kongl. sv. vet. akademiens handlingar, band. 21. n:o 5. 



17 



The body is depressed not carinated. The head is twice as deep as long, flattened above, 

 with a small rounded projection on each side. The first pair of antennce are shorter than 

 half the length of the body. The first two pairs of pereiopoda with elongated carpi. The 

 fifth pair are much longer than the sixth; the femur is strongly serrated along the anterior 

 and posterior margins, much shorter than the three following joints together; the spine-like 

 apical process is curved, much longer than the genu; the tibia is a little shorter than the 

 carpus; the carpus is only a little longer than the metacarpus. The seventh pair are shorter 

 than a third of the fifth pair. The last two ural segments are coalesced. The vropoda are 

 verv broad, finely serrated; the interiör margins of the first pair are spiniferous. The exteriör 

 rami of all the pairs are very minute, the interiör rami are longer than the peduncles. The 

 first pair of uropoda are longer than the following. The ielson is verv small, triangulär, pointed. 



Colour. Hyaline. 



Length. 5,5 mm. 



Hab. The Lofoten Islands, west coast of Norway. 



T;/i'o horealis, fi. O. Saks. 

 Facsimile fi'nm G. O. Saks. Overs. of Norges Crii.«t., jil. 3, fig. 1. 



Syn. 1882. Clydonia horrnlis, G. O. SAES. — »Oversigt af Norges Crustacéer», etc. 



Christiania Vidensk. Selsk. Forhandl. 

 1882. N:o 18, p. 77; pl. .3, lig. 1, 

 1 a and 1 b. 

 Tyrn » » C. Bovai.i.ius. 1887. »Arctic and Antarctie Hyperids». Vega- 



Esp. Vetensk. Iakttagelser. Bd. 4, 

 p. 551. 



This species seem.s to be intermediate between Ty ro Sarsi and Ti/ro Claiisi but is 

 easily di.stinguished from the first by the short antennas by the strongly serrated anterior 

 margin of the fifth pair of pereiopoda, and by the spiniferous interiör margin of the 

 first pair of uropoda. From Ti/ro Clausi it differs by the length of the fifth pair of 

 pereiopoda and of the first pair of uropoda, and by the minute extei'ior ramus of the last 

 pair of uropoda. 



The body has a very thin tegument. 



K. Vet. Akail. Ilanill. Band. 21. .\:r) r,. '^ 



