278 A HISTORY OF EECENT CKUSTACEA 



iylus, Kossmann, was established to receive the 

 Mediterranean species, Gastrosaccus Normani, Sars, which 

 is also found off the coast of Ireland, and a Red Sea species, 

 Huplostylus eri/thr^ts, Kossmann, the generic distinction 

 consisting in the absence of the forward directed lobes on 

 the concave hinder rim of the carapace, which are found in 

 the species of Gastrosaccus above mentioned, and also in 

 the reduction to a rudiment of the inner natatory branch 

 of the third pleopods of the male. 



It will be seen from the foregoing notes that fifteen 

 genera of this family are represented in the Fauna of Great 

 Britain, and it is quite possible, and even probable, that 

 extended research may show that others of the genera 

 and species occur round the very varied coasts of the 

 British Isles, which in their southern parts, especially if 

 the Channel Islands are included, are in rather marked 

 contrast to the region of the Orkneys and the Shetland 

 Isles, among which Norwegian and Arctic forms may 

 readily present themselves. It will be understood that, 

 although an endeavour has been made to mention all the 

 valid, or at least all the commonly accepted, genera of the 

 Schizopoda, there are very numerous species belonging to 

 those genera of which it has been impossible to take 

 notice. 



