98 POLYPLACOPHORA. 



LEPIDOPLEURUS BOTT.E Rocliebr. Shell elongated, carinated ; 

 olivaceous or whitish, painted with buff spots. Anterior valve, and 

 posterior part of the posterior valve, radially widely sulcated. 

 Lateral areas of the intermediate valves trisulcate ; central areas 

 longitudinally silicate, the sulci broad, incurved, very delicately 

 denticulate at the margin. Marginal ligament ashy, covered with 

 minute scales. Length 11, breadth 5 mill. (Rochebr. in Bull. Soc. 

 Philom. 1SS1-'S2, p. 192). 



Red Sea (Botta). Rare. Mus. Paris. 



This may possibly be Callistochiton heterodon, but the description 

 is too meager for identification. 



LEPIDOPLEURUS CONCHARUM Rochebr. Shell ovate, carinated, 

 waxen. Anterior valve, posterior area of the posterior valve and 

 lateral areas of intermediate valves radially minutely striolate. 

 Central areas sulcated, the sulci dentate. Marginal ligament small, 

 waxen, painted with green spots. Length 9, width 6 mill. (Rochebr. 

 in Bull. Soc. Philom. 1883-'84, p. 33). 



Red Sea. Rare. Mus. Paris. 



5. Philippine Island species. 



C. CALIGINOSUS Reeve. Vol. XIV, pi. 37, figs. 9, 10. 



Shell ovate ; terminal valves and lateral areas of the rest radiately 

 striated, striae here and there bifurcated ; central areas minutely 

 reticulated. Olive variegated with black; posterior margins of the 

 valves articulated with black. Ligament granosely coriaceous. The 

 articulated painting along the posterior edges of the valves is rather 

 a conspicuous feature in this species. (Eve.) 



Negros, Philippines. 



C. caliginosus RVE.. Conch. Icon., t. 25, f. 172 (May, 1847). 



Probably belongs either to Chiton s.s. or to the section Lepidozona 

 of Isclmochiton. 



CHITON BIRADIATUS Sowb. Shell oval, subelongated subdepressed, 

 obtusely angulated. Central areas minutely scabrous-sulcated ; 

 lateral areas subelevated, with two bifid, very irregularly moniliform 

 ribs on each side; terminal areas radially rugose-cost ate ; margin 

 most minutely granulose. Color pale tawny, maculated with gray. 

 Margin gray banded. Length *60, width '35 inch. (Sowb. in P. Z. 

 S. 1843, p. 102). 



Dumaguete, Island of Negros, Philippines (Cuming). 



