1912] 



The Glass Shrimps (Pasiphæa) in Northern Waters. 



specimen, which Saks describes very drastically (1865) agrees per- 

 fectly with the condition of the specimen examined by me, so there 

 can be little doubt that Esmaek actually had before him a speci- 

 men of '"the common glass prawn". as it may be called by way of 

 distinction from P. tar da and P. principalis, which have only been 

 caught on a few occasions in our waters. 



As may be seen from the chart fig. 1 P. multidentata has been 

 tåken on the coast of the United States, south of the Færøes, on 



Fig. l. 



Tampen bank in the North Sea, in the Skagerack, and in the Nor- 

 wegian fjords up to Malangen (near Tromsø). 



The specific identity of the specimens from America is beyond 

 doubt, as evidenced by Smiths figures (pl. X, fig. 1, Smith 1879). 



From the data regarding vertical distribution it seems that 

 P. multidentata lives nearer towards the sur face than the two 

 other species. This may be connected with the fact that it is al- 

 most devoid of pigment while P. principalis, according to Kemp 

 (1910), is "of a vermilion red", and the specimens of P. tar da col- 

 lected by the "Michael Sårs" in the Skagerack in 1910 ; were thus 



referred to by dr. Hjort in the ship's journal: — " several 



giant Pasiphae of a blood-red colour." 



