POLYPLACOPHORA. 109 



roded. Central areas covered with minute rod-like (" virgiiliform") 

 striae. Marginal ligament rather wide, white, ornamented with 

 alternate ashen and orange spots. Length 15, breadth 8 mill. 

 (Rochebr., in Bull. Soc. Philom. 1883-'84, p. 36). 



Island Cochino, Guadeloupe. Rare. Mus. Paris. 



GYMNOPLAX SPICIFERUS Rochebr. Shell elongated, carinated; 

 rose red striated with green lines. Posterior valve obtusely umbo- 

 nated. Anterior valve, posterior part of the posterior valve, and 

 lateral areas of the intermediate valves clothed with radiating headed 

 ribs. Central areas sculptured with branching sharp radial sulci. 

 Marginal ligament narrow, white, ornamented with elongated green 

 spots. Length 29, breadth 12 mill. (Rochebr., in Bull. Soc. Philom. 

 Paris, 1883-'84, p. 36). 



Island Cochino, Guadeloupe. Rare. Mus. Paris. 



OXITOCHITON [sic] PRUINOSUM Rochebr. Shell elongated, 

 rotund ; whitish ornamented with green dots and red spots. Ante- 

 rior valve, posterior area of the posterior valve, and lateral areas 

 of the intermediate valves regularly and concentrically sulcate; 

 central areas sculptured with most minute, interrupted, subdichoto- 

 mous striaB. Marginal ligament narrow, frosted. Length 27, 

 breadth 10 mill. (Rochebr., Bull. Soc. Philom. Paris, 1883-'84, p. 

 35). 



Island Cochino, Guadeloupe. Quite common. Mus. Paris. 



ONITHOCHITOX MARGARITIFERUM Rochebr. Shell elliptical; 

 pale rufous, painted with red spots. Anterior valve, posterior part 

 of the posterior valve and lateral areas of the intermediate valves 

 ribbed, the ribs tuberculate. Central areas minutely striated, stria? 

 clothed with acute denticles. Marginal ligament very narrow, 

 rufous. Length 10, breadth 5 mill. (Rochebr. in Bull. Soc. Philom. 

 1883-'84, p. 35). 



Island Cochino, Guadeloupe. Rare. Mus. Paris. 



10. South American Species. 



CHITON GLAUCOCINCTUS Frembly. PI. 10, fig. 12. 



Shell oblong ovate, reddish, marked with alternate brown and 

 greenish blue stripes. Valves eight, the first and last radiated; 

 dorsal valves smooth, divided into two parts by a transverse ridge ; 

 posterior compartment grooved. Border broad, granulate, pink, 



