86 



Proceedings of the na tional museum. 



VOL. XXVII. 



Fig. 89.— Pseudione 

 paiicisecta, first 

 lamella of mar- 



SUPIUM. X 10. 



the lateral margin of the three posterior segments, and are produced 

 laterally into irregular processes. 



The segments of the abdomen are distinct with the epimera extend- 

 ing as narrow, elongated plates on either .side of the 

 first five segments. Terminal segment knoblike in 

 appearance with well-rounded margins. 



Pleopoda consist of five pairs of double-branched, nar- 

 row, elongated tapering lamella directed backward, the 

 inner branches being smaller than the outer branches 

 in the last two segments. The uropoda are a single 

 pair of lamellae, both lamellae being irregular in outline. 

 The five pairs of incubatory plates completely inclose 

 the incubator}' pouch, meeting in the median ventral 

 line. The terminal lobe of the distal segment of the first pair is 

 not defined. All the legs have a high and narrowl}' 

 rounded expansion or carina about the middle of the 

 basis. 



The male is twice as long as broad. Head trans- 

 verse; eyes absent. Segments of thorax of equal 

 length. Abdomen short, occupying less than one-sixth 

 of the entire length and composed of 

 only five segments, all distinct, with 

 terminal segment small, rounded. 



Only one specimen was taken by the U. S. Fish 

 Commission steamer Alhat7'oss off Port Ortway, 

 Patagonia. Parasitic on Mimida curvipes Benedict. 

 TyjM.—C^Lt. No. 29096, U.S.N.M. 



UROBOPYRUS, new genus. 

 UROBOPYRUS PROCESSiE, new species. 



Body of adult female somewhat asymmetrical, and 

 a little broader than long. Color, uniformly white. 

 Head with frontal margin produced and upturned; 

 posterior margin widel}' rounded. Markings of 

 black, which may represent eyes, present on the antero-lateral angles 

 of the head. 



All the segments of the thorax are distinct. Ovarian bosses are 

 present on the anterior portion of the first four segments. The epi- 

 mera of these segments are represented by narrow plates on the outer 

 margin of the segments, lateral to the ovarian bosses. On the three 

 posterior segments the epimera are produced as large plates, larger 

 on one side than on the other, beyond the margin of the segments. 



All six segments of the abdomen distinct. The lateral margins are 

 rounded, the lateral parts not being produced. The terminal segment 

 is bi-lobed. 



Fig. 90.— Pseudione 

 paucisecta, leg 

 of sixth pair of 

 adult female. 



X20i. 



Fig. 91.— Pseudione 

 paucisecta, male. 

 X 145. 



