PA L.E< )T ROPUS LOV E X I . 



171 



genital components, the presence of two genital pores, as in P. Josephines, 

 Fig. 247 {P. Loveni has three, Fig. 246). The outline of the test of P. 

 Loveni and of P. Josephines is very different ; in the former the anterior 

 part is narrow while the posterior extremity is wide, the reverse being the 

 case in P. Josephines, Fig. 'J40, but as P. Josephines is only known from 

 young specimens this difference may be clue to age. The shape of the 

 episternal plates is very different in the two species ; in P. Loveni the fourth 

 pair is triangular, Fig. 250, 

 the point turned anteriorly, 

 while in P. Josephines their 

 position is reversed and they 

 reach the anal system, Fig. 

 251. 



Fig. 249. P. Josephin.e. 



After Loven. 



15 Wis 

 23 mm. 



Fig. 250. Pal.eotropus Loveni. 



Fig. 251. P. Josepiiin.£ 



After Loven. 



The species of Palasotropus described by Koehler 1 differs strikingly from 

 the other species of the genus. The sternum differs radically from that of 

 the other species ; the genital plates are distinct, and the arrangement of the 

 apical plates does not resemble that of either P. Josephine? or P. Loveni. 

 The small number and proportionally great size of the primary tubercles 

 give P. Hirondellei a very striking appearance. 



"Challenger" Expedition Station 201, January 25, 1875. Lat. 9° 26' N. ; 

 Long. 123° 45' E. ; 375 fathoms. Bottom temperature, 12°. 2. Mud. 



1 Koehler, loc. cit. PI. V, figs. 12-14. 



