53 



Occurrence. This handsome Calanoid, which is undoubtedly of true arctic 

 origin, has recently been stated by Mr. 0. Nordgaard to occur off the Norwegian 

 coast, he having found some specimens, together with other relict arctic forms, in 

 the Herlo Fjord near Bergen, at a depth of about 400 metres. I have myself found 

 it occasionally in 2 different plankton-samples taken during the cruise of the "Mi- 

 chael Sars" in 1900, the one from Stat. 9, located at some distance north of the 

 Shetland Islands, the other from Stat. 34, east of Jan Mayen, the depth being 

 recorded to be from 200 to 1000 metres. 



Distribution. Gulf of Guinea (Scott), Pacific in 35 N. Lat., 125 W. 

 Long. (Giesbrecht), Polar basin crossed by Nansen, in many places rather abundant 

 up to the very surface of the sea. 



22. Amallophora brevicornis, G. 0. Sars. 



(PI. XXXVI). 



Scolecithrix brevicornis, G. O. Sars. The Norwegian North Polar Expedition. 

 Crustacea, p. 46, PI. X. 



Specific Characters. Female. Body rather shorter and more robust in 

 form than in the preceding species, being less attenuated anteriorly, frontal part 

 obtusely rounded, and without any trace of a crest. Last segment of metasome 

 with the lateral parts angularly produced. Urosoine comparatively slender, 

 somewhat exceeding l / 3 of the length of the anterior division. Caudal rami about 

 twice as long as they are broad, apical setse less elongated than in A. magna. 

 Anterior antennae comparatively short, not nearly attaining the length of the 

 anterior division, but otherwise agreeing in structure with those in A. magna. 

 Posterior antennae likewise of a very similar appearance. Pedicellated sensory 

 appendages of anterior maxillipeds comparatively larger, and curved in different 

 directions. Natatory legs very powerfully developed, and of almost exactly the 

 same structure as in A. magna. Last pair of legs likewise rather similar, though 

 comparatively smaller, and each only composed of 2 joints. 



Male unknown. 



Colour not yet ascertained. 



Length of adult female not quite 2 mm. 



Remarks. This form, first described by the present author from Nansen's 

 Polar Expedition, was at that time erroneously referred to the genus Scolecithrix 

 of Brady. On a closer examination, I have now convinced myself that it 

 ought really to be included in the genus Amallophora of Scott, as the terminal 

 appendages of the anterior maxillipeds exhibit the peculiar structure charac- 



