206 TONICIA. 



with bright reddish-brown. Valves strongly beaked, the umbo of the 

 tail-valve far to the posterior (fig. 54). Central areas smooth 

 throughout ; lateral areas separated from the central by a prom- 

 inent, rounded, curved diagonal rib, and smooth except for a broad 

 band of black eye dots, variously arranged, on the forward half; 

 sutures feebly or obsoletely crenulated. Head-valve smooth except 

 for 8-10 broad rays of eye-spots. 



Interior white, stained with crimson along the jugal tract. Sinus 

 obsoletely denticulate. Anterior valve having 9-10, central valves 

 1, posterior valve 14 slits; teeth deeply and regularly pectinated on 

 outer face and edge. Posterior border of each valve inflexed and 

 maculated with reddish. 



Girdle leathery, tawny, flesh-colored. 



Guadalupe ; Florida Keys ; Bermuda, 



Chiton (Tonicia) schrammi SHUTTLW., Journ. de Conchyl. 1856, 

 p. 171, t. 6, f. 9. T. schrammi HEILPRIN, The Bermuda Is., p. 176. 

 BALL, Catal. Moll. S. E. U. S., p. 174. 



This form differs markedly from those of Western South Amer- 

 ica in the non-sculptured central areas, prominent diagonal rib (like 

 that of T. crenulatd), and broad bands of eye-spots. The umbo of 

 the tail-valve is far backward, and in most specimens the posterior 

 margin of the same valve is distinctly emarginate in the middle, the 

 teeth being much shorter there and irregular. In this it resembles 

 Eudoxochiton. The diagonal rib is more prominent, and the eyes 

 far more numerous than in T. rubridens. The nearest ally of 

 schrammi is the very differently sculptured T. crenulatus. 



3. Species of Australia, New Zealand, Philippines, etc., etc. 



T. SUEZENSIS Reeve. PI. 40, figs. 16, 17. 



Shell oblong ovate, valves very closely concentrically wrinkled 

 at the sides, with oblique wrinkles toward the middle ; yellowish, 

 delicately stained with pale scarlet and green ; ligament horny. 



(Reeve.} 



Gulf of Suez. 



C. suezensis REEVE, Couch. Icon., t. 20, f. 134 (May, 1847). 

 ISSEL, Moll. Mar Rosso, p. 235. COOKE, Ann. Mag. N. H. 1885, p. 

 276. ? SAVIGNY, Descr. Aegypte, t. 3, f. 4. Tonicia ? suezensis 

 CPU., MS! 



Carpenter writes: Mucro subposterior-median, rectangularly 

 elevated. Interior : anterior valve having 8, central 1, posterior 

 valve 13 slits; posterior teeth shorter, bending forward, anterior 



