290 A MONOGRAPH OF THE AUSTRALIAN APHRODITEA 



The ventral tubercles are not prominent. The ventral setae are 

 numerous, similar to those of Thormora argus, but with a 

 subapical tooth. The dorsal setse are about half the length of the 

 ventral, stouter, slightly curved, with the appearance of a row of 

 obscure serrations on the convex side produced by a series of 

 transverse ridges. The colour is light reddish-yellow with short 

 transverse grey bands on the dorsal surface ; the head is purple ; 

 the tentacles are ornamented with blackish bands ; the cirri are 

 colourless. 



Found among mussels both between tide marks and at a depth 

 of 15 fathoms in Port Jackson. 



Antinoe prseclara, sp. 7i. (PL IX., figs. 10-12.) 



The body contains 37 segments with 14 pairs of scales. The 

 head is rather prominent, broadening slightly behind. The mesial 

 tentacle is 2^ times the length of the head, ornamented with 

 scattered cilia, and very slightly dilated near the apex. The outer 

 praestomial tentacles are extremely short, not more than a third 

 of the length of the mesial, and slender. The inner peristomials 

 are as long as the mesial tentacle, stouter, pointed, not dilated 

 near the apex and not ciliated. The outer peristomials are shorter 

 than the inner, slightly dilated near the apex, and with a slender 

 terminal portion. The parapodia are distinctly divided. The dorsal 

 setae, which are about twenty in number, are very slightly curved, 

 and very slightly recurved at the extremity, which is subacute ; 

 on the convex side in the distal half are numerous transverse 

 rows of minute and short spinules, or transverse ridges terminated 

 by spinules, which only extend about half-way round the seta. 

 The ventrals are of two kinds ; the one kind are very much longer 

 than the others, slender, subacute and almost imperceptibly 

 arcuate, bidentate ; on the concave aspect, in about its distal 

 fifth, each seta is armed with two short longitudinal rows of 

 alternating transverse combs of minute spinules, and on the 

 convex side with a row of strong teeth ; the other set of setae are 



