PYCNOGONIDA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 151 



Oviger ten-jointed ; denticulate spines not numerous, with six (?) lateral teeth. 

 Legs : principal joints subequal, tarsus and propodus subequal, terminal claw with two 

 well-developed auxiliaries. 



Body stout, with lateral processes long the second pair longer than the width of 

 the body, and rather widely separated. 



Cephalon not long, constricted to form a well-defined neck, and then expanded to 

 form the stout cephalic lobes. 



Ocular tubercle rises between the first pair of lateral processes, abreast of their 

 anterior border. It is tall, tapering, and ends in a blunt point where the four eyes 

 occur. 



The segmentation of the trunk is distinct but not very prominent, and the abdomen 

 is not separated by an articulation. This part of the body is rather long and slightly 

 pyriform. It carries a few very small setse, which also occur as distal fringes of the 

 lateral processes. 



The length of body is 3 mm., of the trunk only, 2'25 mm. ; its width is 1'8 mm. 



The Proboscis is almost cylindrical, with a truncated extremity, and its base is 

 reduced a little in diameter. Measured ventrally, it is 1 '4 mm. long. 



The Chelifori are well developed. The scape is long, 1'3 mm., sparsely covered with 

 setse. The chela is strong, the palm being setose ; the fingers are scarcely as long, 

 much curved, and beset with numerous closely set teeth of variable length. 



The Palp arises at the side of the proboscis, and comprises the normal five joints ; the 

 first is very small and stout; the second is the longest, and its proportionate length with 

 the remainder is 4, 2'5, 1'5, 175. The second joint is sparsely covered with rather 

 long setae ; on the following joint they are much more numerous, and on the two 

 terminals they are more thickly distributed, and chiefly on the ventral surface. 



The Oviger arises ventrally between the first pair of lateral processes. The first 

 three joints are very small, the first two being stout and having a very oblique joint 

 between them ; the third has the normal oblique joint ; the fourth and fifth are sub- 

 equal in length, the former being much the stouter, the sixth being a little more than 

 half their length. Very few small setse are to be found on this part of the appendage ; 

 they are, however, rather more numerous on the sixth joint. The four terminal joints 

 are very nearly subequal, setose dorsally, and each has a row of a few denticulate spines, 

 6, 6, 5, 7. The terminal claw is rather long, with about nine teeth not very closely set 

 These and the denticulate spines are rather worn. The spines are curved forwards, 

 probably due to pressure. There are four well-developed teeth on each side, and 

 probably two more delicate ones. 



The Legs attain a length of about 9 mm. Of the three coxae, the second is the 

 longest, but scarcely as long as the other two together ; the proportions of the other 

 joints are 4, 4, 4, 2, 2. The terminal claw is about half the length of the propodus, and 

 has two well-developed auxiliaries. The entire limb is covered with rather fine setae ; 



(ROT. SOC. EDIN. TRANS., VOL. XLVI., 171.) 



