MOPALIA. 



109 



richly sculptured. The raised triangles on the valves 

 are adorned with rows of rounded knobs, and the 

 interspaces with ribs and frets. They are very beau- 

 tiful when examined with a lens. The mantle-border 

 is covered with fine, rounded scales. Length, one 

 inch; northern. 



The large Chiton shown in Fig. 97 is named 

 Mopalia lignosa^ Mo-pa'-li-a lig-no'-sa. It differs 

 from the last species in many respects. It grows 



to a much larger size, and 

 its smooth valves are quite 

 sharply arched. These 

 valves are of a light green 

 color within, but on the 

 outside they vary from al- 

 most white to dark green. 

 They are also marked w4th 

 narrow brown lines, which 

 slant from the apex of each 

 valve. The mantle-border 

 is generally quite rough, 

 especially in large speci- 

 mens, but sometimes we 

 find it nearly smooth. The 

 cut represents a large-sized 

 specimen; ordinary ones are 

 less than two inches in 

 C5^ Fig. 97. length. 



Mopalia Wosnessenskii^ Midd., Wos-ness-en'-ski-i, 

 is the ponderous name of another species. Though 

 the Chinese are called Celestials, the ending " ski " 

 refers us at once to the Russians, and we shall find 

 names of this origin occasionally coming to light in 

 the list of our shells. 



