ISOPOD3 OF NORTH AMERICA. 

 PSEUDIONE FURCATA Richardson. 



529 



Pseudione furcata KICHARDSON, Proc. U. S. Nat. Mus., XXVII, 1904, p. 79. 



Locality. Eastern shore of Virginia. 

 Body of female longer than broad, more or less ovate. 

 Head with frontal border; anterior margin nearly straight; posterior 

 portion narrowly rounded. Head small and deeply immersed in thorax. 



FIG. 571. PSEUDIONE FURCATA. a, DORSAL VIEW OF FEMALE. 6, VENTRAL VIEW OF SAME, x 4. 



Mouth parts and antennae concealed by first lamellaa of marsupium. 

 The first antennae are composed of three, the second of four joints. 



The thorax has all the segments distinct. Ovarian bosses are large 

 and prominent on the first four segments. The epimera on these seg- 

 ments are represented by narrow ridges lateral to the ovarian bosses; 

 those of the three last segments occupy all of the lateral margin. 



The segments of the abdomen are all distinct with the epimera pro- 

 duced in wide plates on either side of the narrow 



middle portion of the segment. 



The sixth or terminal segment is 



without epimera, and terminates 



posteriorly in two small, rounded 



lobes. The pleopoda are five pairs 



of smooth, narrow, elongated, 



biramous appendages, all similar 



and equal in size, with the excep- 

 tion of the inner branch of the first 



pair, which is exceedingly large 

 and is inwardly directed, meeting the corresponding branch of the 

 opposite side in the median ventral line, just below the incubatory 

 pouch. All the remaining branches are directed post-laterally. The 

 surfaces of all the lamellae are quite smooth. The uropoda consist of 

 a single pair of simple appendages, similar in shape and size to the 

 pleopoda. 



The incubatory pouch consists of five pairs of large lamellae, over- 

 2858905 34 



FIG. 572. PSEUDIONE 

 FURCATA. FIRST 

 LAMELLA OF MAR- 

 SUPIUM. 



FIG. 573. PSEUDIONE 

 FURCATA. LEG OF 

 SIXTH PAIR OF ADULT 



FEMALE. X 20. 



