CHONEPLAX. 61 



This may prove to be the young of C. latus, the pointed shape of 

 the valves being due to their non-eroded condition ; but the slits 

 seem to be more strongly developed. Figs. 16, 17, 18, 19 are from 

 Sowerby's illustrations; figs. 22 are from sketches made by Car- 

 penter from the type. 



Carpenter writes of the type specimen : I cannot see the very 

 long hairs figured by Sowerby, but here and there are a few very 

 fine dark hairs, looking like pores, and occasionally but not always 

 sutural ; round the margin there are a great many extremely minute, 

 rather distinct hairs. Jugular areas long and narrow, in some valves 

 sculptured and colored like the rest, only finer and with long 

 lyrulse ; in others they are worn and dark colored ; in two last 

 valves dark bordered with white, with fine granules over it. Central 

 and side areas not divided, having about 10-12 rows of granules 

 branching out. Inside : anterior valve having 4 slight slits at the 

 end of very long teeth ; central valves with one little slit, near the 

 sculptured part ; posterior valve with one very decided slit on each 

 side. 



