180 



SYSTEMATIC ARRANGEMENT 



A. Mantles without any pores, furnished with fascicles of bristles 

 or spines on the sides. 



Fig. 96. — Valves of Chiton olivaceus. 



a. The exposed part of the valves broad, band-like, transverse, 

 closely imbricate one on the other. The plates of insertion 

 moderate, of the anterior and the posterior valve divided into 

 several lobes more or less pectinated on the edge. 



* Margin covered with uniform scales, entire behind. 



1. Chiton. 

 Margin covered with regularly disposed, imbricate, smooth, polished 

 scales ; valves thick ; the plates 

 of insertion pectinately lobed, of 

 the central valve with a single sub- 

 central notch, of the hinder valve 

 broad, distinctly lobed and pecti- 

 nated ; the hinder valve entire ; 

 apex superior, subcentral (fig. 96). 

 The gill occupying nearly the whole 

 length of the sides of the foot. 



f Scales of the margin moderate- 

 sized. 



1 . Ch. striatus, Sow. III. f. 3, 4 1 . 



Chiloe. 



2. Ch. Cumingii, Sow. III. f. 32, 



51. Chili. 



3. Ch. albolineatus, Sow. III. 



f. 39. Mexico. 



4. Ch. squamosus. West Indies. 



5. Ch. sulcatus, Sow. III. f. 12. 

 fi. Ch. granosus. Chili. 



7. Ch. glaucus. 



8. Ch. granulosus. Conception. 



9. Ch. Siculus. 



10. Ch. liratus, Sow. III. f. 126. 



11. Ch. foveolatus, Sow. III. f. 60. 



12. Ch. excavatus, Sow. III. f. 1 3 1 . 



13. Ch. fasciatus, Sow. III. f. 153. 



14. Ch. australis, Sow. III. f. 46. 



15. Ch. Stokesii, Sow. III. f. 24. 



16. Ch.virgulatus,£ow. J//.f. 132. 



17. Ch. patulus, Sow. III. f. 134. 



18. Ch. marmoratus, Sow. III. 



f. 148. 



1 9 . Ch . articulatus, Sow . III. f . 1 8 . 



20. Ch. laevigata, Sow. III. f. 1 8*. 



21. Ch. Goodallii, Sow. III. f. 50. 





A, anterior, H, middle, and C, terminal 

 valves. D, E, P, inner surface of 

 same valves, g, the small lobes in 

 the middle of the anterior margin 

 between the wings, h, i,&k, notches 

 in margin of insertion. I &m, con- 

 fines of central area. 



