feebly inrnressed; external surface sculp tiirr^ with d ivari casting- 

 striae, passing- o-olicuel^v over the ^restcr part of the shell, 



gently flexed n/Dv/ard aL on? a rpdial line in the anterior third; 

 behind v^hich the striae are finer and sharply angiilatel once 

 or twioe, forming a zigzag soiilptiure; hin^'-'e with a povSterior and 

 anterior lateral in each valve, tv.o ri^^-^-'- '^--^rdi-.als, the posterior 

 iarg-er and obscurely bifid, t',vo left cax'dinals, the anterior 

 small and scarcelj^ differentiated from the margin. 



Dimensions .- length, 7.5 :;im. ; alt., 6.5 i-im. ; seraidiam., 2.5 



3emar]£S.- The characteristioally sciUptured valves of this 

 species ax^e numerous -..x... j^.... "t be confused v/ith any ot'-er raem- 

 bcr of the fau^ia, the Divaricellas, the only Other divaricately 

 sculptitred forms, h- ving an orbicul.v.r outline ai,id the sanie type 

 of soul'ture over the entire dislt. The largest valve has the 

 following dimensions: length, 9.5 mm.; alt., 3.5 mm.; diam. , 

 2.7 mjp.. The sharp ahange in soTi!.pture poBtoriorly occitrs on a 



line alo"Ag which, in some s ecimens, a slin-ht ridge Is developed. 

 The posterior sculptiixe is variable, being sharply anf^ulate, 

 once or tv/ice , or merely passing to the nargin at a sharp angle. 

 Young valves are more orbicular fchan adults. 



Dall (1) renBrked that Ouppy reported 3_. carina from Bov:- 



( 1 ) . loo . c i t. , TrajTB . '.Vagne r Inst , , 1900. 



