56 J. R- KiNAHAN on the Britannic Species of 



Cv. angusticauda*. Somites (?); telson bicarinato-sulcate. 



Cr. Pattersonii. 5th sculptured ; 6th obsoletely carinated ; telson 

 sulcate. 



Cr. spinosus. 1-4 carinated ; 5th sculptured ; 6th obsoletely bica- 

 rinated ; telson sulcate. 



Cr. boreas. 1 and 2 sculptured ; 3-5 carinated and sculptured ; 

 telson bicarinato-sulcate. 



Cr. Capensis. 6th obsoletely sculptured ; telson (?) 



Cr. nanus (?). 



Cr. miinitus. Abdomen smooth (?) 



This division is easily separated from ^geon by the character of the 

 rostrum. 



In Crangon, as here restricted, there are two groups which are 

 doubtfully sub-generic Crangon, and Steiracrangon. In Cran- 

 gon Proper the somites are all smooth, the telson rounded above, 

 and not sulcated. In Steiracrangon some of the somites are 

 keeled, and the telson is sulcate. 



Crangon. {Steiracrangon) 



Cr. nigricauda. 6th somite keeled ; telson sulcate. 



Cr. aj/inisf. Somites (?) ; telson sulcate. 



Cr. AUmanni. 6th somite bicarinated ; telson sulcate. 



Cr. propinquus. 3rd and 4th somite keeled ; telson (?). 



Crangon. 



* '^ . > telson and somites smooth. 



Cr. r ranciscorum. j 



* Crangon angusticauda De Haan. Pedibus secundis et tertiis ocqualibus, thorace convexo 

 carina media bispinosa, Carinis lateralibus tribus obtusis abbreviatis abdomen sensim angustiore. 

 Rostrum adscendens obtusum sulcus transversus pone medium articulorum articulus septem bi- 

 carinatus medio sulcatus. 



t Crangon aiEnis De Haan. Thorace ante medium trispinosa, spinis aiqualibus, Abdomine 

 sensim angustiore articulo septimo valde angusto medio sulcato utrinque obtuse angulato quasi 

 biannulato. Cr. vulgari proximus. In hue specie vero spinte laterales thoracis media majores. 

 Maxilla: quintae laminis antenna inferiores et pedes quinti pedibus primis breviores abdominis 

 articulus Septimus sulcatus. 



