REPORT ON THE POLYPLACOPHORA. 21 



figured by Reeve as C. squamosus, L., var. /3. (Conch. Ic, pi. iv. f. 23), ... It has not 

 been generally united with the C. squamosus of L. (S. N., ed. xii.), but is not improbably 

 a variety of it, and belongs to the same restricted group." 1 



There does not seem to be a sufficient distinction between this species and Chiton 

 assimilis, Reeve, to keep them apart. 



The earlier bibliography of this species will be found in Gmelin's edition of Linne 

 (1791, p. 3203), and in Deshayes' edition of Lamarck (loc. cit., pp. 490, 491). 



Cliiton murrayi, n. sp. (PI. I. fig. 7, PI. III. figs. 7a-7e). 

 Habitat. — Valparaiso. Shore. 



Shell. — Apparently smooth, but really very closely and finely striated, the striae being 

 roughened or interrupted ; greatly depressed. 



Anterior valve. — With radial striae ; under surface with eleven distinct square slits, 

 radial grooves distinct and perforated ; teeth of insertion plate serrate. 



Intermediate valves. — Narrow, flattened, non-carinate, with sharp depressed umbo, 

 surface striae longitudinal in central areas, radial in the lateral areas ; lateral areas distinct, 

 with slight concentric rugae, and with three or four scarcely apparent peripheral radial ridges, 

 which die away towards the apex ; sutural laminae shallow, a single lateral slit, lateral 

 insertion plates serrate ; jugum with nine rounded teeth, the central being very small. 



Posterior valve. — Flattened, slightly umbonate, striae longitudinal on the anterior 

 area, radial on the posterior area ; under surface with seventeen distinct slits, teeth 

 serrate ; jugum finely toothed. 



Colour. — Upper surface ground colour of shell a greenish grey, slightly clouded with 

 dark brown and black ; umbones lighter ; on each side of the latter the ground is yellowish ; 

 whole surface sprinkled with pale blue spots, which are bounded externally by a black 

 line ; on the central areas the spots run in irregular, obbque, backwardly diverging lines, 

 and have a slight tendency to confluence, but on the lateral areas and terminal valves the 

 spots are irregularly scattered ; under surface, pale sea-green, darker along the jugum, and 

 with a dark spot at the umbones of the terminal valves. 



Girdle. — Upper surface with large imbricate scales, of which the exposed portion is 

 smooth, the hidden portion being usually finely striated longitudinally ; colour, dark 

 green, with a tendency to form darker bands opposite the valves ; in the angles between 

 the valves a few of the scales are paler and yellowish in colour ; under surface with long 

 narrow oblong white scales arranged in transverse series. 



Gills. — Extending along the whole length of the foot, about fifty-five or sixty in 

 number. 



Size. — Length, 12 - 5 mm. ; breadth, 7*5 mm. 



1 Proc. U.S. Nat. Mm., p. 300. 



