104 KECoiUiS Of THE AUSTKALIAX MUSEUM. 



posterior angle of the preceding keel, only moclei'atel}- rounded, 

 and with a minute tooth pointing outwards ; posterior angle 

 somewhat overreaching the level of the posterior margin. 

 Keels of the following segments very small, pad-shaped, 

 thickened on the poriferous segments, completely rounded 

 anteriorly, Avith posterior angle distinct as in A. ruiiihou'i . 

 Suture neatly sulcata, more coarsely than in ^4. Icoscluscovaijnm, 

 appearing granular. Metazonites five to seventeen somewhat 

 flattened and divided by a well marked transverse sulcus, the 

 bottom of which is punctured. Pores opening sideways at a 

 small distance of the posterior angle of the keels 5, 7, 9, 10, 

 12, 13, 15 to 19. Last segment of the usual form. Sette not 

 mounted on graniiles. Valves globular, strongly shining, 

 with thin upi'aised mai'gins and a couple of low setiferous 

 granules on each side. Anal sternite yellow, large, rounded, 

 with a pair of marginal setfe. 



Sternite of segments spineless, hairy, with well marked 

 cross impressions. Pleurosternal suture adorned with a tiny 

 arched ridge on the segments three, four and five, quickly 

 disappearing backwards. Legs moderately long, almost naked 

 above, pilose below. Third joint scarcely longer than the 

 breadth of the corresponding sternite ; sixth joint but a trifle 

 shorter than the third. 



Male : — The brush which adorns the ventral surface of the 

 tarsi is dense and thins out only in the last pair of legs. First 

 pair of legs thickened, with a blunt tooth on the anterior 

 surface of the third joint ; claw normal. The sternal lamella 

 of the fifth segment is I'ectangular, not wider distally, 

 slightly curved, ])ointing onwai-ds and downwards ; it is 

 shortly pilose on* its anterior surface. The sternite of the sixth 

 segment is simply flattened, not excavated. 



The coxal aperture resembles that of A. ndiihoiri^ in being 

 provided with a strong tooth projecting far out above the level 

 of the bod}' ; yet the anterior margin is not as straight ; 

 it is strongly and angularly produced backwards, the apertui'e 

 l)eiiig thus considerably conti-acted on the middle line. In 

 fi'ont of the outer angles of the aperture, thick ridges ai-e to 

 l)e seen directed obliquely onwards, the outer end of which is 

 abruptly rounded while the inner die out before meeting on 

 the middle line of the body. The legs of the ninth pair are 

 stronfflv driven aside. 



