08TRA<'<H>\. 



<>f the adult. Hut one or two sitiull -pe. miens which occurred along with P. 



and which I at first took to be the young of that species, were very 



-tiiicily :ui'_'iilat-il |xistriorly, and 1 now think that they belong probably to the 



t"l!\ving species /'. <w#/ii7/. f especially as they have not the villous covering of 



P. 



I'lll l.i MK.I'l-:> A- 



(Plate I., figs. 16-21. Plate II., figs. 1-6.) 



Shell of the/, male seen from the side (Plate II., fig. 1) oblong, subcircular, height 

 |ii.-il to two-thirds of the length, anterior extremity sharply angulated lelow at its 

 inn. lion witli flu- wide truncated rostrum, posterior sloping steeply and forming a some- 

 what rounded, prominent angle at its ventral end ; dorsal margin strongly arched, 

 lii-Jie-t in the middle, ventral evenly but less strongly convex, terminating in front in 

 a deep subn>stral sinus and behind in an obtusely angular process. Seen from above 

 (fig. ~2) the outline is oblong, ovate, twice as long as broad, greatest width situated 

 in the middle, anterior extremity obtusely pointed, posterior produced and mucronate, 

 lateral margins evenly arcuate. The shell of the male (fig. 3) much longer in 

 projx.itioii to the height, rostrum and subrostral sinus much less pronounced, 

 posterior extremity more narrowed and having a larger and more rounded ventral 

 prominence ; the squamous, marginal lamina' of the rostrum are marked with numerous 

 li'iir-like striaj and are closely punctated (fig. 4). The limbs and appendages do 

 not present any special specific characters, but the hairs at the base of the claws 

 of the post-abdomen of the male are more than usually conspicuous (fig. 5). 

 Length of the female, 1 8mm. 



The stations at which P. axsimilis was taken were all in Winter Quarters: 



September 30, 1903. No. 12 hole, D. net 240. 



Hut Point. September 1::. r.",;.', D. net. 



Hut Point. February 18, 1904, I), net i'C.4. 



10 Fathoms, March 19, 1902. 



November 28, 1902, D. n< t. 



May 28, 1902, and February 13, 1904. 



12 Hole, D. net, September , 1908. 



1'HILOMEDES ANTARCTICA. 



(Plate III., figs. 1-10.) 



Shell of the ff malt seen from the side, broadly subovate (fig. 2), with a prominent 

 beak, a deep subroetral sinus, and an obtusely prominent postero-ventral angle, greatest 

 height situated in the middle, and equal to about two-thinls of the length ; anterior 

 extremity rather narrower than the posterior, sloping steeply from the dorsum to form 

 the angularly prominent l>eak ; posterior subtruncate, slightly sinuated, rounded off 

 dorsally, but terminated ventrally by a rounded, backwardly produced prominence ; 



