bo 
THE NAUTILUS. 
This species is less inflated, less polished, with finer grooving and 
less recurved rostrum than J. ce/ata. It is heavier, more inflated, 
and with a coarser hinge plate and larger teeth than LD. confusa 
Hanley (L. pella Sby. non Lin.) from Japan. 
Leda leonina n. s. 
Shell rather thin, compressed, with the low beaks at the anterior 
third ; base slightly arcuate, anterior end rounded, posterior dorsal 
slope concave, lunule and escutcheon narrow, elongate, strongly im- 
pressed, smooth, with the valve margins elevated ; rostrum broadly 
and a little obliquely truncate ; sculpture of thin sharp concentric 
lamelle strongest on the rostrum, epidermis dull olive-gray, dehis- 
cent; hinge with 22 anterior and 28 posterior teeth, the chondro- 
phore small, inconspicuous. Height 11; length 23°5; diameter 
5°25 mm. 
Off Sea Lion Rock, Coast of Washington in 477-559 fathoms, 
mud, U.S. Fish Commission. 
This species bears a distant resemblance to L. tenuisulcata Se 
cannot be confounded with it. e 
Leda conceptionis n. s. 
Shell elongate, smooth, polished, compressed, with the beaks in 
the anterior third ; base arcuate, prominent below the beaks ; ante- 
rior dorsal slope slightly rounded, posterior slope straight, rostrum 
narrow, pointed, obliquely truncate, cardinal margin elevated be- 
tween the halves of the narrow impressed, almost linear lunule and 
escutcheon ; beaks very small, low, the prodissoconch. conspicuous ; 
hinge with 18 anterior and 33 posterior small and delicate teeth ; 
the chondrophore narrow, produced posteriorly, interior of the ros- 
trum without a longitudinal septum. Height 10°5; length 27-5; 
diameter 4°5 mm. 
From Sannakh Islands, Alaska, to the Santa Barbara Channel 
in 200-500 fathoms, especially off Point Conception, Cala., in 278 
fathoms, U.S. Fish Com. 
This is nearest to L. platessa Dall, from off Rio Janeiro, but that 
species is smaller, with much fewer teeth and has a strong septal 
ridge dividing the interior of the rostrum. 
Leda pontonia Dall, originally described from 812 fathoms off 
the Galapagos Islands, has since been dredged in 822 fathoms ‘off 
San Diego, California, thus adding another to the rapidly increas- 
ing list of species which occur off the coast of West America in both 
hemispheres. 
