Coughtrey.— Notes mi the New Zealand Hydroidea?. 287 



hydrothec* ; constricted between each pair of Iiydrotherce, and then swelling 

 gracefully out to support the next pair, giving the appearance of the lower 

 half of body of a vase and the constricted neck of pedestal supporting it. A 

 small cone-like projection can be seen through the clutine rising from each 

 constricted portion of the branch into centre of body of vase-like portion, 

 which supports the hydrothecai. 



Hydrothecae in pairs which are distant, opposite, synthecious, tubular, 

 smooth, curved outwards, mouth oblique so that the inner side is lowest, 

 bidentate, teeth acute and unequal in size, largest one external, smallest one 

 internal to the other and lateral. 



Gonosomic elements very distinct, one only to each hydrocaulis and 

 proximal in position, coming from hydrocaulis close to the most proximal pair 

 of hydrothecse subsessile, general form ovate, but flattened so that if looked at 

 in a certain position they have a narrower character than in another position. 

 Without a neck or crown, mouth entire but lips tumid. 



Allied to Synthecium elegans. 



Found on very delicate seaweeds after a severe storm on beach at Timaru, 

 also on Ocean Beach j but rare. (M.C.) 



Some are more gelatinous than others, and in a specimen I gathered on 

 the Ocean Beach, Dunedin, 22nd July, 1874, I noticed that the hydrothecse 



t differ 

 constr 



less 



separated. In this specimen also the 

 quite different to the one I first discovered on Timaru beach, having a bead- 

 like joint (see figs. 26 and 27) ; and the whole hydrophyton was of a more 

 delicate nature, so that there may be said to be two varieties of Synthecium 

 gracilis. 



I ought also to add that the hydrothecse in Timaru specimens are more 

 exsertile than those in Ocean Beach specimens. 



The typical characters of the hydrorhiza when magnified are well displayed 



in fig. 28. Figs. 26—31. 



Thuiaria 



" Hydrosoma variously branched. Hydrothecse biserial, adnate or imbed 

 in the substance of the stem and branches." 



Thuiaria sub-articulata, sp. nov. 



>hns 



Hydrophyton strong, erect, about four inches in height ; colour brown. 

 Hydrocaulis thick, pinnately branched, main branches radical or nearly so, 

 pinnae sub-opposite. 



Eachis and branches clothed with a fibrous network, fibres of which 

 spread from hydrorhyza and open out over the object to which the hydro- 



