ALLORCHESTES. 163 



glossy. Head small. Hand of first pair minute, subcheli- 

 form in both sexes ; hand of second pair of feet very large 

 in male, feeble in the female ; front edge oblique, convex. 



Common on our sandy coasts, and having the same habits 

 as the Talitrus. 



Orchestia Deshayesii, Audouin. — Hands of second 

 pair of legs strongly arcuate above ; their front edge very 

 oblique, concave, and ending in a prominent pointed tooth, 

 so as to be almost semilunar. 



Rare on the southern coast (Plymouth). 



Orchestia l^evis, Spence Bate. — Second hand in the 

 male long and triangular, and without a thumb or tooth 

 on the palm. 



Found at Swansea by Mr. Spence Bate, who first de- 

 scribed it. 



Gen. 60. ALLOBCHESTES, Dana. 



Upper antennae about half the length of the lower ; the 

 basal joints of the lower not completely fused into the facial 

 wall of the head. Olfactory spine rudimentary. Eirst two 

 pairs of feet subcheliform ; mandible without palpi. 



Allorchestes Danai, Spence Bate.* — Upper antenna 



* Annals and Magazine of Nat. Hist., Feb. 1857. 



