DESCRIPTIONS OF NEW WPECIES AND VARIETIES OF CHITONIDJB 

 AND ACM^EID^E, FROM THE PANAMA COLLECTION OF THE 

 LATE PROF. C. B. ADAMS. BY PHILIP P. CARPENTER, B.A., 



PH.D. 



LEPIDOPLEURTJS ADAMSII. 



L. t. " L. dispari" simili; pallide rufo-fusca, colore intensiore 

 irregulariter strigata sen macula ta ; scepius maculis albidis 

 regione diagonali ornata ; jugo vix acuto ; areis centralibus 

 et valvis terminalibus conspicue granulosis ; areis lateralibus 

 irregulariter verrucosis, verrucis plerumque lobatis ; mucrone 

 antico, vix conspicuo : intus, valvis centralibus uni-, termina- 

 libus viii. x.-fissis ; subgrundis parvis, dentibus acutis ; sutu- 

 j'is medianis postice rectis, antice laminas haud attingentibus, 

 sinu planato, latissimo : limbo pallii imbricatim squamoso. 



Long. -6, lat. -3 poll. ; div. 1 10. 



Variat verrucis minus expressis, simplicioribus. 



Chiton dispar, C. B. Ad. no. 373, par. 



Lophyrus adamsii, P. Z. S., 1863, p. 24. 



Unfortunately for those who do not like to remove the non-tes- 

 taceous portion from their Chitons, as they do from their other shells, 

 the mantle-margin by no means affords a safe clue to the structure 

 of the valves. Among the species of the genus Ischnochiton, Gray, 



265 



