THE E&OGONEj*. 219 



curved rods without serrations or teeth. Sexually ripe individuals have in 

 addition bundles of long capillary natatory setae on the dorsal side of the 

 parapodia of most of the segments. As in other Syllids, the setigerous sac 

 in which new setae are developed is quite separate from the bundle of mature 

 setae, and attached firmly to the aciculum ou its dorsal side. 



The dorsal cirri are greatly reduced, shorter than the parapodia, oval or 

 spherical in shape. The second segment is always devoid of dorsal cirri. 

 The ventral cirri are also rudimentary, but more cylindrical in form. The 

 anal cirri are longer than the parapodia, slender and cylindrical, not swollen 

 at the ends. 



In the retracted condition of the proboscis the pharynx runs through the 

 first three segments, the proventriculus lies in the fourth and fifth, and the 

 ventriculus and caeca are situated in the sixth. 



Exogone fvstif era is hy far the commonest of the Port Jackson Exoqonece, 

 and occurs abundantly among finely branched Algae of all kinds about low- 

 water mark. I also found it in Broken Bay among Algae and Sponges orowino- 

 on the piles of a wharf ; and in material collected at Port Stephens by 

 Prof. S. J. Johnston. 



Viguier (34) * identifies the species of Exogone which he found most 

 abundant in the Bay of Algiers with that observed by Pagenstecher (26) 

 at Cette, and named by him E. gemmifera. Viguier was not in any doubt on 

 this point. He writes : — " C'est bien le type etudie par cet auteur que j'ai 

 pu observer a mon tour." But a comparison of the descriptions and figures 

 of the two authors leaves some doubt of the correctness of the identification. 

 Viguier states with regard to the tentacles : "Elles sont legeremenfc renflees 

 un peu au-dessous de leur base, et decroissent jusqu'au sommet, qui est arrondi 

 et muni de quelques petites soies raides " (p. 77); while Pagenstecher refers 

 to the same appendages as " nur wenig Kolbig anschwellende Fabler," and 

 Ids figure represents them as distinctly swollen at the ends. I think it 

 probable that Pagenstecher's E. gemmifera is (Ersted's E. naiidina (25) and 

 that Viguier's E. gemmifera (Pagenstecher), though identical with Olaparede's 

 E. clavigera, as Viguier himself maintains, is not Pagenstecher's species. 



Should this suggestion prove to be correct, it would be to E. naidina 

 (CErsted) that E. fustifera would most closely approximate rather than to 

 E. clavigera (Claparede). 



Exogone verrugera, Claparede. (Plate 17. figs. 7-10.) 

 Padophylax veruger, Claparede, 2, p. 213, pi. 12. tig. 3. 



A second species of Exogone occurring in Port Jackson is nearly related to 

 Claparcde's Pcedopliylax verrugera from the Gulf of Naples. Like the pre- 

 ceding it is a small form, and does not exceed. 7 mm. in length. There are 

 about 37-40 segments. 



* The thick figures refer to the Bibliography at the end. 



