurata, Deshayes, P.Z.S., 1852, p. 100, pl. xvil., f- 12, 13. 
Shell ovato-transverse, sub-trigonal, inequilateral, anterior shorter, 
obtuse, depressed, radiately sulcated, yellowish-white, reddish behind ; 
umbones oblique, prominent; lunule small, deep, flat, smooth ; trans- 
verse ribs shortly scaled, 26, narrower behind, roughish, one more pro- 
minent than the others ; interior of valves pale purple, at the margin 
vividly radiated with purple (Deshayes). 
New Zealand. (Cuming). 
