Mr. A. O. Walker — Xufcs on Amphipoda. WW 



For references see ' Das 'J'ierroicli,' AmpliipoJa Gam. 

 pp. 0.55 & 739, under Jassi ocius ; also Chevreux, Result. 

 Camp. Monaco, p. 107. 



//. ocius is well described in the ' Ticrreich ' Gammaridea 

 and well fij^ured by Delia Vallt% whose fij^ure o£ gnatho- 

 pod 2 ^ is erroneously marked " ? ," but correctly referred 

 to in the text. To the characters given by various authors 

 may be added the following : — 



Antenna 1 : the accessory flagcllum is so thin that when 

 closely applied to the joint, as it usually is, it can only be 

 distinguished by the fringe of unequal setre on its truncate 

 extremity. 



Gnathopod 2 : the palm is so densely clothed with plumose 

 setae that it is difficult to see its structure. 



Podocerus {Jussa?) denlcx, Czerniavski, is referred to 

 //. OCIUS by Delia Valle antl (Jlievreux, while Sfebbing 

 (Tierreich Gamm.) gives it as a distinct species and identities 

 it with Podocerus hei'dmani^ Walker (= A odontonyx, G. O. 

 Sars). As Czerniavski does not describe the uropods, it is 

 impossible to be certain on this question, but he says that 

 the accessory flagellum of antenna 1 is *' rudimentary '* — a 

 character that suits //. ocius better than J. herdmani. His 

 description of the hand of gnathopod 2 with " dentibus duohus 

 posteriorilnts magnis " (two large posterior teeth) agrees 

 perfectly with IJ, ocius, while a reference to Sars's figure of 

 Podocerus odontonyx i = Jassa herdmani) in Crust. Norway, 

 pi. ccxiii. fig. 2, will show that this spjcies has only one 

 posterior tooth, which I have never known to be bifid. As 

 to the question of the distinctness of J. herdmani iVom J.fal- 

 cata (Montagu), = t/. pulchella, Leach, see Ann. & Mag. Nat, 

 Hist. ser. 6, vol. xv. p. 473, and Trans. Liverpool Biol. Soc. 

 vol. ix. p. 314; also Norman & Scott, Crust. Devon and 

 Cornwall, p. 92. 



The Genus Leptocheirus. 



This has hitherto been classed with the Photidas. I venture 

 to suggest that its proper position is in the Aoridse, with 

 which it is connected by such forms as Coremapus versicu- 

 latus (Bate) and Lendws leptocheirus, A. O. W. ( Trans. Linn. 

 JSoc, 2nd ser. Zool. vol. xii. (1009) p. 338, pi. xliii. fig. 7). 

 The first gnalhopods, though not (oxcept in L. cornu-aurei^ 

 Sovinski) longer, are certainly stronger than the second. 



Ann. d- Mag. X. Hist. Ser. 8. Vol vi. 3 



