HYDROZOA — RITCHIE. 86 t 



distinctly on the antei'ior of the stem, often only one on an 

 internode. For the sake of comparison, the conditions of a 

 hundred internodes of the two species were examined. In 

 Halicornaria 'prolifera, as represented in this collection of one 

 hundred internodes, ninety-nine bore a pair of hydroclades, one 

 bore a solitary hydroclade ; whereas in this species, reckoning 

 from the distal end of the colony, two had three hydroclades, 

 thirty-four a pair, while sixty-four had only a single indi\i(lual. 

 It also differs in the angle of its hydrotheca, and especially in 

 the open non-tubular condition of its lateral sarcothecse, and the- 

 similar condition, size, and relative position of the cauline sar- 

 cothecaB. The dimensions of the present species throughout ar& 

 much larger. 



Localities. — Station 44, off Coogee, five to six miles from 

 shore ; depth, 49 to 50 fathoms ; bottom, fine sand ; loth March, 

 1898 ; fragment. Station 48, off Wollongong, seven to eight 

 miles from shore ; depth, 55 to 56 fathoms ; bottom, sand and 

 mud to rock ; 18th March, 1898; two colonies. 



Type Specimens. — In the Australian Museum, Sydney. 



CLADOCARPUS (?) BATHYZONATUS,^" sp. nov. 

 (Plate Ixxxix., figs. 2, 6-11.) 



Station 57. 



Only two colonies of this species were found associated with 

 Sertidarella longitheca. 



Trophosome. — The habit of a colony is slight, for it coneists of 

 an unbranched sleuder stem up to 20 mm. in height, from the 

 distal portion of which a few short, delicate hydroclades project. 

 The stem is fascicled, the cladate tube being accompanied by a 

 very few accessory tubes for the greater portion of its length, all 

 the tubes forming, with their branches, a tangle of hydrorhiza 

 at the base. None of the fascicle shows a trace of nodes, but the 

 lower portion of the cladate tube, which for from 6 to 12 mm. is 

 destitute of hydroclades, is furnished with a linear series of 

 nematophores, twelve to fourteen in number. The distal portion 

 bears short alternate hydroclades, those on the same side being 

 separated by about 1 mm. Associated with the short projection 

 from the internode, on which the hydroclades rest, is only one 

 nematophore, which lies in tlie axil between its upper side and 

 the stem ; but in addition to this there occur on the anterior of 

 the stem 1)etween two hydroclades, one, or more usually, two, 

 cauline nematophores. The sarcothecse of those nematophoies 



^ ° ffddv^covos, long-waisted. 



