125 
concave; posterior extreme bluntly pointed; escutcheon large, 
transversely striate; lunule not differentiated but similarly stri- 
ate; sculpture of fine sharp, concentric grooves with wider inter- 
spaces, less arcuate than the incremental lines; chondrophore ° 
small, triangular, not projecting, with 22 anterior and 16 poste- 
rior hinge teeth on the cardinal border. Height 10.5, diam. 7.2, 
length 15.5 mm.’’—Dall, Nautilus 10:1. 
1695 Leda leonina Dall. 
“Shell rather thin, compressed, with the low beaks at the an- 
terior 3d; base slightly arcuate, anterior end rounded, posterior 
dorsal slope concave, lunule and escutcheon narrow, elongate, 
strongly impressed, smooth, with the valve margins elevated; 
rostrum broadly and a little obliquely truncate; sculpture of thin 
sharp concentric lamell# strongest on the rostrum, epidermis dull 
olive-gray, dehiscent; hinge with 22 anterior and 28 posterior 
teeth, the chondrophore small, inconspicuous. Height 11, length 
23.5, diam. 5.25 mm.’’—Dall, Nautilus 10:2. 
Type locality:—off Sea Lion Rock, Wash., in 477-559 fms. 
1696 Leda conceptionis Dall. 
Shell elongate, smooth, polished, compressed, with the beaks 
in anterior 3d; base arcuate, prominent below the beaks; anterior 
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 con- 
spicuous; hinge with 18 anterior and 33 posterior small and deli- 
cate teeth; the chondrophore narrow, produced posteriorly; inte- 
rior of the rostrum without a longitudinal septum. Height 10.5, 
length 27.5, diam. 4.5 mm.’’—Dall, Nautilus 10:2. 
From Sannakh Islands, Alaska, to the Santa Barbara channel 
in 200-500 fms., especially off Point Conception, Cal., in 278 fms. 
1697 Leda pontonia Dall. 
Off San Diego, Cal., in 822 fms. Galapagos Isl. in 812 fms. 
1698 Punctum conspectum Pasadenze 
“Shell resembling P. conspectum Bland, but more widely and 
openly umbilicated, and without spaced riblets, or with them very 
slightly indicated.’’—Pilsbry, Nautilus 10:21. 
Type locality:—Pasadena, Cal. (Delos Arnold). 
Treated later as a valid species. 
1699 Newcombe, C. F. 
Some new or rare species of marine mollusca recently found 
in British Columbia. Nautilus 10:16-20. 
Extends the known range of several Californian species. 
1700 Mopalia imporcata Cpr. 
Pilsbry, Nautilus 10:49, describes a color variety, larger than 
the type, from San Pedro, Cal. (T. S. Oldroyd), as follows:—‘‘The 
single specimen measures 9 by 18144 mm., and is somewhat more 
elevated than the type; color pale olivaceous, white toward the 
girdle, speckled on the ribs of lateral areas with brown, and with 
a brown patch on each pleural tract. The teeth are very distinctly 
thickened along the outer edge of the slits, as in the typical Cal- 
listochitons. Sculpture typical.”’ 
1702 Ischnochiton scabricostat Cpr. 
Pilsbry, Nautilus 10:49, describes a form from San Pedro, 
