80 MESSRS. NOEMAN AND STEBBING ON THE 



Perseopods slender, the coxa always very long, more or less covered with setag and 

 spines, the varied form and structure of wliich are useful for diagnosis. 



Pleopods composed of a peduncle and two setiferous branches. 



Uropods two-branched, the inner filament of great length and multiarticulate, the 

 outer shorter, though also multiarticulate. 



't3^ 



Synopsis of Generic Distinctions o/" Apseudidse. 



Lower antennae with a scale articulated to the end of the second joint. 

 First free segment with the epimera conspicuous, spine-formed, 



porrected. Gnathopods fiirnished with minute palps , . . Apseudes, Leach. 

 First free segment with epimera small and not produced forwards. 



Gnathopods without palps Parapseudes',G.O.SaLTs. 



Lower antenuje without a scale. 



Carapace composed of head and two following segments coalesced . Sphyrapus, n. g. 



Genus 1. Apseudes, Leach. 

 —Eupheus, Risso, =^Rhoea, Milne-Edwards. 



Animal elongate, gradually attenuating from the first to the last segment ; pleon 

 equal in length to 2| or 3^ last segments of peraeon. 



Carapace usually furnished with a distinct rostrum, which is very variable in form 

 and often long and acute. Eye-lobes with or without eyes, usually pyriform, rarely 

 taking the form of a large spine. First free segment with the epimera spiniform and 

 inclining forwards. Last segment of pleon never produced to an elongated point, 

 obtusely rounded or truncate at the extremity. 



Upper antennae nearly alike in the sexes, outer flagellum longer than the iimer. 

 Lower antennae with a distinct, movable, antennal scale, ciliated, attached to the second 

 joint of the peduncle. 



Epistoma with or without a spine. 



Gnathopods of both pairs furnished with a minute and inconspicuous two-jointed 

 palp at their base. The first pair with chelate hands, larger in the male than in the 

 female; second pair with the hand usually ovate, flattened. 



Pleopods well developed. 



Leach's most erroneous and misleading figure of Apseudes talpa was copied through 

 a long series of years into numerous publications as the illustration of this genus. The 

 first fair figure was that which Milne-Edwards gave of his Mhoea latreillii. These two 

 species until recently were the only known representatives of the family. 



1 The typical and only known species of this genus is the Apseudes latifrotis, Grube (Die Insel Lussin und 

 ilire Meeresiauua, p. 75). 



