110 POLYPLACOI'HOKA. 



with hrown spots. Length four-tenths of an inch, breadth one 

 quarter. A solitary specimen of this elegant little shell was found 

 at Valparaiso. I have, however, some doubts of its being adult. 

 (Fremb.) 



Valparaiso (Fremb.) 



Chiton glaucocinctus FREMB., Zool. Journ. iii, p. 201, Suppl., pi. 

 17, f. 2 (1827). 



Probably belongs to Chiton s. str., but its generic position is not 

 known. No other author has mentioned the species. 



C. GRANULOSUS Frembly. Vol. XIV, pi. 24, fig. 5. 



Shell narrow, granulated, granulations very fine; brown marbled, 

 back acute, elevated ; dorsal valves a little convex, not divided into 

 compartments. Border narrow, covered with rather coarse granules 

 of the same color as the shell. 



Length 10, breadth 5 mill. 



Conception Bay, Chili, on Calyptnea. 



Chiton granulosus FREMBLY, Zool. Journal iii, p. 201, t. (suppl.) 

 17, f. 3(1827). 



Frembly's description is given above, and his figure copied on 

 the plate. It is doubtful to what genus it should be referred, as the 

 internal characters are not known. 



O. CINGILLATUS Reeve. Vol. XIV, pi. 38, figs. 29, 30. 



Shell ovate; valves smooth, surrounded near the margin with two 

 or three concentric ridges ; olive ; ligament granosely coriaceous. 

 The ridges at the end of the lateral areas form rows of concentric 

 circles round the shell, which are very characteristic. (Rve.) 



South America. 



C. cingillatus RVE., Conch. Icon., t. 23, f. 160 (May, 1847). 

 Mopaliopsis cingillata Tin ELK, Das Gel>i>s, p. 393, 394. 



The generic position of this species is doubtful. It may be either 

 a Lepidozona or a C/titon. The locality given by Reeve is rather 

 vague. Dr. Thiele has erected a new genus, Mojmliojtti*, for this 

 form, hut as he characterizes it by the dentition alone, no light is 

 cast upon the true 'systematic position of the species. 



( . i IMI.KIATUS Sowerby. PI. 10, figs. 18, 19. 



Shell oval, depressed, broad ; central areas very finely granose- 

 lineate; lateral areas and end valves very finely cancellated ; girdle 

 very finely granulate. Length 17* breadth 12$ mill. (Sowb.) 



