Prof. Allman on the Hydroida. 9 



TuBiCLAVA, mihi, nov. gen. 



Polype clavlform, supported on the summit of free stems, 

 which rise at intervals from a creeping stolon, and are invested 

 by a chitinous polypary. Tentacula filiform, scattered. 



Gonophores dense clusters of sporosacs aggregated imme- 

 diately behind the posterior tentacula. 



T. lucema, mihi. 



Zoophyte about two lines in height ; stems quite simple, or 

 rarely with a short lateral branch ; polypary clothing the stem, 

 corrugated, dilated at the base of the polype, pale yellowish- 

 brown. Polype,y,'hen extended, about equal to the stem in height, 

 white, with pale ochreous centre ; tentacula about twenty, con- 

 fined to the anterior third of the polype. 



Creeping over the surface of loose stones in the bottom of a 

 rock-pool, Torquay. On stones between tide-marks, Dublin 

 Bay. 



In none of the Torquay specimens were gonophores present ; 

 but I do not hesitate to identify the present species with a Tu- 

 bularidan obtained several years ago in Dublin Bay, and which 

 I had carefully figured at the time, though I never published a 

 description of it. In the Dublin Bay specimens the gonophores 

 were present, and exactly resembled in structure and position 

 those of Clava multicornis. 



The genus Tubiclava dififers from Clava in the fact that the 

 polypes are no longer sessile upon the basal stolon, but borne 

 upon distinct branches enveloped by a polypary. This character, 

 taken in connexion with the form of the polypes, shows an affinity 

 also with Cordylophora, from which, however, it is separated by 

 the entirely different plan and position of the gonophores. 



Eudendrium humile, mihi. 



Zoophyte dehcate, rising to about | inch in height, much and 

 irregularly branched ; main stems and branches distinctly annu- 

 lated throughout. Polype yellowish-vermilion, vase-shaped, with 

 a circular groove near its base, and a trumpet-shaped proboscis ; 

 tentacula twenty or twenty-three, with the alternate ones elevated 

 and depressed in extension. 



Gonophores (male) surrounding the body of the polype, and 

 springing each by a short stalk from the circular gi-oove which 

 passes round the polype near its base, each gonophore consisting 

 of two superimposed chambers. Female gonophores consisting 

 of a single chamber, borne both by the base of the polype and 

 by the coenosarc immediately behind it. 



Rooted to the bottom of rock-pools near low-water spring- 

 tides, Torquay. 



