PYCNOGONIDA DREDGED DURING THE CRUISE OF H.M.S "TRITON. 7 



Four robust specimens were taken at Station No. 10 at a depth of 516 

 fathoms. It is the only representative of the genus found at a considerable depth 

 in high northern latitudes. Professor Sars collected it between N. lat. 72° 

 27' and 80°; the station at which the "Triton" dredged it is N. lat. 59° 39' 30", 

 in the warm area. 



11. Pallenopsis tritonis, n. sp. 



(Plate I. figs. 1-6.) 



Animal slender, the lateral processes, at the end of which the legs are 

 inserted, being distinctly separated from each other. Dark yellow coloured, 

 smooth : no tubercles or hairs are visible on the surface of the body even when 

 studied with a lens. Legs not very hairy ; the structure of the hairs, as in 

 numerous species of Pallene and Pallenopsis, furnished with small barbs 

 pointing towards the tip. 



Proboscis nearly cylindrical, slightly swollen a little behind the middle. 

 Mouth large, as in the other species of the genus {Pallenopsis oscitans, Hoek, 

 spec. &c). The length of the proboscis is not quite equal to that of the 

 oculiferous and two succeeding segments taken together. 



Oculiferous segment longer than the two following taken together, somewhat 

 swollen in front, where it overhangs the base of the proboscis, and where it is 

 furnished with the rounded oculiferous tubercle. Of the eyes the two anterior 

 ones have very large clear lenses ; the other two are a great deal smaller and 

 are placed at the back side of the tubercle, a dark reddish and rhombiform 

 pigment spot being placed at the tip of the tubercle. 



The form of the other segments is the same as in other species of the 

 genus : the abdomen is cylindrical, its length corresponds with that of the 

 second and third segments taken together (fig. 1). 



The mandibles are very slender, the two basal joints extend beyond the 

 tip of the rostrum, third joint considerably swollen, with the claws curved and 

 not so long as in P. longirostris, Wilson (fig. 2). 



The palpi are represented by very small globular knobs implanted laterally 

 near the base of the proboscis. 



The ovigerous legs (figs. 3 and 4) have the first joint almost globular, the 

 second, fourth, and fifth joints of considerable and nearly equal length, the 

 third a great deal longer than the first, and also a little longer than the sixth 

 joint, which is swollen at the distal extremity. Seventh to tenth joints gradually 

 diminishing in length, and at the same time growing more slender. Tenth joint 

 rather elongate. Joints first to fifth are sparsely hairy, joints sixth to tenth 

 covered with numerous spines; those at the distal extremity of the sixth joint 

 are a great deal stouter, and are placed in a complete ring. 



The legs are exactly thrice as long as the body (with the proboscis enclosed) ; 



