During the cruise of the "Michael Sars" in the North 

 Atlantic in 1910 Pycnogonida were collected at six stations, 

 altogether about a hundred individuals belonging to nine 

 species distributed among the genera Colossendeis, Nym- 

 pho/i and Boreonymphon. Two species, one of Colossendeis 

 and the other of Nymphon were new to science. Two 

 thirds of the material in hand belong to a single species: 

 Boreonymphon robustani. 



The six stations are: 



24 lat. 35° 34' N., long. 7° 35' W. May 6-7, 1910. 



25 B lat. 35° 46' N., long. 8° 16' W. May 7—8, 1910. 

 38 lat. 26° 3' N., long. 14° 36' W. May 20, 1910. 

 41 lat. 28° 8' N, long. 13° 35' W. May 23, 1910. 

 70 lat. 42° 29' N., long. 51° 15' W. June 30, 1910. 



102 lat. 60° 57' N., long. 4° 38' W. August 10, 1910. 



Colossendeis Jarzynsky 1870. 

 Colossendeis proboscidea Sabine. 



The collection includes eight specimens of this species, 

 all females ranging in length from 37 to 55 mm. One 

 specimen had been placed in a bottle, along with a 

 specimen of Boreonymphon robustum, labelled simply Stat. 

 102, while the other specimens were found in a separate 

 bottle without label. Presumably they were all taken at 

 Stat. 102, in the trawl at a depth of 1000 metres. 



This species has a wide distribution in the Arctic 

 Ocean, and was taken by the Norwegian North Atlantic 

 Expedition in 412 fathoms to the west of Storeggen. 



Colossendeis angusta Q. O. Sars. 



Two adult females, 29-5 mm in length were taken, 

 one at Stat. 102 in the trawl at 1000 metres, and the 

 other at Stat. 70, in 1215 metres. 



Colossendeis angusta inhabits the Arctic Ocean be- 

 tween. Jalmal and Greenland, as well as the Norwegian 

 Sea and the northern part of the Atlantic Ocean. It occurs 

 along the eastern coast' of North America as far south as 

 to 38° 15' N., 73° 15' W. and as deep as 1242 fathoms 

 (Wilson). 



Colossendeis leptorhyncus Hoek. 



Three adult males were taken: one at Stat. 24 in the 

 trawl at 1615 metres, one at Stat. 25 B in the trawl at 

 2055 metres, and one at Stat. 70 in the silk net at about 

 1100 metres (1700 metres of wire out). 



The two first mentioned were each 36 mm in length, 

 the proboscis measuring 23 mm; the individual from Stat. 

 70 was larger, 42 mm in length. This species was taken 

 by the "Challenger" at several places between lat. 33° 

 and 51° south, and a variety (C. leptorhynchus, var. 

 septentrionalts Caullery) was found by the "Caudan" at 

 a depth of 1710 metres in the Bay of Biscay. The 

 "Michael Sars" specimens correspond well with Hoek's 

 description except that the proboscis is a little shorter, 

 and the capture of this species at Stat. 70 greatly extends 

 its known distribution. 



Colossendeis colossea E. B. Wilson. 



Of this species four male specimens were taken: two 

 at Stat. 24 in the trawl at 1615 metres, and two at Stat. 25 

 B in the trawl at 2055 metres, besides these also a pro- 

 boscis, 31 mm in length, from Stat. 70 at 1100 metres. 

 The specimens from Stat. 24 are 42 and 43 mm in length 

 respectively, and 426 mm in circumference, while those 

 from Stat. 25 B are 45 and 50 mm in length, and 453 

 and 507 mm in circumference, respectively. They all 

 correspond closely to the diagnosis given by Wilson, but 

 the proboscis is a little narrower and the accessory feet 

 somewhat shorter; thus the feet of an animal 48 mm in 

 length measure only 85 mm instead of according to Wil- 

 son about 100 mm. 



C. colossea has previously been recorded from the 

 ocean off Greenland (lat. 61° 44' N, long. 30° 29' W.), 

 and southwards along the eastern coast of America as 

 far as lat. 39° 43' N., long. 70° 53' W., at depths from 

 810 to 1300 fathoms. 



The "Michael Sars" material extends the known 

 geographical distribution to this species, and shows that 

 it varies very little. 



