94 G. 0. SARS. CRUSTACEA. [NORW. POL. EXP. 



Occurrence. This remarkable Calanoid was found in 7 different samples 

 taken on the following dates: March 22nd, 1894, March 24th, 1894, April llth, 



1894, May 22nd, 1894, between March 26th and April 4th, 1895, May 7th, 



1895, and November 12th, 1895, the tow-net having been lowered to depths 

 of from 100 to 300 metres. One of the samples was taken near the most 

 northerly point reached by the 'Fram'. 



Gen. Hemicalanus, Glaus. 



Remarks. The generic name Hemicalanus was originally proposed by 

 Dana in the year 1852; but as all the species included by him in that genus 

 have proved to be referable to two previously established genera, viz., Calanus 

 and Centropages, this name ought more properly to have been wholly dis- 

 carded. Prof. Glaus, however, in the year 1863, employed the same name in a 

 different sense, to comprise 5 Mediterranean species, 2 of which were subse- 

 quently removed by Dr. Giesbrecht, and referred to the nearly-allied genus 

 Augaptilus. To the 3 remaining species of Glaus, now generally admitted to be 

 genuine Hemicalani, 2 species were added by Brady from the Challenger Expe- 

 dition, and Dr. Giesbrecht records 6 new species, 4 of which were found in the 

 Gulf of Naples, the other 2 in the tropical part of the Pacific. None of these 11 

 species have ever been found north of the Mediterranean, and it has accor- 

 dingly been generally assumed that the present genus is quite southern 

 in distribution. It was therefore not a little surprising to find a specimen, 

 undoubtedly belonging to this genus, in a sample taken from about the centre 

 of the polar basin traversed by the 'Fram'. The specimen was in a suffi- 

 ciently good state of preservation to allow of a close examination, both as 

 to the external appearance and the anatomical details, and, as it may be of 

 considerable interest to determine the relation in which this form stands to the 

 other known species, I have given on PI. XXVIII, figures, as exact as possible, 

 both of the whole animal and the chief appendages. Not having been able 

 to identify it with any of the previously known forms, I describe it here provi- 

 sionally as a new species. 



