106 AUSTKALIAX tYLLIliAf,, KUSYLLIHAE AXD AVTOLYTIDAE, 



of the prostomiiim . In the specimen last referred to there is no clear indication 

 that there are two eyes on each side, and only one lens is distinguishable; Imt in 

 the remaining males the anterior and [losterior eyes, though intimately united, are 

 to be distinguished by their sei)arate lenses and by slight fissures. In the female, 

 on the other hand, the eyes are quite small and separate; in front of each an- 

 terior eye is a small frontal eye which appears to have a small lens. 



The palpi are Cjuite conspicuous both in the living and fixed specimens, 

 'i'heir basal parts are fused to form a transverse bridge in front of the mouth. 

 From this bridge, the anterior edge of which is slightly in front of the anterior 

 border of the prostomium, s(>parated from one another by a wide- interval, arise the 

 free portions of the palpi as uvate processes projecting forwards in front of the 

 prostomium, or doubled back on the ventral side. There is no trace of a nuchal 

 prominence . 



The tentacles and cirri present no trace of definite segmentation, though ir- 

 j-cgularly annulated. Tlie median tentacle is about twice the length of the pros- 

 tomium, the lateral a little shorter than the median. Of the peristomial tentacles 

 the dorsal is, as usual, the longer, and is, approximately, of the same length as 

 the lateral prostomial. Of tlie dorsal cirri the first is much longer than the 

 others, and is about the lengtli of the median tentacle or a little longer. The 

 rest are alternately longer and shorter: on the average tlieir length is about ('(lunl 

 to half the breadth of the body. 



Tlie ])arapodia are bilolinl, the poslerinr (d.irsal) lobe being the larger. 

 There are ten or twelve compound setae in each ])arapodium. These, which are 

 figured by Augener (Text-fig. 34), have short, unidentate f aloes. On the dorsal 

 .side of the compound setae in each parapodium there is, in all but the first 8 to IG 

 segments, a very fine capillary simple seta; no ventral simple setae were found. 



Capillary swimming setae are present in one of the male specimens from the 

 14th segment backwards, absent in the others. There is a single aciculum with a 

 .slightly knobbed extremity which is distinctly bent backwards. The ventral <-irri 

 are broad, ovate, shorter than the parapodia. 



The pharynx extends as far Ijack as the 6th segment; the proventriculus to 

 the 10th. The pharyngeal teeth are somewhat difficult of analysis. But tliere 

 seem to be six teeth and two jaw-pieces, two of the teeth being closely connected 

 with the latter, and the remaining four free between them. This is very near 

 what is described and figured by IMarenzcller [(42). Taf. iv., fig. 2D] for Odoiiio- 

 syllis virescens (O. ctenostoma). 



In the females, ovaries nccui' from the (ith or 7th segments backwards. In 

 the male, testes begin about the lith segment. A limited region, comprising the 

 11th to the 14th segments, is in mU lliiee specimens specially developed, with large 

 testes in the 13th and 14tli, and tlie body-cavities distended with ripe speniiatozoa 

 which are absent in the rest of the body. 



The specimens were found among Algae at AVatson's Bay, Port Jackson . 



Augener, on the strength of the enlarged eyes, compares his Q. detrcta with 

 (). hiialina (xrube; but there seems to be sufficient evidence to prove that the 

 teature in (|uestion is a sexual and not a specific character. Apart from this, the 

 affinities of 0. rletecta are much more with 0. ctenostoma, with Which Augener 

 makes no comparison . In faet, the only differences to be detected are the ab- 

 sence of the nuchal lobe, and also of the dorsal, simple, hooked setae, which, ac- 

 cording to Langerhans [(36). p. 55('). fig. l.'jrt. /i.l and St.-.Toseph [(47). p. .53, 

 177], occur on the more posterior jiarajiodia in the latter species. 



