LEPIDOPLEURUS. 471 



Ex. C. fuliginatns, Adams and Reeve, pi. 53, fig. -2, 

 2, a. C. laevis, Pennant, fig. 2, 6. 



In this genus, which is remarkable for the smooth, 

 reticulate aspect of the mantle-margin, the plate of in- 

 sertion of the terminal valve is many-lobed, and that of 

 the middle-valves four-lobed. 



Species of Callochiton. 



castaneus, Wood. interstinctus, Gould. 



cerasinus, Chem. laevis, Penn. 



fuliginatus, Adams and pulchellus, Graij. 



Reeve. punctulatissimus, Sow. 



fulgetrum, E^eve. ■ puniceus, Couth. 



Genus LEPIDOPLEURUS, Risso. 



Mantle covered with minute, flattened, longitudinally- 

 grooved scales. 



Shell with the valves external, broad ; the hinder valve 

 with the apex sub-central. 



Si/n. Ischnochiton, Grai/. Ischnoradsia, Shuttleiv. 



Ex. L. limaciformis, »S'o^£7er%, pi. 53, fig, 3. L. Caje- 

 tanus, Poll, fig. 3, a. L. pectinatus, Sotverhy, fig. 3, h. 



The plates of insertion of the valves in this group are 

 thin and smooth-edged ; those of the central valves have a 

 single notch in some species, but in others they are four- 

 to five-lobed ; the laminae of insertion of the terminal 

 valves are many-lobed. The species are numerous, and 

 have a world-wide distribution. 



Species of Lepidopleurus. 



alatus, Sow. Cajetanus, Pali. 



antiquus, Heeve. caliginosus, Reeve. 



