PYCNOGONIDAE 



127 



Proboscis a little shorter than cephalic segment, bluntly conical. 



Abdomen somewhat clavate, reaching to distal end of second coxa of fourth leg. 



Oviger short, with nine small segments and a terminal claw. The left oviger has been 

 entirely suppressed and there is no trace of the small process to which it ought to be 

 attached. 



First coxae at least twice as wide as long, the anterior distal angle of each is drawn 

 out into a triangular lobe. 



Third leg as represented in Fig. 72 a and at least half as long again as the trunk. 



Female. The transverse body ridges and the anterior rim of the cephalon are more 

 pronounced than in the male. There are two small pointed tubercles a short distance 

 behind the ocular tubercle — these are much smaller in the male. The ovigers are, of 

 course, wanting, and there is a low, round tubercle dorsally on the second coxa of the 

 last leg. 



The genital openings are apparently not yet present in the female, but they are quite 

 distinct in the male. 



Measurements {mm) 



Remarks. The specimens from St. 399 differ from those just described in the 

 following respects, (i) The trunk is narrower, with lower transverse body ridges and 

 lower median tubercles. (2) The third leg is subequal to, instead of approximately 

 half as long again as the trunk length. (3) The abdomen also is shorter, although it 

 again reaches to the distal end of the second coxa (see ratios above). (4) The lateral 

 processes are separated by narrow intervals. The genital openings are quite distinct in 

 each specimen. 



The Discovery specimens are referred provisionally to P. magellanicum, although they 

 do not agree with each other or with the holotype. Hoek's figure (1898, pi. iii, fig. 20) 

 does not show the transverse body ridges nor the low median tubercles of the holotype, 

 which in this respect agrees with the specimens from St. 399. In other respects the 



