REPORT ON THE AMPHIPODA. 913 



Length. — The specimen, in the position figured, from the front of the head to the back 

 of the third pleon-segment, measured half an inch. 



Locality. — Station 161, off Melbourne, April 1, 1874; depth, 33 fathoms; bottom, 

 sand. Several specimens ; the one examined was a female. 



RenmrJcs. — The relationship of this species to Atylus vedlomensis, Bate and Westwood, 

 is striking and close, and that species is itself not far removed from Atylus sivammer- 

 damii, Milne-Edwards, with which Mr. Haswell compares this. When figuring it, now 

 some years ago, I had named the species Atylus acutus, but upon comparison with Mr. 

 Haswell's account of Atylus homochir, I have thought it better to accept his name for 

 the species, since the differences in his account and figures may be probably attributed to 

 the smallness of the specimen he examined. 



Genus Atyloides, n. gen. 



Mandibles with palp well developed, the third joint as long as the second, or 

 nearly so. 



First Maxillss with many plumose setae on the inner plate. 



Second Maxillse with the plates elongate, many plumose setae on the side of the 

 inner plate. 



Maxillipeds as in Atylus, except that the outer plate does not reach the apex of the 

 second joint of the palp. 



Body not carinate or dentate ; the fifth and sixth segments of the pleon separate, not 

 coalesced. 



Upper Antennee with a one-jointed accessory flagellum. 



In other respects like Atylus. 



The generic name refers to the likeness between this genus and Atylus. 



From Pontogeneia, Boeck, the new genus is distinguished by the palp of the 

 mandibles, by the spine-teeth (not slender spines) on the inner margin of the outer 

 plate of the maxillipeds, by the antennae, of which the upper are not longer than the 

 lower, and have an accessory appendage which appears to be wanting in Pontogeneia. 

 From Amphithopsis, Boeck, which is a synonym of Pherusa, Leach, it is distinguished in 

 like manner by the antennae, by the numerous setas on the inner margin of the inner 

 plate both in the first and the second maxillae, and by the cleft telson. The name 

 Paramasra, Miers, was given under a misapprehension of the characters of the species 

 for which the genus was instituted, and being suggestive of an affinity which does not 

 really exist, is scientifically unsuitable. It was upon fuller knowledge withdrawn by Mr. 

 Miers himself, and cannot, I think, be conveniently revived; see Note on Miers, 1875 

 (p. 447). 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) XxX 115 



