M 



PROCEEDINGS OF THE \ ITIONAL UUSEl M . 



VOL. -S. 



ORBIMORPHUS CONSTRICTUS, new species. 



Body of adult female ovale, somewhat irregular in outline. 

 Head large, and with a narrow frontal border. Eyes absent. 

 First pairof antenna' small, composed of three articles, the terminal one 

 being minute. Second pair of antennae concealed bythe mouth parts. 

 The seven segments of the thorax are distinct. Lateral bosses are 

 present on the first four. Lateral to these are the epimeral plates, 

 which extend the entire length of the lateral margin, and which are 



larger on one side of 

 the body than on the 

 other. The epimera of 

 the last three segments 

 are also well developed. 

 The abdomen is com- 

 posed of five segments, 

 the fifth or terminal 

 segment being small and 

 not provided with pleu- 

 ral plates as are the first 

 four segments. The seg- 

 ments of the abdomen 

 are rather indistinctly 

 denned in the middle 

 of the dorsal region. 

 There are four pairs of 

 double -branched pleo- 

 pods, the lamella} being 

 leaf-like. The uropods 

 are a pair of double- 

 branched oval lamella', 

 a little shorter than 

 thebranches of thepleo- 

 pods, all of which en- 

 circle the abdomen, and 



ORBIMORPHUS CONSTRICTUS. d, ADULT FEMA LI ■ L4J. pi'0 J CC t I >C VOlld t lie pUHl- 



X 23- ' eyentb "■■'" ral plates of the abdom- 

 inal segments. There 

 areseven pairs of prehensle legs, all furnished with a high rounded 

 carina oe the basis. There are five pairs of incubatory plates, the 

 firsl pair having the distal half produced in a small lobe. 



The male is narrowly elongate. The head is large, transversely 

 oval. Eyes are -mall and distinct. All seven segments of the 

 thorax are disl met ly defined, wit h lateral margins not contiguous, but 

 separated by a small indentation. Thesegmentsof the abdomen are all 

 united to form a single tapering segment, with posterior extremity 



''. FIB I I wn.l.l.A OF M \i:m I'M If. 

 > EM < II. ./. U Mi. X 41. 



