SARSIELLA — KORNICKER 



11 



Figure 4. — Sarsiella zostericola Cushman, Hadley Harbor, Mass., 9, 1-26 mm: a, medial 

 view right valve (broken circle encloses muscle scars) ; b, anterior part of right valve showing 

 small bristle on inner lamella and marginal bristles; c, anterior part of left valve; d, 

 ventral part of right valve showing clusters of spines; e, muscle scar area of left valve; 

 /, caudal process of left valve; g, caudal process and posterior margin of right valve. 

 Female, 1.30 mm: h, caudal process of left valve. Female, 1.25 mm: i, caudal process 

 of right valve. Female, 1.30 mm: ;', caudal process of right valve. (Lamellar prolonga- 

 tion not shown in b, h, i; same scale in microns: a; b-d; e, g; f, h-j.) 



