Mr. C. Spence Bate on British Edriophthalmoiis Crustacea. 147 



Subfamily 1. PODOCERIDES. 

 The peduncle of the upper antenna much shorter than that of 

 the lower. Lower antenna very strong, and used in climbing. 

 Last pair of pleopoda terminating in short strong hooks. 



Genus 1. Pleonexes (mihi.) 

 Upper antenna without secondary appendage. Peduncle of 

 the lower antenna reaching nearly to the extremity of the upper 

 antenna. The gnathopoda subcheliform. Posterior pereiopoda 

 prehensile. 



1. P. Gammaroides. Lower antenna not pediform. Second gna- 

 thopod with hand nearly square and larger than the first. 

 Penzance, G. Barlee, Esq. 



Genus 2. Amphitoe (Leach). 



Filament of the upper antenna long and slender ; filament of 

 lower not pediform. Gnathopoda subequal. Posterior pereiopoda 

 subpreheusile. Posterior pair of pleopoda with one branch ter- 

 minating in hooks, the other squamiform. Telson simple. 



Build nests made of weed and material of their own secretion. 



1. A. rubricata (Montagu). Filament of the upper antenna ex- 



tending far beyond that of the lower. 

 Plymouth, Col. Montagu, C. S. B. Strangford Lough, Thomp- 

 son {Ann. Nat. Hist. Oct. 1847). 



2. A. littorina (mihi). 



A. punctata, Johnston (not Say). 



Antennae subequal. Construct nests with a material appa- 

 rently secreted by the animal. 



Coast of Berwickshire, Johnston {White's Catalogue of the 

 British Crustacea). Spring Vale, co. Down, Thompson {Ann. Nat. 

 Hist. 1 847) . Plymouth, C. S. B. Probably all round our coasts. 



Genus 3. Sunamphitoe (mihi). 

 Second gnathopod larger than the first. Posterior pleopoda 

 with one branch squamiform, the other terminating in two hooks. 

 Telson terminating in a single strong hook. 



1. S. Hamulus {mihi). Antennae subequal. Posterior pereiopoda 



scarcely prehensile. 

 Moray Frith, Rev. G. Gordon. Penzance, — Harris, Esq. 



2. S. conformata (mihi). Upper antenna longer than the lower. 



Posterior pereiopoda subpreheusile. 

 Plymouth, C. S. B. 



10* 



