180 CHITON. 



bluish, sinus with 5-13 denticles, deep, narrow ; girdle scales stout, 

 roundish. Length 39, breadth 23, divergence 94. 



One specimen, New Zealand, in Mus. Cuming. 



Species of the Mediterranean and African Seas. 



The species are allied to those of Australia and New Zealand, the 

 mucro in many of them being central, and the scales striated. 



C. OLIVACEUS Spengler. PI. 35, figs. 87, 88, 89, 90, 91, 92. 



Shell oblong, elevated, carinated, the side-slopes straight. Surface 

 ribbed and microscopically punctulate. Color very variable ; either 

 black, brown, scarlet or olive-green, unicolored or clouded or 

 mottled. 



Lateral areas raised, sculptured with 4-6 flat low radiating ribs, 

 the posterior rib widest, separated by narrow shallow grooves. 

 Central areas having a smooth triangle on the ridge of each valve, the 

 sides (pleura) bearing strong longitudinal ribs, which become 

 stronger toward the outer margin. End valves having low radiating 

 riblets. Tail valve having a conspicuous central apex, the posterior 

 slope somewhat concave. 



Interior light bluish, marked with brown rays in each valve. 

 Sutural plates rounded ; sinus deep, square, denticulate. Anterior 

 valve having 7-8 ; central valves 1, posterior valve 8-10 slits; 

 teeth blunt, pectinated. Eaves spongy. Girdle, wide, banded with 

 alternate light and dark, compactly covered with minute smooth, 

 convex scales. Length 36, breadth 20 mill., often less. 



Mediterranean and Adriatic Seas ; Cape Verde Is. 



Chiton squamosus POLI, Test. utr. Sicil. i, t. 3, f. 21, 22 (1791) 

 and of PAYRAUDEAU, COSTA, and PHIL., Enum. Moll. Sicil. i, p. 

 106, t. 7, f. 3 ; and of Granger, Moll. France, p. 170, t. 12, f. 16 

 (1885). Not of Linne. Chiton olivaceus SPENGLER, Skrivter af 

 Naturhistorie-Selskabet, iv, p. 75, t. 6, f. Sa-c (1797). Jeffreys, Kep. 

 Brit. Asso. Adv. Sci. 1873, p. 113. MONTEROSATO, Enum. e Sinon. 

 p. 17. BUQ. DAUTZ. et DOLLF., Moll. Mar. du Rouss. i. p. 489, t. 

 61, f. 4-6, t. 62, f. 4. LOCARD, Coq. Mar. des Cotes de Fr., p. 232 

 (1892). Ch. sukatus Risso, Hist. Eur. Merid iv, p. 268. TIBERI, 

 Bull, della Soc. Malac. Ital. iii, p. 145. Chiton siculus GRAY, 

 Spicil. Zool., p. 5; PHIL., Enum. Moll. Sicil. ii, p. 82. WEIN- 

 KAUFF, Conchyl. des Mittelrn. ii, p. 408. REEVE. Conch. Icon., t. 

 2, f. 5 ; t. 16, f. 97 (lowest fig.) ; t. 19, f. \1l.-Glymnoplax sicnlus 



