ISOPODS OF NORTH AMERICA. 



561 



FIG. 615. PROBOPYRUS LATREU- 

 TICOLA. FIRST INCUBATORY 

 LAMELLA. X 51}. 



parts large and expanded. On the shorter side they are less expanded 

 and upcurv r ed, showing the legs. Ovarian bosses are not present on 

 any of the segments. The lateral margins of all the segments of the 

 expanded side are entire with the exception of the -second, which has 

 a decided notch separating the anterior two- 

 thirds from the posterior third. The epimera 

 seem to be perfectly coalesced in all the seg- 

 ments with the dorsal part of the segments. 

 The segments of the abdomen are all fused 

 in the middle of the dorsal surface. On the 

 shorter side of the body there is no indication 

 of the segments, the lateral margin being 

 straight and continuous. On the opposite 

 side, however, five distinct segments are 

 marked off from the terminal lobe by five 

 deep notches. There are five pairs of double-branched pleopoda in 

 the form of small, rounded lamellae. No uropoda are developed. 

 The five pairs of incubatory lamellse do not completely inclose the 

 marsupial pouch. The plates are small and bound only the lateral 

 parts of the marsupium. The distal segment of the first pair is pos- 

 teriorly rounded. There are seven pairs of legs, all equally well 



developed and having pre- 

 hensile hands. 



The male is oblong-ovate. 

 The anterior margin of the 

 head is widely rounded. 

 Eyes are distinct. The 

 seven segments of the 

 thorax are distinct and 

 have the lateral margins 

 rounded. The segments of 

 the abdomen are fused in 

 the middle, but are all dis- 

 tinctly marked at the sides. 

 Five deep notches separate 

 the first five segments from 

 each other and from the 

 sixth or terminal segment, which has the posterior margin produced 

 in three small lobes, one median and one on either side, all in a trans- 

 verse line. There are no uropoda nor pleopoda. The abdomen is not 

 abruptly narrower than the thorax. 



The specimen described is found parasitic on Latreutes tnsiferus 

 (Milne Edwards). 

 2858905 36 



FIG. 616. PROBOPYRUS LATREUTICOLA. a, FIRST PLEOPOD 

 (SHOWING BOTH BRANCHES), x 54|. ft, SECOND PLEOPOD. 

 x 103}. c, THIRD PLEOPOD. x 103J. d, FOURTH PLEO- 

 POD. x 103}. 





LIBRA 



R V 



