﻿56 



PYCNOGONIDA. 



The trunk ratlier slender, the posterior edge of the rings produced into a pointed tooth. 



The neck ratlier short. 



The proboscis thick, distinctly constricted. 



The oculiferous tubercle large, the ape.x produced into an angle, the .side-teeth .sharp. 



The caudal segment slender, perpendicidarh- erect. 



The chelifori .short; the fingers mostly rudimentary, sometimes long, .slender. 



The palps somewhat long. Sensor>- distinct. 



The ovigerous legs somewhat long; the dermal leaves of the terminal part with 6 strong teeth at 



the base. 

 The ambulatory legs somewhat short, rough, densely hairy, the first tarsal joint three times .shorter 



than the second one, the comb of the second joint less small-toothed, only the fourth joint of 



the three hindmost pairs of legs with a tubercle. 

 Total length (with the jjroboscis produced) lo""". The proboscis 4""". The trunk 5""". The caudal 



segment 1,6'"'". 



This species is very much \\ke Ascor/iyt/c/ms ahyssi oi Sars «Pycnogonidea, 1891, p. 133, pl.XIV, 

 fig. 2, 2 a-t, and I was long doubtful whether I should set it up as a particular species. Among the 

 characters of the diagnosis I may especialh' point to the shape of the oculiferous tubercle, ha\-ing 

 always found its dorsal side produced in the middle to an acute angle with sharp teeth on the sides. 

 The neck is also much shorter, the point of the rings of the trunk is drawn back quite to the 

 posterior edge, the caudal segment is horizontal, not directed downward, and the armament of the 

 inner edge of the second tarsal joint is much more spread than in Ascorhynchus abyssi. I ha\e also 

 pointed out that the sensory in the palps is distinctly discernible, and that only the three hindmost 

 pairs of ambulatory legs have the tubercle on the fourth joint, already represented by Sars; but it is 

 possible or probable that these two characters may be found also in Ascorhynchus abyssi. Finallj' 

 the ratio of length between the joints of the palps is not a little different from that in the species 

 of Sars. The differing structure of the chela and its fingers is scarcely to be regarded as a specific 

 character. 



Occurrence. The Ingolf-stations 112, 113 and 124 are in the western part of the Norwegian 

 Sea and in the southeastern part of the Greenland Sea. The two first places, on which it was taken 

 in considerable number.s, were on 67° 57' Lat. N. 6° 44' Long. W., and 69°3i'Lat. N. 7' 06' Long. W. , the 

 depths were 1267 and 1309 fath. , and the bottom was on both places Biloculina cla}- with tempe- 

 ratures of -^ I'^'i and -=- i'. On the third place, 67° 40' Lat. N. 15' 40' Long. W. the depth was only 

 495 fath., the bottom brownish gray, or blue mud or cla\- (not Biloculina clay) with short, cylindrical, 

 araneous foraminifera, and with a temperature of -=- 0,6''. 



III. Fam. Colossendeidae. 



Corpus solidum. 



Rostrum wilidum, inflexibile, libratum vel nutans. 



