Class V. ASTACUS. LOBSTER. 27 



Sowerhy Brit. Misc. 47. /. 23. 12. Spinus. 



Spine-backed, 



*L. with four antennaz above half the length of 

 the body; thorax with a serrated ridge, and 

 a tooth on each side of it ; third joint of the 

 body with a spine ; caudal fins five, the mid- 

 dle one subulate, the others oblong-oval, cili- 

 ated at the edges ; length about one inch and 

 three quarters. 



Found among oysters on the Scottish coast. 



Lin. Tr. vii. 66. t. 6.f. 3. Merum animalculum in coral- 13. Phasma. 



C. linearis. Gm. Lin. 2992. linis, &c. Baster. i. 43. tab. Phantom. 



C. Atomos, Lin. Syst. 1056. ^-fig- U- 



Br. Zool. iv. p. 21. t. xii./. 



32. 



*L. with four antennae, the upper pair of near- 

 ly the length of the body, the other pair half 

 that length, with two unequal pairs of cheliform 

 palpi, or feelers; two large imperfect claws, 

 and six legs ; body slender of six joints, the first 

 joint armed with two spines, the second joint, 

 and the head, with one spine each, all pointing 

 forwards. Color olive-green. Length three 

 quarters of an inch. Tab. xiii. Jig* % 



