Victorian Fresh-water Amphipoda. 231 



end of the third pair; second shorter, its outer ramus rather 

 shorter than the inner; third with peduncle short, rami subequal, 

 lanceolate, inner and outer margins fringed with spinules, from 

 the axils of which spring long plumose setae. Telson long, cleft 

 almost to the base, its outer lateral margins setose, and gradually 

 curving to a pointed apex, its dorsal surface with a few fascicles 

 of setae. 



Length. — Largest specimen 11 '5 mm. 



Colour. — Very varied, sometimes almost free from colour, and 

 semi-translucent, at other times more or less flecked with indefi- 

 nite markings of brilliant pink over the cephalon, back, and 

 sides, and also the anterior appendages. 



Occurrence. — Streamlet at Thorpdale (Gippsland); Dandenong 

 Creek, near Bayswater (collected by J. Gabriel); and from Math- 

 inna Falls, Fernshaw. Altitude about 1,500 feet. 



Remarks. — This species favours swift running mountain 

 streamlets. It agrees with Stebbing's description in the " Chal- 

 lenger Report " of his genus Atyloides, except in the inner plate 

 of the second maxillae being apicaljy narrow, and bearing but 

 three plumose setae and not " many." It is specially charac- 

 terized, in contradistinction to other species of the genus, by the 

 lobed carpus of the gnathopods, and also by the expanded second 

 joints of both the mandibular and maxillary palpi. Three species 

 hitherto have been described, and all of marine habit. They are 

 recorded from the following localities: — Ofl' Cape of Good Hope; 

 near Cape Horn ; Kerguelen Island ; Port Jackson (New South 

 Wales) ; Port Phillip Bay (Victoria). 



Supplementary Description. 



Anterior Lip. — Broad, the end almost straight, and thickly 

 furred with short stout setae. 



Mandibles. — That of the left side has the outer plate divided 

 into six teeth, the two end ones being large and subequal, and 

 the four preceding ones smaller ; the inner plate is formed of five 

 teeth, the end one being conspicuously longer than the others ; 

 the spine row is furnished with twelve stout curved pectinated 

 .spines. 



