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Order P I? I IT D E 3 M A 3 E A . 



Superfamily IIUOULACEA 

 Ti'araily ITuculidae 

 Genus NUOUIA lamarofe 

 Subcrenus Fucula s. s. 



NUOULA MORAITTMA n. sp. 



Description .- Shell small, subtrigonal, moderately inequi- 

 lateral, moderately inflated; anterior margin gently convex, 

 rounding rapidly into the symmetrically arcuate base; posterior 

 margin shorter, m th a steeper slope and slichtly more convex 

 curve, insinuated below by the impingment of the boundary of the 

 impressed area behind the umbo; umbones moderately prominent and 

 opisthogyra-e, placed behind the me-^ian yertical;, area behind 

 the umbo definitely impressed, relatively large, cordate; exter- 

 nal sculpture of coarse and strong concentric rugae and less con- 

 spicuous and finer radials which on ad;ilt shells fail to over- 

 ride the rugae; the scalptiire of the posterior irrpressed area sim- 

 ilar to that of the remainder of the shell, but weaker; chondro- 

 phore narrow, oblique; hinge heavy for the si-'e of the shell, ant- 

 erior series consisting of about ten teeth, slightly arcuate; post- 

 erior series shorter, straight, including about six teeth; inner 

 marp-in of the vslve finely crenulated. 



Mrensions.- Length, 4.8 mm.; alt. 4 ::m. ; semi-diam. .9 mm. 



