l- UN'" III 



.</" 7 '"' x "- v - Hirll I' 

 nient.d longitudinally with n d -bni\\M, the margin with a 

 Centric green BOne. Kml valves ami lateral area* . ally 



ribbed, the ribs pii-tulo-e, interstice* minutely L r ranulated. Lateral 

 area- stiiiirwhat elevated. Median valve- eaiinated. I)or.-al .. 

 divaricately wrinklr-st riatr<!. (iinllc pah- lru\\n, eOTered with 



ly imbricating scales, I.rn-th :;.', Ix-ca.lth \in mill. (Ad.& 



I 



'l'hi> i> an excellent description of the exterior of this species. 

 [. COLUBBIFEB Kccvc. 1M. L ; 1 , tiirs. 51, 52. 



Shell ohlonu'-ovate, somewhat elevated in the middle. Terminal 

 valves and lateral areas peculiarly flat-drained, cent ral ana- 

 finely reticulated with circular and obliquestlifiB, Whiti.-li l)l>i. 

 with Itlaek ; li-ament scaly. (Reeve.~) 



Habit"! /////' 



C. colu In- it')- RKI:\ i:, Conch. Icon. t. 28, f. 188, Jan., 184N.--/.W,- 

 nockiton colubrtfer CPR., MS. 



Carpenter writes: Three specimens, Mus. Cuming. Very like a 

 yoiini: variety of the castu* group. Shell arched, not keeled, ele- 

 vated ; ashy, spotted with dark here and there, tinged with orange 

 about the umbos, which are not beaked. Central areas, and the 

 undifierentiated jugal areas, covered with a minute granulation, 

 runniiiLr perpendicular to the diagonal line and then brandling off 

 into wrinkles. Lateral areas and end valves having granulations 

 running into coarse concentric wrinkles. Posterior valve bavin- 

 10, central valves 1, anterior valve 9 slits; teeth extremely sharp 

 and tine; sinus broad, deep, smooth, deeply channelled at the bi 

 eaves long, solid. Girdle having typical Ischnoid scales, rather 

 large, flat, broad, thin, regularly imbricated, very finely striated. 



Length 16, breadth 7 mill.; divergence about 83. 



I. I-ALLIDULUS Reeve. PI. 23, figs. 96, 97. 



Shell elongated; terminal valves and lateral ar utrieully 



undulately wrinkled; central areas minutely rough; whitish 

 throughout; ligament horny, arenaceous, whitish. /,' 



Il'iltit'it n>ik> 



C. paWidti/iw EEEVB, Conch. IOOD. t. L'O, f. 131, May. ; 



IscJino'-hifon /Ktllidnliix Crii., .1/N. 



