46 GASTEROPODA. 



* 214. N. cantharus, Reeve. Shell ovate, rather thin, convex, 

 apex very anterior, sharp, hooked, smooth. Black, irregularly blotched 

 with white ; interior blackish chestnut. (Reeve.') 



FAMILY ( 



Shell composed of eight transverse imbricating plates, lodged in a 

 coriaceous mantle, which forms an expanded margin round the body. 



CHITON. 



Mantle covered with scales ; exposed portion of the valves broader 

 than long. 



All parts of the world. 



215. C. COncentriCUS, Reeve, Condi. Icon., pi. 16,/ 95. Oval; 

 mantle with rather large scales ; valves compressed on each side, 

 keeled ; posterior margins pointed ; terminal and lateral areas closely 

 concentrically ribbed ; median areas distinctly longitudinally ribbed ; 

 dorsal line smooth. Mantle white or pinkish, irregularly banded with 

 yellowish brown ; terminal and lateral areas yellowish brown, median 

 areas white, with yellowish brown ribs. Length, 1 ; breadth, '5. 



This species is also found in Australia. 



216. C. canaliculatUS, Qnoy, Voy. Astrolabe, iii., p. 394. Ob- 

 long ; mantle with moderate sized scales ; valves compressed on each 

 side and keeled ; posterior margins straight, crenulated on their sides ; 

 terminal and lateral areas with radiating moniliform ridges ; median 

 areas with longitudinal ridges ; dorsal line smooth. Mantle pink, 

 with about twenty transverse yellowish pink bands ; terminal and 

 lateral areas deep pink ; median areas yellowish pink, sometimes longi- 

 tudinally varied with black. Length, 1 ; breadth, '5. 



217. C. pelliS-SerpentiS, Qttoy, Toy. Astrolabe, iii., p. 381. 

 Oval ; mantle with moderate sized scales ; valves elevated, rounded, 

 solid, opaque ; posterior margins curved, meeting in an obtuse point 

 on the back ; terminal areas with radiating moniliform lines ; lateral 

 areas of intermediate valves with curved radiating ribs, concave behind, 

 and crossed by curved longitudinal furrows, which are concave up- 

 wards ; median areas slightly longitudinally striated; dorsal line smooth 

 and polished on the anterior parts of the valves, but striated on the 

 posterior parts. Mantle yellowish or greenish white, with about 

 twenty transverse black bands ; valves generally greenish black, pass- 

 ing into yellowish on the back, and with a triangular black spot, with 

 its apex pointing backwards, along the dorsal line of all the inter-: 

 mediate valves. It is generally much eroded, but the size and colour 

 of the scales on the mantle are always sufficient to distinguish it from 

 other New Zealand species. Length, 1'5 ; breadth, '75. 



Abundant on rocks between high and low watermarks. 

 Pitt's Island. 



218. C. Sinclair!, Gray, Dief. N.Z., ii., p. 263. Oval; mantle 

 with moderate sized scales ; valves elevated and flattened on the sides ; 

 posterior margins straight, with a slight central point, and crenulated 



