THE CRAYFISH AND ITS ALLIES 



111 



The economic im- 

 portance of the Deca- 

 poda may be inferred 

 from the fact that 

 the receipts for the 

 lobster alone, taken 

 and sold by United 

 States fishermen, is 



Fie, 106. - Gelasimus pugnax. Nat. size. estimated for 1892 

 Fronto-dorsal view. Photo. l>y W. H. C. P. 



at one million dollars. The yield 

 to Canadian fishermen was in ad- 

 dition worth half a million dollars. 

 From the United States Fish Com- 

 mission Bulletin for 1890-91 we 

 find that the bine-crab fisheries on 

 the Atlantic and Gnlf coasts re- 

 turned almost half a million dol- 

 lars, while the shrimp catch in the 

 same waters brought nearly a 

 quarter of a million dollars more. 

 The latter industry on the Cali- 

 fornia coast is much greater, for 

 the shrimp trade of San Francisco 

 Bay alone is valued at a quarter of 

 a million dollars yearly. 



The remaining orders of Mala- 

 costraca maybe briefly mentioned. 

 The Stomatopoda 1 include only 



FIG. 107. Squt/la empusa, the 



Sqililla, 2 the mantis shrimp, SO mantis shrimp. Dorsal aspect. 



From Bigelow. 



1 (rr6/xa, mouth ; TTOUS, foot. 



2 <7/d\Aa, classic name for a marine crustacean. 



