REPORT ON THE AMPHIPODA. 637 



or three very small spines, hind margin very, but not evenly convex, rather deeply 

 serrate ; third joint not dilated ; rest of the limb missing. 



Pleopods. — The round-headed couj^ling spines have from three to four retro- 

 verted teeth ; the rami have each from nineteen to twenty joints carrying densely 

 plumose setae ; the first joints vary in the different pairs, being longer in the first 

 pair than in the second, and in the second than in the third ; the first joint has in the 

 first pair thirteen or fourteen plumose setaj on one margin and four on the other, but 

 fewer in the following pairs ; the first joint of the inner ramus in the first pair has six 

 cleft spines, in the second pair, I believe, only five, and in the third pair only three. 

 The number of these spines, therefore, will not be of service as a specific character, 

 unless all three pairs of pleopods are carefully scrutinized. 



Uropods. — The peduncle in the first pair longer than the slender rami, of which 

 the outer is but slightly longer than the inner ; peduncle in the second pair equal in 

 length to the rami, which are equal to one another, shorter than those of the preceding 

 pair ; peduncle in the third pair much shorter than rami ; outer ramus with a nail, spines 

 on or near the outer border, plumose setae on more than half the inner border as far as 

 the nail ; inner ramus slightly shorter than outer, with spines on both borders, and 

 plumose setae all along the inner border. 



Telson reaching beyond the peduncle of the third uropods ; cleft for two-thirds or 

 more of its length, the plates a little dehiscent dis tally, the apex of each rather more 

 produced on the outer than the inner side of the terminal spine cavity; on each border 

 two spines and between them a small feathered spiny seta. 



Length. — The specimen measured, without the antennae, nearly half an inch. 



Locality. — Station 161, ofi" Melbourne, April 1, 1874; depth, 33 fathoms: 

 bottom, sand. One specimen. Trawled. 



Remarhs. — The specific name refers to Geelong, near the Station at which this 

 species was captured. 



I was tempted, chiefly on account of the mouth-organs, to refer this species to a 

 new genus intermediate between Callisoma and Hippomedon. The mandiliular palp 

 agrees with that of Callisoma crenatum, Spence Bate, in its shape, but in its position 

 with that in the species of Hippomedon. The inner plates of the second pair of 

 maxillaB agree in their armature with Callisoma and not with Hippomedon, those of 

 the first pair also disagreeing with Hippomedon as described by Boeck. The palps 

 of the maxillipeds, the antennae, the third uropods and telson nearly resemble the corre- 

 sponding parts of Callisoma crenatum, while the gnathopods and other features are in 

 closer agreement with Hippomedon kergueleni. However, on examining dissections of 

 a specimen of Hippomedon ahyssi (Goes), kindly lent me by Canon Norman, I found 

 that the inner plate of the first maxilla had, like the present species, more than two 



