2 THE NAUTILUS. 



This species is less inflated, less polished, with finer grooving and 

 less recurved rostrum than L. ccelata. It is heavier, more inflated, 

 and with a coarser hinge plate and larger teeth than L. confuta 

 Hanley (L. pellu Sby. non Lin.) from Japan. 



Leda leoniiin n. s. 



Shell rather thin, compressed, with the low beaks at the anterior 

 third ; base slightly arcuate, anterior end rounded, posterior dorsal 

 slope concave, luuule 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 

 lamella? strongest on the rostrum, epidermis dull olive-gray, dehis- 

 cent ; hinge with 22 anterior and 28 posterior teeth, the choudro- 

 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. t> iiiii^n/cntn but 

 cannot be confounded with it. 



Leda eoneeptionis u. s. 



Shell elongate, smooth, polished, compressed, with the beaks iu 

 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 prodissocouch 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, Gala., in 278 

 fathoms, U. S. Fish Com. 



This is nearest to L. jilatesxa 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. 



Ledn jii'iitonia Dall, originally described from 812 fathoms off 

 the Galapagos Islands, has since been dredged iu 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. 



