80 Couthouy's New Species of Mollusca 
exception of what appeared to border upon a constant 
variety—a broad white irregular spot on the back between 
each pair of branchie, which, in a few instances, ex- 
tended the whole of its length. The proportion of in- 
dividuals thus marked was nearly as one to four. The 
only difference noted in the others was that of a deeper 
or lighter shade of brown. 
CHITON FULMINATUS. 
C. testa oblongo-ovali, anticé sub-attenuatà, plerumque rufo-flaves- 
cente aut virescente, lineis albis angulatis et flammulatis pictà ; valvis 
sub-carinatis, minutissimé granulatis, marginibus posterioribus albo 
punctatis, areis — indistinctis; margine pubescente, rufes- 
cente, albo macula 
Long. fourteen twentieths, lat. nine twentieths of an 
inch. 
- Hab. waters of Mass. Bay. 
My own Cabinet. 
Cabinets of Bost. Soc. Nat. Hist., A. A. Gould, M. 
D., John C. Jay, M. D., (N. : 
Descmrerrow. Shell oblong-oval, slightly narrowed 
and depressed anteriorly, color varying in different speci- 
mens from clear, to yellowish or greenish and sometimes 
even blackish red, with numerous zigzag white lines upon 
the terminal valves, and zigzag undulating or flammulate 
markings of the same color thickly arranged over the rest 
of the valve; valves sub-carinate, covered with micro- 
scopic granulations, disposed in quincunx, and giving the 
shell, under a lens of moderate power, a resemblance to 
shagreen ; posterior edge of the valves marked with 
three or four white dots on each side ; increment indicated 
by very apparent concentric strie, which occasionally 
