TUBULARIID^E. 



rooted by a filiform stolon, the whole clothed by a polypary ; 

 polypites flask-shaped, with filiform tentacles in two verticils 

 the oral short, surrounding a conical proboscis, the aboral 

 long, near the base of the body ; gonophores developed in 

 clusters on the body of the polypite between the circles of 

 tentacles, containing free medusiform zooids. 



Gonozooid : Umbrella (at the time of liberation] nearly 

 spherical (slightly flattened at the two poles) , traversed by 

 prominent longitudinal ribs formed of series of thread-cells ; 

 manubrium with a simple mouth, shorter than the bell; 

 radiating canals 4 ; marginal tentacles 4, without ocelli at 

 the base. 



E. DUMORTIERII, Van Bencden. 



TUBULARIA DUMORTJEUII, Van Bcneden, Mem. sur les Tubul. f>0, pi. ii. ; 



Johnston, B. Z. pi. vii. figs. 1, 2 (not the species described in 



the text). 

 ECTOPLEURA DUMORTIERII, Agassiz, N. H. U. S. iv. 342. 



Plate XXI. fig. 4. 



STEMS about half an inch in height, scattered, simple (or 

 occasionally very slightly branched), slender, of a pale 

 horn-colour, attenuated and annulated at the base; 

 POLYPITES proportionally large, rose-coloured ; oral ten- 

 tacles short, in two series, numbering about 24 ; lower 

 tentacles about 30, of moderate length; GONOPHORES 

 spherical, borne on short, branched peduncles. 



GrONozooiD. UMBRELLA (at the time of liberation) melon- 

 shaped, traversed by eight longitudinal ribs ; MANUBRIUM 

 reddish; MARGINAL TENTACLES set at intervals with clus- 

 ters of thread-cells. 



THE Tubularia Dumortierii of Johnston is not the zoophyte 

 that had been previously described by Van Beneden under 

 this name, but another species, which has been distinguished 

 and characterized by Alder as T. simplex. 



Prof. Wyville Thomson has recorded the occurrence of 



