28 ASTACUS. LOBSTER, Class V. 



14. LocnsTA. C. Locusta. Gm. Lin. 2992, Oniscus Gammarellus. Pal- 

 Looiisi. p^^^^ g^^^^ 2Q^2. las Misc. ZooL t. 14./. 25. 



Linn. Tr. ix. Q2. lab. 4. Jig. 1. 



*h. with four rather short antennce, one pair 

 about one third part longer than the other; 

 body of fourteen joints, very smooth ; on each 

 of the three last joints of the body is a small 

 fasciculus of spines ; claws four, imperfect ; legs 

 ten, the four anterior, smaller; caudal fins 

 five, subulate ; color sandy ; length about an 

 inch. 



Common on most of our shores. 



15. PuLEX. C. Lin. Syst. 1055. "No. 81. Herlst. Cane. ii. 130. t. 36. 

 ^^^'^^' Gm. Lin. 2992. f.i.5. 



Linn. Tr. ix. 93. t. 4,/. 2. 



L. with five pair of legs, and two pair of claws 

 imperfect ; with twelve joints in the body. 



Very common in fountains and rivulets; 

 swims swiftly in an incurvated posture on its 

 back ; embraces and protects its young between 

 the legs ; does not leap. 



* Resembles much the C. Locusta; is about 

 half its length ; wants the fasciculi of spines ; 

 the color paler, and sometimes tinged with 

 green. 



