NO. 13M. NATURAL HISTORY OF THE ISOPODA— RICHARDSON. 



79 



Fig. 61).— Pseudione furcata. a, dorsal \iew of female; 

 6, ventral view of same. X 4. 



PSEUDIONE FURCATA, new species. 



Body of female longer than ))i'oa(l, more or less ov^ate. 

 Head with frontal border; anterior margin nearly straight; posterior 

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

 Mouth parts and an- 

 tenna? concealed by 

 first lamelliB of mar- 

 supium. The first an- 

 tennae 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 seg- 

 ments. The epimera 

 on these segments 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 exception of the 

 inner branch of the first pair, which is exceedingly 

 large and is inwardly directed, meeting the correspond- 

 ing 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 lamella^ 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 lamelhi', overlapping in the median line. 

 First pair of plates with the terminal lobe not 

 defined. 



There is a high and widely rounded expansion 

 or carina on the basis of all the legs. 

 Male unknown. 



Four specimens were collected on the eastern 

 shore of Virginia by Prof. H. E. AVebster. Host unknown, 

 were sent from Union College to the Smithsonian Institution. 

 Ti/jjc— Cat No. 29093, U.S.N.M. 



Fig. 70.— Pseudi- 

 one FrRCATA, 



first lamella 

 of marsupium. 



Fk;. 71.— Pseudione fur- 

 cata, LEG OF SIXTH PAIR 

 OF ADULT FEMALE. X 20J. 



They 



