ISOPODS OF NORTH AMERICA.. 



521 



which is minute. The second pair of antennae are composed of four 

 articles. 



The seven segments of the thorax are distinct. The first four have 

 well-developed epimera, occupying the anterior half of the lateral 

 margins, each epimeron being placed lateral to the ovarian bosses and 

 produced into an anterior and a posterior lobe. The epimera of the last 



FIG. 567. CRYPTIONE ELONGATA (AFTER HANSEN). a, MAXILLIPED OP FEMALE. 6, HEAD OF MALE 

 (VENTRAL VIEW), c, FIRST INCUBATORY LAMELLA OF FEMALE AND FIRST LEG. d, VENTRAL VIEW 

 OF MALE, e, DORSAL VIEW OF FEMALE. /, VENTRAL VIEW OF FEMALE, g, HEAD OF FEMALE WITH 



BOTH MAXILLIPEDS OMITTED (SEEN FROM BELOW). A, FIRST LEG OF MALE, i, FIFTH LEG OF MALE. 



three segments are not distinct from the segments. The anterior por- 

 tion of the last three segments is produced into a large lobe which occu- 

 pies the entire lateral margin, the posterior portion of the segment 

 being small and sublateral, i. e. , it lies on the inner side of the ante- 

 rior portion. The anterior lobes are larger on one side of the body 

 than they are on the other side, and they have an additional small, 



