304 AMpniropA xotimama. 



5. Vibilia speciosa. 



Vi])ilia speciosa, Costa, Rt'iul. dclla Rvale Accad. dvlle Set. di Napoli, 

 1853, p. 178. 



" With tlio back arched. Ccphalon sHglitly triangularly produced in 

 front. First segment of the pereion short. Superior antennae as 

 long as the eepluilon and first segment of the pereion ; peduncle 

 short ; flagellum lanceolate, sides incurved, unanned. Inferior 

 antennae slender, filiform, and shorter than the superior. 



" Length 3i lines. 



" Huh. Coast of Naples." — Costa. 



6. Vibilia pelagica. 



Lanceola pelagica, Say, Proc. Acad. I'hilad. i. p. 317. 

 Ilyperia pelagica, Edwards, Ann. dcs Sc. Nat. xx. p. 387 ; Hist, des 

 Crust, iii. p. 77. 



Cephalon short, transverse, sujieriorly produced anteriorly to an acute 

 angle ; frontal margin concave. Pereion oval, convex above and 

 beneath, imbricated; first segment shortest; second and third 

 longest, cciual. Pleon abruptly narrower than the pereion. Eyes 

 longitudinal, opposite to the base of the superior antennae. Superior 

 antennte short, compressed, reaching to the extremity of the pe- 

 duncle of the inferior pair ; peduncle robust, concealed ; flagellum 

 not articulated, linear, compressed, obtuse. Inferior antennae more 

 than half the length of the pereion ; peduncle short ; flagellum 

 not articulated. Mandibles having an appendage*. Gnathopoda 

 short, compressed ; first pair the shorter, having the coxa produced 

 anteriorly. Pereiopoda cylindrical ; first and second pairs sub- 

 equal ; third pair longest ; fourth pair longer than the pereion ; 

 fifth not longer than the first and second. Three posterior paii'S 

 of pleopoda consisting of a foHaceous linear peduncle supporting 

 two acute, lanceolate, subequal rami ; antepenultimate and penul- 

 timate pairs equal ; ultimate pair rather shorter. Telson attenu- 

 ate. — (Condensed from Saif.) 



Length li inch. 



Hub. Gulf Stream. 



7. Vibilia depilis. (Pxate XLIX. fig. 10.) 

 Thaunialia depilis, Templeton, Trans. Ent. Soc. i. p. 186. pi. 20. f. 2. 

 " Cephalon anteriorly produced over the fh'st joint of the peduncle of 



f " Antenna?foi'm processes." Tliis term, wliich Say frequently uses in his 

 descriptions, I consider to refer to the mandibular appendages that are frequently 

 seen projecting, like a tliird and smaller pair of antenna?, between or beneath the 

 others. 



