280 Rev. T. Hincks on new Australian Hydrozoa. 



Subkingdom CCELENTERATA. 



Class HYDROZOA. 



Order SERTULARID^. Family Campanulariadae. 



Genus Campanularia. 



C. tinda, Hincks, n. sp. (PI. XII.) 



Creeping stem plain, forming a coarse network. Cells calicu- 

 late, elongate, slightly expanded above, with nine or ten pointed 

 crenations on the margin : pedicles with a single small spherule 

 at the top, immediately beneath which they widen, and usually 

 exhibit one or two somewhat square segments ; throughout 

 the remainder of their length they are either smooth or very 

 obscurely annulated. Gonothecse large, of a dark horn-colour, 

 recumbent, subcordate, attached by a short stalk, which springs 

 from a notch at the base; upper surface ribbed transversely, 

 flattened and smooth beneath ; orifice terminal. 



Hab. Australia; Laminarian zone, on Cymodocea antardica, 

 Hooker. 



The pedicles in C. tinda are of variable length, but generally 

 short. The lower portion of the cell is contracted ; and within 

 it there is, I believe, a spherical ring, as in C. Hincksii. The 

 large and recumbent capsules constitute a marked and distinctive 

 feature of this species. 



LiNEOLARiA, Hincks, nov. gen. 



Polypary corneous, adherent, filiform, branching; branches 

 given oflF at right angles (or nearly so) to the main stems. 

 Cells adnate, attached to the stem at the base ; orifice terminal, 

 Gonothecse very large, adherent, originating at the base of a cell. 



L. spinulosa, Hincks, n. sp. (PI. XIII.) 



Creeping stem running in straight lines, with occasional 

 branches. Cells oblong, alternate; orifice subtriangular, with 

 an ear-like projection on each side ; a curved spine at the lower 

 extremity of the cell. Gonothecse about three times the size of 

 the cells, ovate, tapering towards the point of attachment, — a 

 row of strong spines running down each side and meeting below, 

 enclosing an area which is flattened and transversely furrowed 

 and supplied with a few scattered spines ; orifice terminal, sub- 

 circular, slightly marginate. 



Hab. Australia; Laminarian zone, on Cymodocea antardica, 

 Hooker. 



Both the species now described are parasitical on the leaves of 



