224 PROF. "w". A. HASWE1L : 



majority of specimens, of the frontal eyes, and the greater size of the 

 proventrieulus. 



Auaener's fig. 31, though it doubtless represents his material accurately, 

 does not correctly represent the head-end as it appears in living or well-fixed 

 specimens, and I give here a new figure as well as one of the parapodium 

 and the setse. 



The two species here referred to as G. kerguelensis and G. quadrioculata 

 do not differ very widely from one another. The latter is a larger and more 

 robust form than the former, has a comparatively large proventrieulus, and 

 usually only four eyes. But six eyes are present in a considerable proportion 

 of cases. 



SPHiEEOSYLLis hystrix, Claparede. (Plate 18. figs. 32-35.) 

 Sphcerosyllis hystrix, Claparede, 3, p. 45, Taf. 13. tigs. 36, 37. 

 Sphcerosyllis hystrix, Marenzeller, 23, p. 25. 



Sphcerosyllis hystrix, Mcintosh, 21, p. 156, pi. 59. figs. 3, 4, 8 ; pi. 70. fig. 1 ; pi. 78. 

 figs. 11-13. 



Tn describing S. pirifera (Ann. diet.) Claparede refers to a few points of 

 difference from S. hystrix previously described by him. The cirri and 

 tentacles he states are relatively shorter and more dilated at the base and 

 always curved or hooked at the ends. Marion and Bobrelzky (24) regard 

 S. hystrix and S pirifera as identical or at least not specifically distinct. The 

 nearness of the two forms is emphasized by De St. Joseph. The distinctive 

 character, he states, is the existence of the " glandes a batonnets " in 

 S. hystrix. 



A Sphcerosyllis which is extremely common in Port Jackson conforms 

 closely to Claparede' s account of S. pirifera as supplemented by Viguier (Arch, 

 de Zuol. exp. et gen., 2 ser., tome ii. (1884)). But it possesses the "glandes 

 a batonnets," and should thus, by De St. Joseph's interpretation, be assigned 

 to the "older species. This, however, is contradicted by De St. Joseph's 

 statement that in the latter the yellow glands are absent. Moreover Viguier 

 states that S. hystrix remains always transparent and does not become 

 encrusted with foreign bodies. 



As the Port Jackson form, like the specimens collected by Pierantoni in 

 the Gulf of Naples, frequently possesses both the rhabdite glands and the 

 yellow glands, I have followed the last-named author in his conclusion that 

 the presence of (he structures in question or their apparent absence is not to 

 be relied on as a specific distinction. I am inclined to believe that both sets 

 of structures are present in all <S. hystrix and 6'. pirifera specimens, but that 

 one or orher, owing to its physiological or developmental condition, may 

 sometimes not be readily recognizable. As the Australian specimens differ 

 in some minor points from the published descriptions, I think it desirable to 

 describe and figure this common Australian form pretty fully, while still 

 retaining for it for the present the name of S. hystrix. 



