GASTEROPODA. 323 
CHITON VESPERTINUS (Gould). 
Testa parva, sub-ovata, carinata, thalassina, intus rosacea, punctis 
triangularibus insculpta; areis linea elevata divisis ; valva antica 
lineis radiantibus octo notata ; valva postica parva, ad apicem emar- 
ginata, propé marginem umbonata; margine coriaceo, pilis raris 
induto. 
SHELL oblong, slightly ovate, carinate, deep sea-green, interior 
rosaceous at apex; the valves acutely pointed at apex, waved by stages 
of growth, areas divided by an elevated, smooth, or slightly undated 
line, and with a similar line at the posterior margin of the valves; 
both areas conspicuously punctured with triangular points, arranged 
for the most part along the lines of growth, and also having a radiating 
arrangement, the dorsal areas most punctured; anterior valve having 
eight delicate, raised, radiating lines, with corresponding undulations 
at the margin, one to each marginal fissure; posterior valve small, 
emarginate at tip; apex a minute point near the margin, sculptured 
with the lines of growth, rather than with the punctures; margin 
coriaceous, bearing a few, scattered, flaccid hairs, which would 
scarcely be detected in the dried state. 
Length an inch and a quarter; breadth seven-tenths of an inch. 
Inhabits Puget Sound, Oregon. 
Allied to C. Hindsii, Reeve, and cilatus, Sowb., in the form of the 
posterior valve, and very closely to the latter in size, colour, and the 
arrangement of sculpture; but in that shell the points are represented 
as granules, whereas in this they are decidedly triangular punctures ; 
and moreover, the difference of locality (New Zealand) would preclude 
the supposition of their identity. I suspect that some varieties are 
nearly impunctured, and, indeed, may be varieties of C. Merckiv, 
W osnessensk1. 
Figure 426, back of the shell ; 426 a, profile. 
