i!\- 111 ! 



in tin- >inu> is perhaps accidental, from their being older specn 



"0 



'.<aahw Reeve. (PI. 23, li.irs. 83, 84.) Shell oblong-ovate, 



a little attenuated posteriorly. Terminal valves and lateral areas 

 ned, the grains rather obtuse, numerous, irregular, intei - 



ated with very close slightly wrinkled 

 Pale \vllowi>h-<:recn, flamed along tlie suiuinit with brown. 



Rpe.) 



Australia Mus. Cuming, 1 specimen). 



< . r,,.<tn8 Reeve. (PI. 23, figs. 87, 88.) Shell oval, subelongate, 

 rather elevated, orange tinted with red : juirum acute: mucro rather 

 raised, median, the slope behind it concave. Central areas cloM-ly 

 wrinkled, the wrinkles at the ju-rum divenriiiLr laterally, sometimes 

 interrupting one another and forming zigzags. Lateral areas and 

 end valves with concentric nodular wrinkles, sometimes the wrinkles, 

 -ometimes the nodules predominating; nodose at the sutures. 



Interior orange-flesh tinged ; front valve with 9, central 1, poste- 

 rior 1') slits ; teeth acute, scarcely pectinated ; sinus wide, flat, deep, 

 >liirhtly and very minutely denticulated by the external sculpture; 

 laigc, hardly spongy. 



Girdle olivaceous, slightly tessellated, imbricated with large, 

 wide and solid, deeply striated scales. Length 21, breadth 12 mill. : 

 irence 103. (Cpr.,from type specimen.) 



A n^rnlin. 



The ireneral characters of this species are the same as in Irstili* 

 and rat'iosus, but it differs sufficiently in sculpture. Both of the 

 two specimens in the Brit. Mus. are curved up so that thev cannot 

 be measured accurately. 



Another form which Carpenter described in J/N. as " 1. cimtn* n. 

 >p.," but which he afterward decided to be synonymous with wnthut 

 . i> white with a black rirdle. The shell is much elevated with 

 acute juirum ; the central areas have delicate but much raised lira, 

 about ')<> on each >ide, and subparallel except toward the ridge 

 where they bend outward, and upon the juirum they are elegant! v 

 undulating. The lateral areas and end valves have rather large, 

 separ: rly radiating, serrating the sutures. The 



anteri<.r valve has 13, central 1, posterior valve 11 slit>. The 

 irirdle U clothed with narrow, stout, deeply grooved scales. Len^tli 

 ::n. breadth \\\ mill.; divergence 110. It is from Su>, t /,' 

 MII-. ( 'umini:. No. 100). 



