200 Bulletin, Vanderoilt Marine Museum, Vol. IV 



The sutural plates are well developed, the sinus flat, wide. Teeth 

 sharp, smooth, Eaves solid, grayish. 



The girdle consists of very minute, flat, solid, non-striated scales. 



This species is readily recognized in the field by the sculpture of the 

 lateral areas and end valves, which are not granulated but have 

 slightly serrated concentric flat riblets. The girdle scales are very 

 minute, flat, solid, not striated. 



References : Chiton limaciformis Broderip and Sowerby, Proc. Zool. 



Soc, London, 1832, p. 26. — Sowerby, Conch Illus., fig. 38. — 



Reeve, Conch. Icon., tab. 8, fig. 42. 

 Ischnochiton limaciformis Shuttleworth, Bern. Mittheil, p. 190, 1853. 

 Ischnochiton (Stenoplax) limaciformis Carpenter, Mss. — Dall, Bull. 



Mus. Comp. Zool., vol. 18, pt. 2, p. 415, 1889.— Tryon, Man. 



Conch., vol. 14, p. 57, 1892.— Dall, Proc. U. S.-Nat. Mus., vol. 37, 



p. 245, 1910. 

 Ischnochiton multicostatus Dall (not C. B. Adams), Proc. U. S. Nat. 



Mus., vol. 6, p. 337, 1883. 

 Chiton productus Reeve, Conch. Icon., t. 17, fig. 97, 1847. 

 Chiton sanguineus Reeve, I. c, fig. 98. 



Superf amily : Teleoplacophora. 



Family: CHITONIDAE. 



Subfamily: Chitoninae. 



Genus : CHITON Linne, s.s. 



Subgenus : Chiton 

 Chiton (Chiton) latus Sowerby. 



Plate 125, fig. B. 



Type: The type locality was not known to Sowerby. It was first 

 known in the private collection of the Earl of Tankerville, which was 

 sold in 1825 ; present depository not traced. 



Distribution : Chile ; Valparaiso and Coquimbo ; Galapagos Islands. 

 A reef-dwelling species. 



Material examined : One large specimen, collected at Gardner Bay, 

 Hood Island, Galapagos Islands, by the "Ara," February 4, 1928. 



Color: Shell black with small blue flecks distributed abundantly 

 over the valves. Interior light blue. Girdle black. 



Shell: Strong, large, oval, moderately elevated, jugum finely cari- 

 nated, pleura slightly convex. 



