the British Pandalidaj. 39 



Occurrence. — This species, which ranges from Norway to 

 the Adriatic, appears to occur all round our coasts. It is 

 commoner on the west coast (Clyde, 5-40 fathoms : Hender- 

 son) , but it also occurs on the east coast (Firth of Forth, rare : 

 T. IScott; Firth of Tay, 1 sp. : W. T. C). Norman records 

 it as very abundant in Shetland (" Last Rep. Dredging, 

 Shetland," Rep. Brit. Assoc. 1868, p. 265), and it extends to 

 the south of England (Plymouth). 



The following table will serve for the ready determinatioa 

 of the four British species of Pandalidas : — 



I. Roatriun longer than carapace, amied above 



■with spiuules only. 



1. Third maxilliped without exopod. 



a. Carpus of second perseopod on right side 



with many (20) aunulatious. Antenual 

 scale not much narrowed in front, outer 

 edge straight Pandalus Montagui^ 



b. Carpus of second perfeopod on right side [Leach. 



with 4 aunulations. Anteunal scale 



very narrow in front, outer edge concave. Pandalus propinquus, 



2. Third maxilliped with exopod. Carpus of [G. 0. Sars. 



second peraeopod, right side, with 4 aunu- 

 lations Pandalus Bonnieri, 



II. Rostrum half the length of carapace, armed [Caullery. 



above with spines and teeth. Third maxilli- 

 ped without exopod. Carpus of second 



perieopod, right side, with 3 aimulatious. . . . Pandalina brevirostris 



[(Rathke) 



EXPLANATION OF PLATES I.-IV. 



Fi'ff. 1. Pandalus Montagui, Leach. 



Fig. 2. Pandalus ijropinquus, G. 0. Sars. 



Fig. 3, Pandalus Bonnieri, Caullery. 



Fig. 4. Pandalina brevirostris (Rathke), 



Reference letters : — a. Carapace with rostrum. 6. Autennal scale, 

 c. Second maxilla, d. Third maxilliped. e. Tip of first peraeopod, 

 showing chela. /. Second peraeopod of right side. g. Last perieopod. 

 h. Endopod of lirst pleopod of male, h' . Second form of same described 

 in P. Montagui. 



Note. — To facilitate comparison, the figures of the same part in the 

 difterent species have been drawn approximately of the same size. It 

 will, of course, be understood from the dimensions recorded in the text 

 that the actual sizes may be very different. 



