46 THE NAUTILUS. 
inch), and agreed in its rather long and narrow form and impressed 
sutures with fig. 85 of plate 14 of the Manual of Conchology. 
The Nuttalli (named in honor of the naturalist whose name is so 
familiar to botanist, conchologist and ornithologist alike) was col- 
lected at the same locality, and was stated to differ in being wider, 
depressed, the valves squared where they join the girdle, the latter 
not projecting between them to form deep sutures. The type meas- 
ured about 26}x20 mm. This is the form figured by me on pl. 14, 
fig. 84 of the Manual. 
It is not at all difficult to pick out specimens of this short, broad 
form, or of the longer, narrower form, even more pronounced in 
character than Carpenter’s types; but trouble begins when we come 
to the intermediate examples. In one lot of 18 specimens recently 
received from Miss Shepard, 6 are typical Nuttal/i; 8 are more or 
less typical Hartwegii; but it would puzzle a Philadelphia lawyer 
(or conchologist either) to tell what the other specimens are. The 
same extremes and intermediates occur in many other trays of 
specimens I have seen from various localities; so that one cannot 
doubt that the two forms named by Carpenter are merely the varia- 
tions of one species, and are not correlated with differences of station 
or geographic range. 
All of the specimens are dull greenish, gray or even black, the 
lighter forms generally having a row of dark blotches on each side 
of the dorsal ridge; and seen under a lens, all are minutely but 
sharply granulated, with coarser granules scattered irregularly over 
and among the smaller ones, especially on the lateral areas; and 
they are all rather deep colored inside, varying from “ Robin-egg ” 
to “ Catbird-egg” blue. 
Some months ago, the writer received from Mr. W. J. Raymond, 
fourteen specimens of Cyanoplax, which differ so markedly from the 
species discussed above that that they must form a distinet species. 
After reaching this conclusion the shells were put aside, for one is 
slow to describe new littoral shells from so well worked a locality as 
middle California; but renewed study of them convinces me of the 
necessity of the step. 
Trachydermon (Cyanoplax) Raymondi n. sp. 
Shell longer and narrower than 7. Hartwegii. Back somewhat 
keeled, varying in elevation. Color (1) olivaceous green mottled 
with white, sometimes with dark lateral streaks as in Hartwegii, 
