296 Bulletin Vanderbilt Marine Museum, Vol. VII 



with the surface concentrically wrinkled and studded with nu- 

 merous eyes. There are nine slits present. 



Intermediate valves: These valves are definitely beaked in 

 the jugal area, considerably eroded and with the lateral areas but 

 little raised, concentrically toward their bases and studded with 

 minute scattered eyes, appearing as blackish dots. The central 

 areas are wrinkled and have scattered eyes at the sides. Each 

 valve has one slit. 



Posterior valve: This is small, depressed, with a contour simi- 

 lar to that of the intermediate valves. The mucro is terminal but 

 much eroded. Internally the posterior valve has the eaves pro- 

 jecting beyond the broad, flat, crescentic callus which occupies 

 the place of an insertion plate. 



Girdle: This is very wide in ratio to the shell, being as wide 

 at the anterior end, or slightly wider than the length of the first 

 valve and this belt width increases to the median lateral area, 

 where this width is slightly over one-half of the width of the widest 

 valve. The girdle is densely clothed with intermingled minute 

 and very large calcareous spines, which are short, cylindrical, 

 tapered a little and distally rounded. A few are bowed, but the 

 majority are straight, conical. Some are blackish, some white and 

 a few are streaked. 



References: Chiton gaimardi, de Blainville, H. M. D., Diet. 



Sci. Nat. Paris, 1825, t. XXXVI, p. 546. 

 Chiton incanus, Gould, A. A., Proc. Boston Soc. Nat. Hist., 1846, 



vol. II, p. 245; in Wilkes, U. S. Explor. Exped. Mollusks, 



vol. XII, 1852, p. 315; atlas XII, pi. 28, figs. 432-a; Otia 



Conch., 1846, p. 6. 

 Maugeria incanus, Gould, A. A., op. cit., p. 248. 

 Acanthopleura incana, Smith, E. A., Zool. Coll. H. M. S. "Alert," 



publ. B. M. N. H., 1884, p. 81. 

 fChiton piceus, Angas, G. P., Proc. Zool. Soc. London, 1867, p. 223. 

 Acanthopleura (?) incana, Haddon, A., Rept. Voy. H. M. S. 



"Challenger" Zool., 1886, vol. XV, Polyplacophora, p. 223. 



(Partim) . 

 Liolophura gaimardi, Pilsbry, H. A., in Tryon; G. W., Man. 



Conch., 1892, vol. XIV, Polyplacophora, p. 240, pi. 53, figs. 3- 



35.— NiERSTRASZ, H. F., Siboga-Expeditie, Monog. XL VIII, 



1905, p. 108. 



