603 



Öfverslgt af Kongl. Vetenskaps-Akademiens Förhandlingar 1896. N:o 8. 'j^ij 

 Stockholm. 



Notes on some rare Cephalopods. 

 By Einar Lönnberg. 



[Communicated 1896, Oct. 14, by Hj. Théel.] 



Duriiig a period of several years the zoological Museum of 

 Upsala bas had the opportunity to receive from the late Captain 

 C. EcKMAN fine collections of animals, among which from time 

 to time were several rare Cephalopods. In this paper I will 

 only refer to a few of those brought back from his last voyages 

 across the Atlantic. They are all pelagic forms and (Egopsids, 

 one of them being a new species of the genus Mastig oteuthis. 



Tracheloteuthis riisei Steenstrüp. 



lat. 52° N., long. 44° W. 

 » 36° N., ^ 51° W. 



» 33° N., » 28° W. 



» 32°,30 N., » 31° W. 



This species seems to be a rather common pelagic Cephalo- 

 pod in the North Atlantic. It occurs too in the Mediterranean.V) 

 In young specimens the fins are comparatively shorter than in 

 the old ones, and hardly more than \ of the length of the mantle, 



^) The specimen from Messina described by E. Weiss in Quart. Journ. Micr. 

 Se. Vol. 29 London 1889 p. 85 under the name Tracheloteuthis behnii 

 Steenstrup seems to belong to this species as the fins extend along one 

 third, 01 a little more of the length of the pallium, and the ventral arms 

 are % of the lateral arms. 



