536 



BULLETIN 54^ UNITED STATES NATIONAL MUSEUM. 



and project in an anteriorly acute process. In the third, fourth, and 

 fifth segments the epimera are narrow, elongated plates, occupying 

 the anterior half of the segments. In the last two segments they are 

 also narrow and elongate, and occupy nearly the entire length of the 

 segment. 



The a))domen is abruptly narrower than the thorax, the first seg- 

 ment being much narrower and deeply set in the thorax. The four 



following segments are as 



wide as the seventh thoracic 



segment, and gradually in- 

 crease in width to the sixth 



segment, which is very wide. 



The terminal segment is nearly 



twice as wide as long; it is lO 



nmi. wide, 4 mm. long in the 



median longitudinal line, and 



mm. long in the lateral por- 

 tions.. The post-lateral angles 



of this segment are rounded, 



the posterior margin being 



The ui'opoda are as long as the terminal segment, 

 are equal in width, and are rounded at the extremities. The outer 

 branch is very slightly shorter than the inner branch. 



All the legs are prehensile, with long, nafiTow curved dactyli, those 

 of the fourth pair being the longest. There is a high carina on the 

 basis of the last four pairs of legs, the height of the carina increasing 

 from the fourth to the seventh pair, where it is extremely high." 



Fig. 23ii. — Ceratothoa 

 iMPEEssA. Seventh 



LEG. X JJ. 



deeply excavate 



Fig. 240. — Ceratothoa im- 

 PREssA (After Schicedte 

 axuMeinert). a, Ungul5\. 



OF first pair of LEGS OF 

 YOUNG OF SECOND stage, h, 



Ungula of sixth pair of 

 legs of young of second 

 stage. (Enlarged.) 



88. Genus MEINERTIA Stebbing.'' 



Body oblong. 



Head more or less deeply innnersed or set in the first thoracic 

 segment. Eyes distinct. First pair of antenmv dilated, contiguous 

 at the base. Second pair of anteiuife compressed. 



First thoracic segment with the anterior margin widel}- sinuated or 

 almost straight. Anterior epimera do not reach l)y a great but gradu- 

 ally decreasing distance the posterior angle of the segments. The 

 posterior epimera almost reach or s(jmetimes extend a little l)eyond 

 'the posterior angles of the segtuents. 



Terminal segment of al)domen triangular, semicircular, often bilobed. 



«For description of the male and the female and the young of the first, second, 

 and third stages, see Sehioedte and Meinert, Nat. Tidsskr. (3), XITT, 1881-83, pp. 

 30 1-308. 



''See Schicedte and Meinert for characters of genus, Nat. Tidsskr. (3), XIII 

 1881-83, pp. 322-323. 



