152 HISTORY OF BRITISH CRUSTACEA. 



Gen. 54. II ALIA, Spence Bate. 



Carapace elongated, compressed, covering the thorax, 

 except the three posterior segments. The four hind legs 

 without an appendage. Central tail-piece rudimentary. 

 Upper antenna prominent, lower membranaceous. 



Halia trispi^osa, Goodsir, sp. — Carapace long, much 

 compressed, its dorsal ridge surmounted by two or some- 

 times three spines ; the ambulatory division of the first 

 pair of legs extremely short ; the second thoracic segment 

 well developed. 



Firth of Forth (Goodsir); Moray Firth (Rev. G. Gordon). 



Gen. 55. BODOTRIA,* Goodsir. . 



First to fifth abdominal segments each armed with a 

 pair of bifurcated Unlets. Two terminal scales of caudal fins 

 single-jointed. 



BoDOTRiA arenosa, Goodsir. — Carapace nearly oval, 

 beak wanting ; upper antennae quite obsolete, lower of con- 

 siderable length, ending in two long spines. Length five 

 lines. — In the Firth of Forth (Goodsir). 



* The Latin name for the arm of the sea in which Mr. Goodsir found the 

 species. 



