58 J. R. KiNAHAN on the Britannic Species of 



family ; antenna] scale short. Species : JEg. fasciatus, sculptus, carinicauda, 

 cataphr actus. 



Of all these genera we have representatives in the Britannic area, which 

 also occur in the Irish seas ; and, with the exception of one (Ch. trispinosus), 

 all have occurred to me on the east coast, either in the northern or eastern dis- 

 tricts (for general distribution, vide infra). 



DESCRIPTION OF SPECIES. 



Genus I. 



CRANGON. 



Carapax la3vis dente gastrico mediane stcpius, et dente branchialo utrinque 

 armatus. Rostrum breve pedunculo oculorum non superans. Somites (seg- 

 menta) abdominales supernc lajves. Telson (segmentum ultimum) superne 

 planum. Chelipedes (pedes ambulatorii) par primum satis grandes, subcheli- 

 formes, par secundum minuti debiles, pare primo longitudinem tequantes didac- 

 tyli. Paria tertia ad quinta acuminata. 



1. Crangon vidgaris (Fabricius sp.). 



C. Rostro perbrevi, apicc rotundato supcrue excavato, orbites totum cir- 

 cumciliatis. Carapace dentibus gastrico brachialibusque armato. Abdominis 

 somitibus lajvibus. Telson lajve. Chelipedum pare secundo, paribus prinif) 

 tertioque asquante, meros dentato. (Syn. Cr. septemspinosa (Say.) Cancer 

 Crangon (Seba). 



Subgenus Steiracrangon (milii). Carapax ut Crangon. Somites abdominis 

 ad 5tum supra lajves sextus superne canaliculatus ; telson supra sulcatum. 



2. Crangon {Steiracrangon) ., Albnanni (Kin.) 



Cr. Rostro brevi, apice subrotundato superne excavato. Orbitis totum cir- 

 cumciliatis carapace ut Cr. vidgaris. Abdominis somite sexto bicarinato, sul- 

 cato. Telson supra sulcato, somitibus aliis lajvibus. Chelipedibus ut Cr. 

 vidgaris. 



