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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:no§a, 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 finlets. 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. 
