NO. 1350. NATURAL 11 J STORY OF THE ISOPODA— RICHARDSON. 85 



orly, with a small median point. The posterior edge of the ventral 

 side of uU the abdominal segments is strongly keeled. The pleopoda 

 are five pairs of double-])ranched, broad, leaf-like appendag(\s, dis- 

 tinctly tuberculate. The inner branches of the first pair overlap in 

 the median ventral line. 



The marsupium is composed of five pairs of strongly tuberculate 

 lamella^, overlapping in the median ventral line of the thoiax, and 

 entirely inclosing the incubatory pouch. 



There are seven pairs of legs similar in shape and structure. A 

 wide expansion extends the entire length of the basis. 



Color, uniformly light yellow. 



Males, three and a half times longer than broad, with all seven segments 

 of thorax and all six of abdomen distinct. Ej'es wanting. A))domen 

 occupies more than one-third of the entire length of the bod3^ 



About thirteen specimens were obtained by the U. S. Fish Commis- 

 sion steamer AJhati'oss^ from off Port Ortway, Patagonia, at a depth 

 of 1,050 fathoms. Parasitic on Lithodes dimnedece Benedict. 



Type.-C^t. No. 29092, U.S.N.M. 



PSEUDIONE PAUCISECTA, new species 



Body of female ovate, twice as long as wide, twisted somewhat to 

 one side. Color, uniformly light yellow. 



Head very large, triangular in shape, with frontal margin widely 



Fig. 88.— Pseudione i'.\ucisecta. a, dorsal view of female; b, ventral view of same, x 8. 



rounded or arcuate. A wide frontal border, somewhat irregular in 

 outline, surrounds the anterior portion. Eyes absent. First pair of 

 antenna' consist of three joints; second pair of five joints. 



Ovarian bosses present on the anterior portion of the first four tho- 

 racic segments; lateral to these, on the anterior portion of the seg- 

 ments, are the wide epinuM-al plates, which have a tendency to be 

 irregular along the lateral margin. The epimera occupy the whole of 



