'2?>8 Rev. T. R. R. Stebbing on the true Podocerus 



distinct genera, not one of them with any certainty falling 

 as a synonym to Montagu's species. 



The description of Podocerus variegatus above quoted from 

 Leach is far from suiting the account which Milne- Ed wards 

 appends to the name in his ' llistoire naturelle des Crus- 

 taces,' vol. iii. p. 63. He omits all mention of the hemi- 

 spherical eyes, states that the second pair of hands have no 

 teeth on the lower margin, and assigns a pretty strong median 

 tooth to the hind margin of the last segment of the perseon 

 and the first of the pleon. There is in truth only one 

 Amphipod known as inhabiting the rocky shores of Devon 

 which reasonably answers to the various characters indicated 

 by Leach. This is the species described and figured by 

 Bate and Westwood (' British Sessile-eyed Crustacea,' vol. i. 

 p. 481) as Cyrtophium Darwinii. It has the proper colouring 

 and habits ; the eyes tally with the description, and the 

 gnathopods have a sufficient correspondence. It is true that 

 the ovate hand of the second gnathopod in the male has two 

 processes on the internal side, but these are so concealed 

 among the long fringing setae that the general effect is that 

 of a straight lower, inner, or hind margin. The under an- 

 tennas are conspicuously longer than the upper, and it is 

 interesting to notice that "the last joint" — the flagellum — 

 which Leach describes as "scarcely articulated," is shown in 

 Bate and Westwood's figure of it as a single piece, though in 

 the text they explain that it " consists of one very long and 

 one or two minute terminal articuli." In regard to this 

 species Bate and AVestwood make, without seeing the bearing 

 of it, the important observation that u some specimens (mixed 

 with those of the genus Podocerus) have long existed un- 

 recognized in the collection of the British Museum, procured 

 by Dr. Leach probably from the south coast of Devon." 



In the ' Regne Animal de Cuvier,' published after Cuvier's 

 death, without dates, and variously cited as 3 e e*dit., edit. 

 illustre*e, or edit. Crochard, Milne-Edwards gives a represen- 

 tation of Podocerus variegatus (pi. lxi. fig. 4), purporting to 

 be drawn irorn Leach's type in the British Museum. When 

 one considers that the drawing must have been made some 

 sixty years ago from a dried specimen more than twenty 

 years old, minute accuracy is little to be expected. The 

 two dorsal teeth, which Milne-Edwards, as above mentioned, 

 describes in his later work, are doubtless due to an optical 

 illusion with which every student of Amphipoda must now 

 be familiar. In the so-called Cyrtophium Darwinii the 

 imbrication of the segments which gives rise to the illusion is 



