68 CALLOCHITON. 



Chiton sanguineus DESH., Catalogue des Mollusques de File de 

 Reunion, p. 40, t. 6, f. 4-7. Chiton (Lepidopleurus) sanguineus 

 MARTENS in Mobius' Reise nach Mauritius, p. 300. Callochiton 

 sanguineus THIELE, Das Gebiss d. Schn. ii, p. 392, t. 32, f. 9 (denti- 

 tion.) 



Figure 27 is much enlarged. Deshayes compares this species to a 

 dried drop of blood. 



Subgenus TRACHYRADSIA Cpr., 1878. 



Trachyradsia CPR. in Dall, (part) 1878, type Ch. fulgetrum Rve. 

 vide Manual, xiv, p. 83. Stereochiton CPR. in Dall, 1882, type Ch. 

 castaneus Wood ; vide Manual xiv, p. 52. 



Valves almost smooth, but minutely granulated or punctulate 

 having several slits in each side insertion-plate, very spongy eaves, 

 and shallow sinus, across which the sutural laminae are connected 

 (see vol. xiv, pi. 9, fig. 90). Girdle bearing minute downy scales. 

 Distribution S. Africa and Tasmania. 



This group, as here reformed, claims kinship with Callochiton ; 

 and so close is the alliance that it has been by Carpenter and myself 

 ranked as a subgenus or section under that genus. The North 

 Pacific forms formerly referred here have been given place under the 

 genus Traehydermon, in the section Spongioradsia. 



C. DENTATUS Spengler. ( C. fulgetrum Reeve. Vol. xiv, p. 83). 



The Chiton planatus Spengler (Skrivter af Naturhist.-Selsk. iv, p. 

 91), is probably the same as C. dentatus of the same author (I. c., 

 p. 88), and both seem to agree with C. fulgetrum Reeve. Both are 

 said by Spengler to be from the Cape of Good Hope. See also Mai. 

 Bl. xvii,p. 113. 



C. CASTANEUS Wood. (Vol. xiv, p. 52.) 



Spengler's Chiton bicolor (I. c., p. 90, p. 6, f. 18) is this species, and 

 the name has priority, but cannot fairly be adopted on account of 

 the previous use of the name bicolor by Gmelin, for a smooth species 

 apparently different and distinct. 



C. INORNATUS Tenison- Woods. PI. 13, figs. 63, 64. 



" Shell oval, thin, depressed, of a uniform deep brown, very finely 

 dotted all over with minute depressions like the top of a thimble ; 

 valves of a uniform width, keeled, slightly beaked ; lateral areas very 

 little elevated, with obsolete radiate striations ; central areas finely 



