GASTEROPODA. 47 



on the sides ; terminal areas with radiating nioniliformf ribs ; lateral 

 areas with flat, sub-inoniliform, radiating ribs, crossed by a few irregular 

 transverse furrows ; median areas finely longitudinally striated on the 

 sides, but smooth and polished on the back. Mantle brown, trans- 

 versely banded with black ; valves pale brown, longitudinally varied 

 with paler brown and black. The scales on the mantle are smaller 

 and natter than those of C. pellis-serpentis. Length, T35 ; breadth, '7. 



219. C. qUOyi, Deshayes, Anim. sans vert., vii., p. 509 ; C. viridis, 

 Quoy (nee Chemnitz), Voy. Astrolabe, iii., p. 383. Oval; mantle with 

 moderate sized scales ; valves elevated, flattened on each side ; posterior 

 margins slightly concave, with a small central point ; the anterior 

 valve, the greater part of the posterior valve, and the lateral areas of 

 the intermediate valves with fine radiating strife ; median areas very 

 finely longitudinally striated. Generally dark olive green, or blackish 

 green when dry, but sometimes brown, or green rayed with brown, and 

 the mantle is sometimes varied with white. Length, 1*5 ; breadth, '75. 



Common under stones in pools left by the retreating tide. Found 

 also in Australia. 



Perhaps a variety of C. cliilolensis. 



220. C. SUlcatUS, Quo//, Voy. Astrolabe, iii., p. 385. Oval ; 

 mantle with small scales ; valves depressed, slighly flattened on each 

 side ; posterior margins straight, crenulated on the sides ; terminal 

 and lateral areas finely granulate ; median areas with fine distant 

 longitudinal ribs. Mantle reddish brown ; valves whitish brown, dull. 

 Length, "4 ; breadth, '25. 



Specimens from Kapiti are in the Colonial Museum ; it is also 

 found in Australia. I do not feel quite sure as to the identification of 

 this species, for I have no Australian specimens for comparison, and 

 the description in LamarJc is not very definite, but I think that the 

 difference between the two, if any, must be very slight. 



221. C. longicymbllS, De Blainville ; Sowerly, Condi. Ilhis., 

 f. 67. Oblong ; mantle with very minute scales ; valves rounded ; 



posterior margins straight, or slightly concave ; terminal areas with 

 fine radiating moniliform lines ; lateral areas with radiating ribs crossed 

 by rather deep, curved, transverse furrows ; median areas of both 

 terminal and intermediate valves finely punctate. Brown, variously 

 tinted with green, yellow, or whitish, sometimes pink on the back 

 when rubbed ; often entirely greenish brown, minutely freckled with 

 yellow ; often brown, with a broad white stripe down the back. 

 Length, l - 4 ; breadth, '65. 



Very variable both in shape and colour. 



Common under stones. Pitt's Island. Found also in Australia. 



* 222. C. circumvallatUS, Reeve. Shell oblong-ovate, terminal 

 valves and lateral areas of the rest sculptured with concentric ridges ; 

 central areas very minutely reticulated ; posterior terminal valve 

 urnbonated. Blackish red, spotted with black, ligament arenaceous, 

 tesselated. (Reeve.) 



Distinguished from G. longicymbus by the conspicuous ridge with 

 which it is encircled. 



