1. '08. 



10 



The tables on this and the preceding pages will give an idea 

 of the Atlantic and extra-Atlantic distribution of the species 

 known from British and Irish waters. From these it will be 

 seen that of fiftj'-four species, nineteen have been found north of 

 the Arctic Circle, while twenty-six occur in the Mediterranean. 



Five species of British and Irish Natantia (four of which 

 have not been found S. of Scotland) are known to live on the 

 bottom in water below freezing point. These are 



Pandalus horeaUs. 

 Spirontocaris poJaris. 



Sahinea Sarsi. 



Spirontocaris spinus. 

 Spirontocaris Gaimardi. 



Other species, now known to be bathypelagic, have been 

 recoided from localities with temperatures below 0°C., but 

 it is extremely likely that in all these cases (with the possible 

 exception of Hymenodora glacialis) the specimens were swim- 

 ming in much warmer layers w^ell above the bottom and were 

 caught during the ascent of the net. 



EXTRA-ATLANTIC DISTRIBUTION OF BRITISH AND IRISH 



DECAPODA NATANTIA. 







CC 



w. 



c 

 ce 



1 



6 



Bay of Bengal and Andaman 

 Sea. 



East Indies. 



,ce 



le 



a 



CS 



cd 



^3 



ce 

 le 



N 



1— 1 



1 



'3 

 ce 



p 



02 



Okhotsk Sea. 



Behring Sea and Alaska. 



British Columbia to San 

 Diego. 



1.4 



o 

 <e 



3 

 o 



o 



o 

 a> 

 ft 



1 



Sergestes robustus 















V 







X 



X 



X 

 X 



Sergestes arcticus 











X 





Pasiphae sivado 







X 





Pasiphae princeps 







Acanthephyra purpurea . . 









X 



X 



X 



X 



X 

 X 





Acanihephyra dehilis .... 















Ephyrina Hoskyni 



Eyhyrina Benedicti 



X 



X 



X 









Hymenodora glacialis .... 



















X 



— 



X 

 X 



X 



Nematocarcinus ensifer . . 

 Pandalus horealis 



X 





X 









X 



X 











X 



X 



X 



X 

 X 

 X 

 X 



X 

 X 



? 



Pandalus Montagui, v. tri- 

 dens 



















Plesionika martia 



Spirontocaris spinus 



X 



X 



X 



X 



X 



X 



X 







Spirontocaris Oaimardi . . 





















Spirontocaris polaris .... 





















Spirontocaris pusiola .... 





















Alpheus ruber 













? 









Alpheus macrocheles .... 













Athaiuis nitescens 





X 

 X 













X 







Processa canaliculaia .... 





1 













, 







