HYPERrDJE. 299 



of pleopoda shorter than the antopenultimato : ultimate liavinp: the 

 I)e(hmele very short ; rami very unequal, the inner one being the 

 hirger, the outer ono the longer and narrower. 

 " Length Sh lines. 



'' Ilah. Coast of Naples." — Costa. 

 This is very like H. oblivia. 



9. Hyperia Lesueurii. 



Hyperia Suerii, Latreille, Encycl. Method, ix. t. 328. f. 17, 18 (1824). 



DcsiiHirest, Coiisid. sxr Ivs Crust, p. 258. 

 Hyperia Lesuemii, Edwards, Ilist. des Crust, iii. p. 77. 



" Four antenna) setaceous. Pereiopoda terminated by a simple 

 pointed joint. Cephalon rather small, round, fiat in front, not 

 prolonged into a rostrnm. Body conical, terminated by two tri- 

 angular, elongate, hoiizontal lamellae." — Desmarest. 



I regret not having had the opportunity of studying the descrip- 

 tion of Latreille in the work above quoted, the more especially since 

 it is that of the type on which the genus was founded. The descrip- 

 tion given by Desmarest, for which he expresses his obhgation to 

 Latreille, is so imperfect that it will do for any species of the genus, 

 except for the fact that the telson in H. Lesueurii consists of two 

 triangular, elongate, horizontal lamellae — a characteristic that, to 

 say the least, is doubtful, as there is no genus in the family so 

 distinguished. 



Desmarest gives the scientific name as II. Suerii, Latr. ; but since 

 the popular one is Hyperie de Lesueur, I have considered it a typo- 

 graphical error and followed M. -Edwards. 



3. VIBILIA. 



\ibilia, Edwards, Ann. des Sc. Nat. xx. p. 38G ; Hist, des Crust. iii. 



p. 72. 

 Lanceola, Say, Proc. Acad. Philad. p. 317. 



Cephalon small. Pereion smooth, not distended. Eyes small. An- 

 tennae subequal : superior pair terminating in a uniarticulated 

 flagcllum : inferior pair slighter than the superior, terminating in 

 a multiai'ticulate flagellum. First pair of gnathopoda cyhndi-ical, 

 hax-ing the inferior angle of the carpus but little, if at aU, i)ro- 

 duced : second pair having the inferior angle of the meros and 

 caqias considerably produced anteriorly. First two pairs of 

 pereiopoda tolerably long, subequal ; third and fourth pairs 

 much longer than the preceding and subequal ; fifth pair very 

 short. Three posterior pairs of pleopoda uno(iual, the last pair 



