132 PEOr. ALLMAN OK NEW HTDEOIDA PEOM 



Description of Australian, Cape, and other Hydroida, mostly 

 new, from the Collection of Miss H. G-atty. By Professor 

 Geoege J. Allman, LL.D., F.E.S., P.L.S, 



[Read 19th March, 1885.] 

 (Plates VII.-XXVI.) 

 A LAEGE collection of Hydroida has been placed in my hands 

 by Miss Gratty for determination and description. It consists 

 mainly of species hitherto undescribed. The specimens have 

 been brought together from various parts of the world ; and 

 though they are all dry, they are for the most part well pre- 

 served, and the features of most importance in the definition 

 and systematic distribution of the species were generally deter- 

 mined with ease from the chitinous periderm, after this had been 

 subjected to such treatment as would render obvious its essential 

 morphological characters. 



No record had been keep as to the depths from which the 

 specimens had been obtained, but it is probable that they are all 

 from the littoral region. 



In order to convey an adequate idea of its habit, every species 

 has been figured of the size of life, while such microscopical details 

 as are necessary for a complete diagnosis are in all cases given.* 



Campanulaeia. 



Campakulaeia caedtjella, n. sp. (PL Til. figs. 1, 2.) 



Trophosome. — Hydrostyles about ^V °f ^^ ^'-'*^^ ^^ height, 

 springing at short intervals from a creeping stolon and annulated 

 at the distal end. Hydrothecge cup-shaped, with tumid base and 

 everted lip. 



Gonosome. — Gonangia springing from the creeping stolon, 

 large, oviform, with truncated summit, and with the proximal 

 end continued into a short but well-defined peduncle. 



Locality. New Zealand. 



This very minute Campanularian is rendered striking by its 

 peculiarly shaped hydrothecae, whose outline, somewhat resem- 

 bling that of a thistle-head, has suggested the specific name. 

 Wliile most of the hydrostyles spring directly from the creeping 

 stolon, some may be seen arising from loops formed by short free 

 branches of the stolon curved upon themselves. 



The nature of the contents of the gonangia being indeter- 



* For the drawings which represent the natural size of the species I am 

 indebted in almost every instance to the accurate and delicate pencil of Miss 

 Hippisley. 



