84 



PROCEEDINGS OF THE NA TIONAL MUSEUM. 



VOL. XXVII. 



Locality. — Off east coa.st of Patagonia, two specimens parasitic on 

 Munida suhrugom. Collected by U. S. Fish Commission steamer 

 Albatross. 



PSEUDIONE TUBERCULATA, new species. 



Head small, with frontal border; anterior margin straight; posterior 

 portion narrowly rounded. 

 Segments of thorax distinct. Ovarian bosses present on antero- 



FlG. S3.— PSEUDIONE TUBERCULATA. a, DORSAL VIEW OF FEMALE; h, VENTRAL VIEW OF SAME. X 4. 



lateral part of first four segments. Last three segments without 

 bosses. The epimera occupy only the small posterior part of the 

 lateral margin of the first four segments, and are not distinctly sepa- 

 rated from the segments on the dorsal side; they occupy the whole of 



Fig. 84.— PSEU- 

 DIONE TUBER- 

 CULATA, MAX- 

 ILLIPED. X 5. 



Fig. 85.— Pseudione tu- 

 berculata, distal seg- 

 ment of first lamella 

 of marsupium. x 10. 



Fig. 86. — Pseudione 

 tuberculata, leg 

 of sixth pair of 



adult female. 



XlU. 



the lateral margin of the last three segments, and are in 

 the form of large plates, extending somewhat backward. 

 The segments of the abdomen are distinct. The epim- 

 era of the abdominal segments form large plates on either 

 side of the segments. They are present on all but the 

 last or terminal segment, and are not distinctly separated from the 

 segments. The epimera almost entirely conceal, on the dorsal side, 

 the underlying pleopoda. The terminal segment is bilobate posteri- 



FiG. 87.— Pseu- 

 dione TUBER- 

 CULATA, MALE. 



X8. 



