136 Mr. C. Spence Bate on British Edriophthalmous Crustacea, 



Subgenus 3. Orcliestia, Leach. 

 First pair of feet simple in neither sex. 



1. 0. littorea. The first pair of hands minute, subcheliform in 



both sexes ; second pair large and powerful in the male, 

 feeble and similar to those of Talitrus in the female. 



Rocky shores all round Europe, including the Crimea, at high- 

 water mark. 



2. O. Deshayesii. Hand of the second pair of feet having the 



posterior portion of the palm armed with a strong tooth. 

 Plymouth, Dr. E. Moore. 



3. O. IcEvis, mihi. Second hand in male long and triangular, 



and without a thumb or tooth on the palm, 

 Swansea, C. S. B. 



Genus 2. Allorchestes, Dana. 



Upper antenna about half the length of the under. The basal 

 joints of lower antenna not completely fused into the facial 

 wall of the head. Olfactory spine rudimentary. The first two 

 pairs of feet subcheliform. Mandible non-palpigerous. 



1. A. Banai, nvihi. Upper antenna reaching to the termination 



of the peduncle of the inferior ; the lower one-third the 

 length of the animal. The first pair of feet considerably 

 smaller than the second ; the posterior edge of the palm 

 of the latter terminating in an obtuse point. 

 Moray Frith, Rev. G. Gordon. Penzance, G. Barlee, Esq., 

 W. Webster, Esq. Falmouth, W, Webster, Esq. 



2. A. imbricatus, mihi. Upper antenna longer than the peduncle 



of the lower. The central edge of the dorsal surface keel- 

 shaped, each of the segments being surmounted by a small 

 tubercle. 

 Penzance, G. Barlee, Esq. 



Genus 3. Galanthis (mihi). 



Lower antenna scarcely longer than the upper. Mandible 

 non-palpigerous. Posterior pleopoda Orchestiform. Telson 

 divided. 



1. G. Lubbockiana [mihi). Antennse subequal. Hands of both 

 pairs of gnathopoda subcheliform and subequal. 

 Falmouth, W. Webster, Esq. Penzance, — ■ Harris, Esq., 

 G. Barlee, Esq. 



