7 
21:00388 Creutt, C. R. (editor): Molluscan World, volume one, 
1915. 
This book of 270 octavo pages, cloth, describes 400, and 
enumerates avout 3100 genera, species and varieties of shells, 
chiefly West American. Aliso issued as volume twenty, whoie 
numbers 140 to 157 inclusive, of the West American Scientist. 
Weight by parcel post 1% lbs. packed. $3.00 net, unbound. 
21:00389 Batl: Recent bivalve mo!l, of northwest coast of Amer. 
This checklist issued in 1916, contains about 474 species and 
varieties, 86 of which have never appeared in any previous enum- 
eration of the fauna. Pubiished by the Southwest Museum, Los 
Angeles, Cal. 
21:0640 Dail, Wiiliam Healey: Diagnoses of new species of ma- 
rine bivalve moilusks from the northwest coast of America 
in the collection of the United States Naticnai Museum. (Hx- 
tract from the Proc. 52:393-417.)). 
This paper describes avout 50 species from the Californian 
coast. The cther new species are from more northern or south- 
ern waters. In the foeilowing iist the type localities are given, 
but only the descriptions of the Californ:an species are reprinted. 
Nos. 21:41-1365. 
21:0041 Nucuia cardara Dall. Off San Diego, Cal. 
Sheil poiished, light olive-green, thin, elongate-oval, with 8 
anterior and 18 posterior prominent teeth, the resilifer prominent 
and largely free from the hingeline, the interior very pearly, the 
valve-margin smooth, the beaks hardiy prominent, situated 5 mm 
behind the anterior end of the gheil and showing the whitish pro- 
Gissocench. Length 16; height 11.5; diameter 8mm. Monterey, 
Cal,, to Baja, Cal. 
21:0042 Nucwa darella Dall. Off San Diego, Cal. : 
Shell smail, inflated, subtriangular, the anterior end slightiy 
shorter, pericstracum dark olive, the surface smooth except for 
somewnat irreguiar, incouspicuous incremental lines, but under a 
lens showing faint close radial striae, lunule large, distinctly 
limited by an impressed line, mesiaily with a slight pout; about 5 
anterior and 8 posterior hinge teeth, the resilifer deep, small, 
central, not projecting; inner margins of the valves sharply radi- 
aily grooved; beaks pointed, showing the prodissoconch plainly. 
Length 4, height 3, diameter 2.7 mm. 
21:0043 Nucula Linki Dall. Off Point Fermin, Baja Cal., Queen 
Charlotte Sound to Guaymas, Sonora. 
231:0044 Nucula aairica Dail. Chugachik bay, Alaska. 
21:0045 Nucula petriola Dall. Off Santa Rosa Isiand, Cal., in 53 
fathoms. 
Shell minute, ovate, inflated, the form resembling Crenella 
columbiana, the prodissoconch visible on the rather inflated beaks; 
lunule obscure; color greenish clive, smooth and polished; valve 
margins smooth, hinge line very short. Length 1.25, height 2, 
diameter 1.05 mm. 
21:0045 Leda navisa Dall. Off Farallones Islands, Cal. 
Shell elongate, arcuate, inequilateral, with slender recurved 
rostrum and weil-marked smooth impressed escutcheon but no 
lunule; base convexly arcuate, rostrum obliquely truncate, an- 
terior end eveniy rounded; beaks obscure, 5.5 mm from anterior 
end; sculpture of numerous sharp concentric low ridges, with 
wider flat interspaces, obsolete rostrum; anterior teeth about 12, 
