80 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



PSEUDIONE CURTATA, new species. 



Head very large, with wide anterior nmrgin, almost straight; no 

 frontal border. Antero-lateral portion produced in a small process 

 on either side. Posterior portion widely rounded. Eyes wanting. 



Fig. 73.— PSEUDIONE CUR- 

 TATA, FIRST LAMELLA OF 

 MARSUPIITM. X 14^. 



Fig. 72.— PSEUDIONE CURTATA. a, dorsal view of FE.MALE; b, ventral view of SAME. x8. 



The segments of the thorax are distinct. The cpimera are distinct 

 as narrow plates on the extreme lateral margin of the anterior portion 

 of the first four segments. Ovarian bosses are 

 prominent on the anterior portion of the first four 

 segments. The epimera occupy almost all of the 

 lateral margin of the three posterior segments. 

 The abdomen has the six segments distinct. 

 All are produced laterally in small rounded 

 epimera with the exception of the last; or termi- 

 nal segment which is very small and rounded 

 posteriorly. 



The pleopoda are five pairs of large, broad, 

 smooth, leaf-like, double-branched appendages 

 not concealed on the dorsal side b}^ the small epimeral plates of the 

 abdominal segments, from which they project in full view.' The uro- 

 poda are a pair of single-branched, simple append- 

 ages, similar in shape to the branches of the pleopoda. 

 The marsupium is formed of five pairs of incu- 

 batory lamellae, which overlap so as to completely 

 encompass the ventral surface of the body; the first 

 pair have the terminal lobe of the distal segment 

 small, but well defined. 



There are seven pairs of small legs, all similar 

 in size and structure; a high triangularly shaped 

 expansion or carina is present on the basis. 

 Color uniformly light j^ellow. 



Male, two and one-third times longer than broad, with all seven 

 segments of the thorax and all six segments of the abdomen distinct 



Fig. 74.— PSEUDIONE 



CURTATA, LEG OF 

 SIXTH PAIR OF ADULT 

 FEMALE. X 39. 



