BIHAXG TILL K. SV. VET.-AKAP. IIANDL. BAND 27. AFD. IV. N;0 8. 49 



tailed descriptions, accompanied with figures, of the transitional 

 forms between both species, as such would have proved of very 

 great interest. 



As to my own opinion. I can not, at any råte at present 

 think that Doflein is right in this view. I have examined 

 and com])ared a not inconsiderable number of both species, 

 but I was not able to observe any intermediate forms. On 

 the contrary, both forms seemed. in my collection, to be so very 

 distinct, that I was able at the very first glance, to separate 

 them. In nearly all speeimens of Hippolyte spinus the rostrum 

 had the typical form as figured bj^ Kröyer in tab. II, fig. 

 45, 1. c. whereas hardly any one specimen of H. turgida 

 deviated in the form of rostrum from fig. 57 on the same 

 plate, or from fig. (M on pl. III. As most of them were fe- 

 males carrying roe, the prevailing form of rostrum was that 

 figured in fig. 57 by Kröyer as typical for his Hippolyie tur- 

 (jida. Besides that. it is very easy to distinguish both species 

 (at least, the females) on the more robust form of the hoÅy 

 and its smaller size in Hippolyte turgida than in H. spinus. 

 The spines on the dorsal carina are also, in this species, much 

 stronger and larger than in //. turgida. However, it is pos- 

 sible they may be united under one species, and it is for 

 this reason that further details on transitional forms would 

 be very welcome. 



Hiptpohjtf spinus has a very extensive distribution within 

 the Arctic region. It is obtained off the coasts of the follow- 

 ing countries: West Greenland as far north as Cape York 

 and Ingelfield Gulf, Clrinnel Land, Baffin Land, Labrador, 

 Nova Scotia, New England as far south as Massachusetts 

 Bay, where ni is by far the most abundant species of the 

 genus) (Smith, 1. c. p. Q9), Alaska, Behring Strait, Kam- 

 tschatka, Nova Zembla, Kola Peninsula, Finmarken, Beeren 

 Island, Spitzbergen, East Grreenland. But here it seems to 

 be rather rare, as it occurred only at two stations during 

 the last Swedish Expeditions. Although it is very probable 

 that it has a circumpolar range, it is, however, worth remark- 

 ing that it has not as yet been found in the shallow sea 

 along the Siberian coast from Nova Zembla in the west to 

 Bering Sea in the east. 



If Hippolyte Lilljeborgi is identical it goes farther south 

 along the West Coast of Norway and Scotland. It lives 



4 



