REPORT ON THE AMPHIPODA. 949 



Fourth Perasopods. — The side-plates much smaller than the preceding pair, unequally 

 bilobed. 



The Fifth Perajopods and all the pleon were missing. 



The minute fragment of which this specimen consisted was not measured before 

 dissection, as from its condition it did not seem suitable for description. But as 

 eventually it proved to be the only representative of the genus Dexamine, Leach, in the 

 collection, it seemed worth while to take note of it, if only for the sake of the maxillipeds, 

 and these are of interest, even if the reference to Dexamine should have to be set aside 

 when the undeseribed portions of the animal become known. The palp of the first 

 niaxillas certainly appears to be two-jointed, which is contrary to the character assigned 

 by Boeck to the genera Dexamine and Tritazta. 



Locality. — Station 186, Flinders Passage, September 8, 1874; depth, 8 fathoms; 

 bottom, coral mud. 



Remark. — The specific name refers to the place of capture. 



Genus Stenopleura, n. gen. 



Mandibles with multidentate cutting plate, secondary plate on the left mandible, 

 strong molar tubercle ; palp robust, its second and third joints subequal in length. 



First Maxillae with the inner plate small, carrying one plumose seta on the 

 apex. 



Inner plate of the Second Maxillse shorter, scarcely broader than the outer. 



Maxillipeds with the inner plate not reaching beyond the base, the outer not 

 beyond the apex, of the first joint of the palp ; the palp's last joint long and sharp. 



The Antenna? with short peduncles and long flagella, the upper longer than the 

 lower. 



The side-plates all shallow, the fifth as deep as the fourth. 



The two pairs of Gnathopods alike, subequal, the hand as long as the first 

 joint. 



The first and third joints of the First and Second Perasopods not slender. 



The first two pairs of Uropods with the outer rami much shorter than the inner ; 

 the third pair with short peduncles, long rami ; the outer rather shorter than the 

 inner. 



Telson undivided, with sculptured end, not shorter than the third peduncles of the 

 third uropods. 



The generic name is derived from crTtvo*;, narrow r , and irKtvpa, side, in allusion to 

 the shallow side-plates. The genus appears to be inosculant between the Atylidse 

 and Eusiridse. 



