w, 



hile engaged in the working up of the decapod material 

 from the cruises of "Michael Sårs" I was struck by the fact the 

 glass shrimps which are so commonly caught along our coast evid- 

 ently included more species than was hitherto supposed, for at the 

 present time only two species are recognized, viz. Pasiphæa tarda 

 and Pasiphæa sivado. 



Accordingly I sought to secure as many examples as possible of 

 Pasiphæa 1 ) from Northern Waters, and through the kindness of the 

 zoologists at our various museums, — Mr. Dons of Tromsø, Mr. Nord- 

 gaard of Trondhjem, Messrs Brinkmann and Bjerkan of Bergen, 

 and Mr. Wollebæk of Kristiania, — I received all their preserved 

 material, and during a short stay at Copenhagen in July this year 

 1 had, through the kindness of Messrs Bøving and Lundbeck, 

 access to the ample collections from the very extended danish 

 expeditions in home and arctic regions. 



As a result of my investigations, I found that the fauna of 

 the Scandinavian waters included four species of Pasiphæa, viz.: 

 1. Pasiphæa multidentata Esmark (= P. tarda autorum) 

 • 2. P. principalis n. sp. (= princeps Kemp) 



3. P. tarda Kr øy er 



4. P. sivado Savigny 



to which the following is a key: — 

 I. Telson forked 



A. "Rostrum" cuneiform, ascendant, projecting 



P. multidentata Esmark 

 (Long spine on scaphocerite, 

 base of 2nd pereiopod with 7 to 12 

 spines. Size up to 11 cm.). 



*) According to Kkøyer (1845), Savigny, who created the genus, wrote the 

 name as above. Whether etymologically right or wrong, I think it should be 

 spelt as its autor spelt it. 



