HYDROID ZOOPHYTES COLLECTED BY DR WILLEY IN THE SOUTHERN SEAS. 453 



Family. Campanulariiuae, Hincks. 

 Genus. Obelia, Peron et Lesueur. 



Obelia linearis, n. sp., PI. XLIV. Fig. 6. 



There are only two little rooted specimens of this species, 7 mm. in height. The 

 stem is simple, horn-coloured below, transparent above, and is branched (see Fig. G). 



The h3-drothecae are deep, their margins have about twelve blunted teeth around 

 them. There are usually longitudinal lines to be seen on the hydrothecae, the result 

 probably of the collapsing of their delicate sides. 



The gonothecae are borne in the axils of the peduncles, they are elongate oval, 

 smooth, and with a prominent rim to the orifice. 



The gonozooids seen within the gonothecae show signs of tentacles in those that 

 are uppermost in the gonothecae. 



Locality. Blanche Bay, New Britain. 



Obelia delicatula, n. sp., PI. XLIV. Fig. 7. 



This is a smaller, more delicate form than the last, and unbrauched, but the 

 hydrothecae and gonothecae are much the same in their characters. 



The stem reaches 4 mm. in height, borne on a creeping stolon, which carries the 

 gonothecae also. 



The stems are ringed at their bases, and here and there above, and are also several 

 times ringed under the hydrothecae (Fig. 7). The whole colony lias much the appear- 

 ance of Campamdariu phi/coci/uthus, Allman', but the zooids in the gonothecae show the 

 budding tentacles of the free swimming medusoid, showing that it does not belong to 

 that genus. 



Locality. Blanche Bay, New Britain, 40 fathoms. 



Obelia serrulata, Bale (sp.), PI. XLIV. Fig. 5. 



The large.st piece among the fragments collected of this species is a little over 1 cm. 

 in height. It is branched and has a strong compound stem formed by the downward 

 growth of stolons from the peduncles of the hydrothecae. 



The hydrothecae are very broad above, tapering downwards towards the base. The 

 floor is raised above the base so as to leave a large cavity beneath it, and this 

 character, together with that of the marginal teeth, agrees with Mr Bales'- description 

 of Gampanularia ? serrulata, Bale, found at Port Jackson. His specimens were delicate, 

 and there being no gonothecae present makes it appear likely that they were immature. 



The gonotheca of the present species is oval, truncated above, and borne on the 

 stem, and contains zooids with budding tentacles (Fig. 5). 



Locality. Blanche Bay, New Britain : from ropes and fish-baskets in 40 fathoms. 



1 Voyage of H.M.S. CliaUeuger, Report on llie Ilijtlroiiin, Pt ii. 

 '•' Proc. Linn. Soc. Neic South U'ulex, Vol. in. 1888, p. 7J7. 



w. IV. 61 



