REPORT ON THE PYCNOGONIDA. 



89 



Phoxichilidium oscitans, n. sp. (PI. XIII. figs. 1-5). 



Diagnosis. — Body robust, lateral processes not very widely separated. Mandibles 

 three-jointed, with long and slender pincers. Ovigerous legs ten-jointed, without claws, 

 probalily present in both sexes. Auxiliary claws present. Palpi represented by rounded 

 protuberances. Proboscis swollen in the middle, and considerably at the tip. 



Description. — 



A single specimen of this beautiful species was brought home by the Challenger. It 

 is a species with a robust body, with long lateral processes, which are not widely 

 separated, a very long abdomen, and a very stout proboscis. The first or cephalic part 

 of the cephalothoracic segment is almost globular, and bears about its middle a blunt 

 oculiferous tubercle with two rudimentary eyes, represented by brown spots, which are 

 connected by a slender strip of pigment, the whole not unlike the form of what the 

 French call a pince-nez. The cephalothoracic segment is nearly as long as the three 

 other segments together. The abdomen is long, cylindrical, swollen at the extremity. 



The proboscis is very stout ; it is considerably swoUen in the middle, and also at the 

 extremity. This extremity is flattened at the front, and has a very large triangular 

 mouth, the three lips of which are turned inwards. While the body is almost everywhere 

 smooth, the front of the proboscis bears round the mouth not very long but compai'atively 

 strong hairs. 



The mandibles are distinctly three-jointed. The first joint is the longest ; the second 

 is but little shorter ; together they reach considerably beyond the end of the proboscis. 

 The third joint is small, and bears a pair of extremely slender pincers, the movable one 

 being much more strongly curved than the immovable one. At the end of the first 

 joint a row of not very long but comparatively strong hairs is observed ; those at the 

 extremity and over the whole surface of the third joint are a little longer. The pincers 

 are quite smooth. 



The palpi are represented by very large globular pi'otuberances, placed at both sides, 

 near the base of the proboscis. 



The ovigerous legs are inserted ventrally not far from each other. Seen from the 

 ventral side, the cephalothoracic segment is much shorter than when observed dorsally ; 

 nor is there from that side any trace of a division into two joints to be seen, as is the 

 case in Phoxichilidium mollissimum, Hoek. 



The length of the joints of the ovigerous legs is exactly as in Phoxichilidium 



(ZOOL. CHALL. EXP. — PART X. — 1881) K 12 



