(ii i I..N. 157 



Lateral ATOM strongly raised, :iml wulpturtd //// 



low r'nli'itint/ rih.t Item-ing nf irrcgn/ur or regular inh-rrn/.-- 

 rnumh'd j. I tin ,-<iili'<iti><g /'/'Ax, tli.- i> ,r ///,,/ 



rior lionlrr of eacb valv gen< nil;. 



ticulated. OwUro/ oraoi tmoo^i hi the >/m/<//v, but tm^pfurtfd <i/< tn g 



/// tlingmi'il linen with <t ncrien <>( nlmrt rilm f'tit in /// .<//'//// o/' // 



reversed s Mud valves l)c;irinL r radiating series oft aber- 



cles, or with only a lr\\ scattered tiil)'i-clcs. Murro uc:ir the front 



margin. 



Interior light b/nc or light green. Sutural |ilat-s lii:litT, highly 

 arclu-d, tlie sinus deep, narrow, angular, the straight dentic- 

 ulate portion from ] to i the length of a sutural-platc. Anterior 

 valve having 13, central valves 1, posterior valve 12 slits. 



Girdle alternately whitish and brown or green, finely scaly. 



Length 36, breadth 22 mill. 



St. Thomas ami M. < ',<>!., (Swift) ; Jamaica. 



Chiton *(]n<nnosus denticularis, etc., ('HUM MI/, Conchy 1. Cab. x, 

 p. 372, t. 173, f. 1689. Chiton viridis SIM:N,LI:I:, s'krivu-r af 

 Naturhistorie-Selskabet. iv, p. 70, t. 6, f. 5 (1797). WOOD, 

 General Conch., p. 15 (1815). CAifam /oveo/atu* SOWERBY, Charles- 

 worth's Mag. of Nat. Hist. 1840, p. 290; Conch. Illustr., f. 60. 

 Ki:i:\ i:, (Jonch. Icon. t. 6, f. 28. Chiton costatus C. B. AD., Proc. 

 Bost. Soc. Nat. Hist. 1845, p. 8. Chiton (Lophyru*) gemmnlatus 

 SHUTTLEWORTH, Bern. Mittheil. 1853, p. 75. 



Doubtful references: Chiton squamosus, testa septen-valvi-striata, 

 etc., CHEMNITZ, /. c. x, p. 374, t. 173, f. 1690,= F<m'etef af Chiton 

 undatus, SPENGLER, Skrivter af Naturhistorie-Selskabet, iv, p. 69 

 (1797). Chiton tessellatus WOOD, Gen. Conch., p. 23 (1815). 

 Chiton excavatus (Gray) SOWB., Conch. 111., f. 131 (never de- 

 scribed.) 



This species is well distinguished by the series of short CM i 

 wrinkles along the diagonal latero-posterior edges of the other 

 smooth central areas, and by the sutural denticulation, when this is 

 developed, which is by no means always the case. The diagnostic 

 features of the species are stated with great clearness by the Danish 

 naturalist Spengler, and also by Chemnit/, but the figures given by 

 them are poor. There is great variation in the development of the 

 pustules upon the lateral areas and end valves. 



