8 



PROCEEDINGS OF THE NATIONAL MUSEUM 



knob of posterior ridge; valve surface with scattered hairs; valve 

 margins with rows of long hairs faintly annulated proximally (figs. 

 4a, 6). 



Adductor muscle scars consisting of clusters of ovate scars near junc- 

 tion of radial ribs (fig. 4e) ; several ovate dorsal muscle scars occurring 

 below anterior termination of hinge; false radial canals numerous, each 

 with long bristle (fig. 46); normal pore canals sparsely distributed 

 over valve surface. 



1.0- 



I- 



X 0.8 



LU 



0.7 

 LU 



< 



^0.5 



0.4 



0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 



1.3 1.4 1.5 



CARAPACE LENGTH (mno) 



Figure 1. — Sarsiella zoslericola Cushman: relationship between shell length and height of 



female. 



Duplicature broad except dorsally; 1 or 2 small bare medial bristles 

 along anterior part (figs. 4a-e), 1 long and 2-6 short bristles medially 

 on caudal process, long bristle posterior to shorter bristles, all bristles 

 bare (figs, 'ij-j', 5a-d); 2-3 small bare bristles near inner margin of 

 duplicature dorsal to caudal process followed by 2 long hirsute bristles 

 near outer margin (figs. 4g; 5c); 1-3 short bare bristles near inner 

 margin of duplicature anterior to caudal process and posterior to a 

 cluster of 3 bare bristles (figs. 4^; 5c). Selvage narrow with trans- 



