ISOPODS OF NORTH AMERICA. 



317 



Di'scr/ption of female. — Body ovate, twice as long as wide, 3 mm.: 

 (^ mm. 



Head Mearly three times as wide as long, 1 mm.: 3 mm., with a 

 frontal border arising between the e^^es and produced in a small median 

 point. 'ri:3 eyes are small, round, composite, and situated in the post- 

 Literal angles of the head. The Hrst paii- of antennie have the basal 

 article long and stout; the second article is less than half as long as 

 the first and is of ef^ual width; the third is twice as long as the second 

 and half as wide. The flagellum is com[)oscd of ten articles. The 

 first antennje extend almost to the posterior margin of tite first thoracic 

 segment. The basal article of the second antenn.e is very short; the 

 second is twice as long; the third is one and a half times longer than 

 the second; the fourth is a little longer than the third; the fifth is a 

 littl(^ longei- tiian the fourth. The ilagellum is composed of twelve 

 articles. The second pair of antenuic extend to the posterior margin 



Fig. 34«.—ClLIC.t:A CAUDATA (FEMALE). «, MANDIBLE. X 51f. ft, MA.XILLIPED. 



LAMI.NA AND CLYPEUS. X ^Vi. 



>; 5l|. c. Frontal 



of the second thoracic segment. The maxilliped has a palp of five 

 articles. The ])alp of the mandibles is composed of three articles. 

 The frontal lamina is large and conspicuous and has a V-shaped raised 

 margin pointing anteriorly. 



The first segment of the thorax is twice as long as any of the 

 others. The epimera are not distinct from the segments, but a 

 lighter area and a slight depression marks the place of coalescence. 

 The lateral margins are straight, with the outer post-lateral angle 

 slightl}' produced. 



The al)domen is composed of two segments. The first segment is 

 as long as the first thoracic segment, and has thi'ee suture lines on 

 either side, indicating as many coalesced segments. The terminal 

 segment has the anterior convex portion surmounted with three tuber- 

 cles in a transverse row, the middle one being in the median longi- 

 tudinal line. The shape of the .segment is somewhat triangular, with 

 the bluntly rounded apex produced, the sides of the extremity folding 

 under to form a groove, which is incomplete on the ventral side. The 

 immovable inner branch of the uropoda extends two-thirds the length 



