CHITON.—Puate IV. 
THe Coavimpo Cuiton. Shell somewhat eclongately 
ovate, anterior terminal valve smooth, posterior keeled 
on both sides, lateral areas of the rest granosely 
keeled, central areas rayed with two rather broad 
punctured grooves with numerous close-set arched 
narrow grooves near the keels of the sides; dark 
chocolate-brown; ligament horny, subarenaceous, 
blackish, furnished with light brown longitudinally 
oblong processes throughout. 
FREMBLY, Zool. Journal, vol. iti. p. 197. 
Hab. South side of Coquimbo Bay, Chil (in exposed 
situations on rocks); Frembly, Cuming. 
The ligament of this shell is quite peculiar, I am not 
aware that there is the least approximation in respect to 
its curious oblong processes in any other species. Living in 
exposed situations the valves are for the most part more 
or less eroded at the umbones. 
For description of Fig. 23, see Pl. 3. Sp. 16. Chaton 
squamosus, Var. B. 
