with Observations on Australian Hydroids. 93 



Sertularia loculosa, Bush, 



I have described this species in the " Catalogue" as being 

 occasionally pinnate, but have nowno doubt that the supposed 

 pinnate specimens belong to a different species — namely, the 

 S. Australis of Kirchenpauer. So far as is known at present, 

 S. loculosa has only occurred in the simple form. 



Sertularia Australis, Kirchenpauer. 



Some specimens of a Sertularian which I received from 

 Mr. Maplestone, and considered a pinnate form of iS'. loculosa, 

 are, I believe, to be referred to the above species. By com- 

 paring the figure of a variety of >S^. loculosa which is given in 

 the '' Catalogue" (Plate IV., fig. 6) with that of S. Austrcdis 

 (Plate VIII., fig. 7), it will be seen that tliere is no noticeable 

 diflference in the form of the hydrothecse; but specimens of 

 the latter species which I have since collected at Williams- 

 town have hydro thecge which are almost entirely without 

 the abrupt bend in the middle, and are provided with 

 shorter teeth. The species is evidently a close ally of 

 <S^. diver gens and S. tenuis, from which it diflfers mainly in 

 the larger and stouter internodes and hydrotheca?. As in. 

 those species, the internodes are comparatively wide below 

 the hydrothec^, and slender and elongated above, with 

 slender joints. Though the species is usually pinnate,, 

 specimens of simple habit are occasionally met with. 



Sertularella Johnstoni, Gray, sp. 



Under this name I have included two rather distinct 

 forms — one (from New Zealand) with the hy drothecee some- 

 what narrowed towards the aperture, or sub- conical, and with 

 the gonangia narrow in proportion to their length, and with 

 about fourteen annulations; the other, common in Bass' 

 Straits, rather stouter, with tubular hydrothecse, and the 

 gonangia larger, proportionally broader, and with not more 

 than about eight annulations. Dr. Kirchenpauer considers 

 that in the type form the long, closely-ringed gonangia are 

 associated with completely tubular hydrothecas, and he 

 describes as a new species {S. purpurea) a form which differs 

 little, if at all, from the New Zealand one mentioned above, 

 the free part of the hydrothec^e being, perhaps, slightly 

 shorter. Professor Allman, however, describes the hydro theco3 

 of >S^. Johnstoni as being slightly narrowed towards the 



