rilRONIMIDJE. ;il7 



duceil to nearly half the length of the propodos ; propodos cylin- 

 drical, arcuate, sliglitly tapering, seiTated on the inferior margin 

 with small teeth that gradually increase anteriorly to every fourth 

 or fifth denticle; dactylos short, terminating in a double point, 

 and Hanked at the posterior extremity Avith dadijloptera* , having 

 the inferior margin of the outer finely pectinated, and of the inner 

 finely serrated : second pair rcsenibUng the fij-st, but longer, 

 and ha\"ing the carpus not so prominently produced. Fii'st pair 

 of pereiopoda as long again as the gnathopoda, cyUndi-ical, tapering ; 

 dactylos minute : second pair like the first, biit longer and more 

 robust : third pair having the carpus antcro-distally produced to 

 nearly the length of the proi)odos, cyHncMcal, robust, tapering, 

 curved, inner margin subcentrally furnished "with a projecting 

 tubercle that is tuberculated on the apex and posterior margin, 

 and on the concave margin behind it; propodos long, slender, 

 tapering to a point, arcuate, the inner margin being furnished wdth 

 a tubercle tliat impinges against that on the carpal process on the 

 distal sui'face, and tuberculated on the top and on the distal mar- 

 gin as well as the concave surface beyond the tubercle ; dactylos 

 obsolete. Two posterior pairs of pereiopoda subequal, ha\dng the 

 basa long, remaining joints short. Penultimate pair of plcopoda 

 shorter than the other two. Telson rudimentary. 

 Length 1 inch. 



Hah. Nice (liisso) ; Burray, Shetland Islands (Dr. Flemhig) ; Bay 

 of Naples (Mr. Pratt). 



Tlie figure in this Catalogue is taken from a specimen in the 

 British ^luseum, from an imknown locality. It appears to bo iden- 

 tical with that taken by Dr. Fleming, in the collection of British 

 Amphipoda in the Museum. I have compared it with specimens, 

 entnisted to me from the Jardin des Plantes, found at Nice, and I 

 can perceive none but microscopic differences in the strength of the 

 ai-mature — the tiiliercles and serrature being more prominent on the 

 specimen from Nice than on that in the British Museum. Bisso 

 descrilies P. sedentaria as being transparent, shining, and covered 

 with red spots. Desmarest states it to be found in the cavities of 

 Pyrosoma and Beroe. 



2. Phrouima custos. (Plate LI. fig. 2.) B.M. 



Phronima ciistijs, lii.'^so, Jlid. den Crust, dc Nice, p. 121. pi. 2. f. 3. 

 Dcsiiutnat, Voiusid. sitr ics Crust, p. 9'5. 

 Edwards, Hist, des Crust, iii. p. 93. 



Third pair of pereiopoda broader than in 7'. sedentaria, and having 



» This iiaim- in supfijt'stcd for (lie two little \vin;^-lik(" plates on eaoli pair of 

 gimthoijoda, nml which have not hitherto heeu (Icserilwcl hy authors. 



