420 EEY. T. R. E. STEBBING ON AMPHIPODA FEOM 



powerful j)i'ocess, at the truncate apex of which are four coupling-spines ; the rami are 

 long, of eleven or twelve joints, the outer ramus the longer. 



Third pleopods. These closely resemhle the second pair, hnt the process of the 

 peduncle appears to be a little less massive and the rami appear rather less strong. 



First wropods. Peduncle slender, more than twice as long as the slender, sixhequal, 

 finely ciliated rami. 



Second urojwds. Shorter, but much stouter, than the first ; the peduncle about twice as 

 long as the stumpy rami, and fringed near the outer margin with some eleven short spines. 



Third nroimds. Membranous, broad above, but together not so broad as the telson; 

 the pointed apex projecting just beyond the telson. In the two specimens figured there 

 is the appearance of a broad basal and a small triangiilar apical joint ; but this may be 

 due to an accidental folding, as in a third specimen these uropods are single-jointed. 



Telson. Much wider than long, membranous, with a few slight setules at the sides ; 

 the apex slightly angular, the angle very obtuse. 



Length. About 5 mm. 



Hah. Lyttelton Harbour, New Zealand. Specimens, labelled " Iphiyenia typical' 

 kindly sent me many years ago by Mr. (now Dr.) Charles Chilton, F.L.S. 



In 1882, Mr. G. M. Thomson, F.L.S., in the ' Transactions of the New Zealand Institute,' 

 vol. xiv. p. 237, established under the family Corophiida? the genus Iphigenia, which he 

 held to be allied to Iciliiis Dana. He described and figured (pi. 18, fig. 6) the single 

 species Iphigenia typica, from two specimens obtained by the dredge in Otago Hai'bour, 

 New Zealand. He gives the length as " 0'12 inch." Upon comparing his description 

 and figures of this peculiar new form with the specimens sent me by his friend 

 Mr. Chilton, I did not A^enture to suppose that there could be a question of more than 

 one sjiecies. Nevertheless, one important feature obviously called for reinark. The 

 Lyttelton Harbour specimens were provided with a four-jointed palp to the maxillipeds 

 (see ' Challenger ' Amphipoda, p. 1638) ; while in Mr. Thomson's figure the palp is 

 three-jointed. As this circiirastance is not referred to either in his generic definition or 

 description of the species, and as the figure itself is small and not very clearly printed, 

 there might be some doubt as to what was really intended. But, to make up for the 

 inadequacy of the printed figures, Mr. Thomson very kindly sent me clear tracings of 

 the large original drawings of some of them. One tracing shows the palp of the 

 maxillipeds considerably overlapping the outer plate, but unmistakably consisting of only 

 three joints. In the accompanying manurcript, full of valuable notes on New Zealand 

 Amphipoda, after explaining that he no longer possessed any specimens of Ipjhigenia 

 typica, Mr. Thomson added, " I have a suspicion that the animal is only a young state of 

 some different form, partly from the apparent absence of one of the thoracic legs and 

 partly because the uropoda appear to be very incomplete." The apparent incompleteness 

 of the uropods was no doubt only due to the difficulty of perceiving the membranous 

 third pair lying closely beneath the telson. As the fifth perteopods are shown in the 

 figure, the absence of one of the thoracic legs can only have been accidental, nor was 

 the immaturity of the specimens likely to have affected the number of joints in the 

 palp of the maxillipeds. 



