274 A MONOGEArn of the Australian aphroditea, 



the ventral cirri are very sliort. The scales are delicate, colourless 

 and semitransparent. The dorsal setse are partly filiform, partly 

 curved and simple ; one or two of them are straight, with harpoon- 

 like teeth near the apex, three on one border and four on the 

 other. The ventral setse are two in each parapodium, abruptly 

 bent near the apex, with a strong, pointed tooth opposite the 

 bend, and two smaller teeth and a fringe of hairs in the apical 

 portion — the ax^ex acute, slightly hooked. The length is three- 

 (juarters of an inch. 



Port Molle, 1 5 fathoms. 



This species differs from Aphrogcnid alha of Kinberg, (Eugenics 

 Eesa, p. G, pi. ii., fig. 6.) which it rather nearly resembles, in 

 tlie much greater length of the lateral tentacles and of the dorsal 

 cirri, and the i)resence of harpoon-like dorsal seta). 



Genus Triceratia, {iwv.) 

 Similar to Uermione, but with three tentacles on theprjcstomium 

 and without barbed seta). Scales covered with a layer of felted 

 hairs. 



Triceratia aroeoceras, sp. n. (Pi. VII., figs. 8 — 13, and PL VIII., 

 figs. 1 and 2.) 



The body presents 42 segments bearing setoo. The pra^stomium, 

 which is completely concealed by the scales, is very small and 

 bears three long and extremely slender tentacles, the middle one 

 longer than the lateral, all three with a slight swelling near the 

 extremity. The peristomium is not distinct, but has a pair of long 

 and stout tentacles ornamented with minute papillce. The first 

 segment of the body has a bunch of Hax-like hairs on the 

 rudimentary parapodia, and slender dorsal and ventral cirri. 

 The neuropodia and notopodia of the following segments are 

 distinct ; the former have four stout brown setae, Voth of an inch 

 in length, bifurcate at the extremity, one branch being very short 

 and tooth-like. The dorsal settc arc partly directed upwards and 



