462 Mr. T. V. Hodgson on a new Pycnogonid. 



Willi regard to the ambulatory appendages, all the five 

 are practically of the same size and proportions, while the 

 character and arrangement of the set^ are identical. 



Of the three coxse the first and third are subequal in 

 length, the third being, if anything, slightly the longer. 

 The second coxa is slightly longer than the otiier two 

 together, and all of them bear minute setai. 



The femur is a comparatively stout joint, slightly curved, 

 sparingly supplied with short setas and a icw very long ones. 

 One or two of the latter occur along the shaft and a few at 

 the distal extremity. The first tibia is slightly longer than 

 the femur, setose along its entire length ; small setae are 

 most numerous, and the longer ones are scattered irregularly 

 among them. The second tibia is considerably the longest 

 joint of the entire appendage and setose, like the preceding 

 joints, along its proximal half; then the seta^ become delicate 

 spines rather than true setse and are arranged in four distinct 

 rows. The lateral rows are, of course, the most prominent, 

 and the setae on the inner side of the joint are most numerous 

 and regular. Some half- dozen spines fringe the distal inner 

 margin. 



Of the two remaining joints, the tarsus and the propos, 

 the former is the longer, but in other respects they are 

 alike. Both bear four rows of setse, those on the inner 

 margin being regular and by far the most numerous, besides 

 having the nature of spines rather than true setge. The 

 terminal claw is long and provided with two auxiliaries of 

 about a quarter the size. 



Altogether 28 specimens of this interesting species were 

 taken, but many of them are in a more or less mutilated 

 condition. Five of them are females whose limbs are dis- 

 tended with ova. Two males are carrying eggs, and those 

 on another are just hatched. The egg-masses are ovoid in 

 shape and somewhat irregular ; this is possibly owing to the 

 freezing they underwent between the surface of the ice and 

 the collecting-pots. The eg,e,s are very small and numerous. 

 I understand that Mr. W. S. Bruce, of the Scottish 

 Antarctic Expedition, has taken several specimens of a 

 ten-legged Pycnogonid from the Weddell Sea, which may 

 prove to be identical with this species. 



I am indebted to the Council of the Marine Biological 

 Association for accommodation at their Plymouth Laboratory, 

 and to my friend Mrs. L. E. Sexton for the drawings. 



EXPLANATION OF PLATE XIV. 



Pe»ta>}i/?))2)hon antarrtimm, female, enlarged .«ix times. 



