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Subgenus Oalluoi^^a Dall, 

 PnAGOIDJSS (GALLUai::^) PAUPEHATUS ( Guppy ) 



Luoins -paiiperata Gupp^-, in Guppy and Dall, 189G, Proc. U. o. 



Hat. ilua., vol. 19? -. _, -1. ^0, -' . Z, 

 ?h a GO ides ( Oalluoiaa ) pauperatus ( Guopj ) Dall, 19 OS, Trans. 



V/agner S'ree Inst. 3si., Philadelphia, vol. 5, pt. 6, 



p. izao. 



Description .- "Suh orbicular,, not very convex, with faint, 

 broad radiatiri^ {ray-lilce) grooves and sublainellar concentric 

 ridges. Diameter, 11,5 ran. The radiating ornament looks li^re 

 color, but it is really faint, shallov/ f lutings," (Guppy, 1896) 



Shell of medinjn size, v/ell inflateiT, suborbicoJ] ar, being slight- 

 ly Ciore produced anteriorly; ant ero-dorsal margin verv short, 

 slightly excav-tea, upper portion of the antero-lateral margin ob- 

 licjuely subtruncated; posteriorly almost' vertically subtruncated; 

 umbones tumid, but lov7; anterior and posterior dorsal areas poor- 

 ly defined; lunule narrow, shallow, of variable length, often- 

 absent or poorly developed on the left valve; external sculpture 

 of fine, often unequally emphasized, closely spaced concentric 

 rugae, becoming sharp and sublamelloEe to?:ard the raargins aiid on 

 adult shells not infrequently obsolete on. the dorsal r;iediaja portion 

 of the shell, in whiel. case the concentric sc^ilpture consists of 



