ISCHNOCHITON. 137 



than the general tone of the shell, and conspicuously spotted with 

 the same red color. The grains of the mantle are smooth, arranged 

 in alternate greenish and reddish patches, and individually have a 

 dark spot generally on the outer side, which is only seen under a lens ; 

 those near the valves are considerably smaller than those situated 

 toward the edge of the girdle. Having parted the valves of one of 

 the specimens I find the front one has the margin of insertion 

 divided into seventeen unequal, squarely cut, slightly crinkled, sharp- 

 -edged teeth, of which the two outer on each side are the largest. 

 The sixteen slits between the teeth are very small and shallow. 

 The second, third, fourth, fifth, and sixth valves have on each side 

 a single very small narrow central notch, from which a groove or 

 depression runs to the apex of each valve ; the seventh is probably 

 abnormal, having a single notch on the right side and two on the 

 left, and the terminal valve has nineteen similar slits. 



I. milleri (Gray) Reeve. (PI. 24, figs. 18, 19). Shell ovate, 

 smooth ; central areas under the lens most minutely reticulated ; 

 lateral areas very finely striated. Olive or sometimes white, blotched 

 and dotted with black. Ligament coriaceous, tessellated with black 

 and yellow. (Rue.) 



" Eastern Seas." 



Chiton milleri ("Gray,") REEVE, Conch. Icon., t. 23, f. 156a; t. 

 24, f. 1566,c. 



This species was not described by Gray, although Reeve refers to 

 the Spicilegia Zoologia. It has been stated by d'Orbigny to be a 

 synonym of punctulatisswms. Carpenter seems to think it the same 

 as adelaidensis. The types should be re-examined in order to settle 

 the point. 



I. SMARAGDINUS Angas. PL 60, fig. 20. 



Shell oblong-elliptic, elevated, most minutely punctured, dull 

 bluish-green, delicately freckled with olive, the hinder edges of the 

 valves ornamented with very small white spots bordered with olive ; 

 the terminal valves and lateral areas faintly concentrically striated, 

 the central valves carinated, with the dorsal areas faintly trans- 

 versely striated, the lateral areas slightly elevated ; the mantle- 

 margin pale green marbled with black, and covered with small 

 smooth imbricated scales. Length 12 mill. (Angas.) 



Lilac, variegated with bluish, the side areas distinct, slightly 

 raised, more variegated and darker than the central areas. Jugum 



