Dr. ]\J. Cough trey o/i New-Zealand Hydroida. 29 



has an appearance not unlike the crest of Camji. calceolifera^ 

 Hincks (Ann. & Mag. Nat. Hist, ser, 4, vol. viii. p. 78). It 

 never attains a greater height than 2 inches. 



Sertularia pumUa (sp. nov. to N. 7A.) = Synthecium gracilis ^ 

 mihi, he, cit. p. 286, pi. xx. figs. 26-31. 



I am now perfectly satisfied that I was in error when I 

 placed this species under Allman's genus Syntheciuni. I have 

 carefully compared it with varieties of >S*. pmnila from the 

 Mersey (Britain) and elsewhere, and cannot detect sufficient 

 specific characters for a new species. 



The differences I observed in the New-Zealand specimens 

 (as shown in loc. cit. pi. xx. figs. 26 & 27, both magnified to 

 same extent) are present in British s])ecimens ; and one cha- 

 racter has been observed by Dr. Mcintosh in St.-Andrews 

 specimens, namely presence or absence of joint in the stem 

 (Ann. & Mag. Nat. Hist. ser. 4, vol. xiii. p. 212). 



Sertularia elegans. 

 Synthecivm elegans, Allman (Gymnoblastic Hydroids). 



Another small specimen has enabled me to confirm my 

 previous identification of this species. It is equally pygmy 

 in size with my first one, and in one of the calycles has 

 the lower three fourths of the peculiar ovarian capsule de- 

 scribed by Prof. Allman. Vide Trans. N.Z. Inst. vol. vii. 

 pi. XX. fig. 25*. 



Genus Hydrallmania. 

 HydraUmania'i hicalycula^ sp. nov. Pi. III. figs. 8, 8', 8'", 9. 



I place this specimen provisionally under the above genus ; 

 but the generic characters would have to be remodelled to 

 admit it. I do not think it can be the Sertularia unilateralis 



* Sertularia ? I lately obtained from the Bluff ITarbour, just 



below low-water mark, a little specimen resembling in many points 

 S. pumila, but which I am undecided where to place. The shoots spring 

 from a filiform hydrorhiza. Stems straight, very much thicker than 



f»innse ; pinnately branched, pinnae subopposite. Pinnae arise by a pecu- 

 iar joint from stem, like as in PI. III. iigs. 7, 7', 7", & 7'", Hydrothecae 

 opposite, crowded, ensheathing the axis, so that scarcely any interspace 

 is observed between those on the pinnje, while a large interspace is 

 observable between tliose on the stems ; hydrothecae short and stout, 

 to(jth('d and operculated ; a small joint between each pair of hydrothecao. 

 Vide PI. III. fijr. 7. 



