M. II. S„ Photo. 



Plate [I.— "Lake Shrimp" {Penaeu* wtifnun). 



The body, as is shown in the accompanying figure {PI. II), is 

 very much compressed, giving the body an extremely slender 

 appearance. It is covered with a firm, tough outer skin, or shell, 

 which corresponds to iliat of the common market era'), although 



it never becomes as hard and Hrin as it does in the latter form. 



The body is composed of two main regions (as is shown clearly 



in Platra I and II). the anterior head region and the posterior 



