23 



13. Alphens hi It rutin lis (Say). 



The so-called "Pistol Crab," from its habit ui" making a 

 sharp, cracking noise with its modified chela. Is common 

 along the coast in sea weed and among the shells of the 

 oyster reefs. 



14. Sergestes arcticus (Kroyer). 



A small shrimp-like form which is at times very abundant 

 in Calcasieu Pass. As yet only partly grown specimens have 

 been taken. It has a general resemblance to the young 

 individuals of Penaeus setiferous, but may be distinguished 

 from them by the greater length of the antennae and the 

 different shape of the body. 



15. Ogijris occidentalis (Ortman). 



A slender shrimp-like form which was found in the shallow- 

 water along the beach near Calcasieu Pass. Only a few 

 specimens have been found. 



16. Chloridella empusa (Say). (Plate VI) 



Although this is not a shrimp, but rather a distant relative 

 of them, it is included in the present list, as it is often taken 

 by the shrimp fishermen, who call it the "King Shrimp." 

 The remarkable shape of the body is shown in the accompa- 

 nying figure, which is of a small individual. 



