242 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 247. MEINERTIA GILBERTI. a, SECOND MAXILLA. 

 x 27}. b, FIRST MAXILLA, x 27}. c, MAXILLIPED. 

 x 15}. 



second pair consist of eight joints and reach the posterior margin of 

 the head. 



The first four segments of the thorax are about equal in length, the 

 second being somewhat shorter. The last three segments decrease 



gradually in length. The 

 epimera are narrow pieces 

 at the sides of the segments; 

 in the first five segments 

 they do not reach the pos- 

 terior margin of the seg- 

 ments, although the fifth 

 pair more nearly reach the 

 posterior margin than the 

 others; the epimera of the 

 last two segments reach 

 quite to the posterior 

 margin. 



The first segment of the 

 abdomen is as wide as the last thoracic segment. The others are w r ider, 

 increasing in width gradually to the terminal segment. The last seg- 

 ment is about three times as broad as long, and quadrangular in shape. 

 The uropoda are short, reaching only a little beyond half the length 

 of the abdomen; both branches are alike and of equal 

 length. 



The legs all terminate in long recurved unguli. 

 There is no high carina developed on the basis of 

 any of the legs. 



Color reddish brown. 



Three specimens, two males and one female, were 

 collected by Prof. C. H. Gilbert at Mazatlan. They 

 were found in the mouth of Mug! I 

 hospes. 



Type. Cat. No. 29080, 

 U.S.N.M. 



This species differs chiefly from 

 M. gaudichaudiH^\\\nQ Edwards)" 

 from near locality, in the absence 

 of high carinse, which in M. 

 gaudichaudii are strongly devel- 

 oped on the last four pairs of legs; in the much shorter uropoda, 

 which in M. gaudichaudii extend beyond the terminal segment, both 

 branches of which are narrowly pointed at their extremities; in the 

 much larger eyes, and in the smaller size of the species, the adult female 

 being only half the size of the adult female of M. gaudichaudii. 



aNaturhistorisk Tidsskrift, XIV, 1883-84, pp. 335-340, pi. xm, figs. 11-15. 



FIG. 248. MEINERTIA 

 GILBERTI. LEG OF 

 SEVENTH PAIR. X 7. 



FIG. 249. MEINERTIA 

 GILBERTI, X 2|. 



