256 ZOOPHYTOLOGY. 



slender cylindrical branches. Its description and representation are 

 reserved for a future occasion. 



Sub-order II. Cyclgstomata. 

 Fam. TuBULiPORiDiE. 



1. Gen. Tubulipora, Lamk. 



1. T. ventricosa, n. sp. PI. II., fig. 3, 4. 



Polyzoarium sub-erect or recumbent attached by a contracted stem, 

 which rapidly expands above into a hollow calcareous vesicle, from which 

 the tubes project irregularly and of various lengths. 



Hab. W. Greenland {ut supra). On fucus. Br. Sutherland. 



Some of the simple forms of 2\ serpens, or flahellaris, might on occasion 

 perhaps be confounded with the present species ; but it nevertheless, from 

 comparison of several specimens, appears to me to be quite distinct. 

 The polyzoary, which, though recumbent, is usually wholly unattached 

 above, is about l-8th of an inch in length. It arises by a contracted por- 

 tion or stem, which is usually more or less curved or contorted ; and 

 speedily expands into a wide ventricose dilatation, in which the upper 

 tubes are immersed for a considerable part of their length. The tubes 

 project irregularly from all parts of the exposed aspect of the polyzoary, 

 and are themselves smooth or faintly ringed with lines of growth, whilst 

 the surface of the vesicular dilatation, which doubtless corresponds with 

 an ovicell, is finely punctate. AVhen perfect the orifice of the tubes 

 exhibits a tooth-like projection on one or two sides. 



2. Gen. Discopora, Fleming. PI. III., fig. 1. 

 1. D. ciliata, n. sp. 



Orifice of tubes furnished with numerous slender si^ines. 



Hab. Assistance Bay and W. Greenland. On fucus. Dr. Sutherland. 



The figure of this minute species will be given in a subsequent plate. 

 It bears a remote resemblance to Discoixn-a Jnsjnda (Tubulip)ora Mspida, 

 Johnst.), but differs in the numerous slender spines with which the orifice 

 of the tubes is furnished. 



Class. HYDROZOA. 

 Fam. Sebtulariad^. 



Gen. 1. Sertularia, Linn. 



1. S. polyzonias 1 PI. II., fig. 5, 6. 

 Hab. Greenland. Peach. 



From the small specimen thus characterized, and which is unfurnished 

 with the ovicell, it would appear that this cosmopolite species extends 

 even into the Arctic circle. It s^cms to abound in all parts of the world, 



2. F. imhricata, n. sp. PI. II., fig. 7, 8. 



Cells sub-opposite, very close, urceolate, wide and deeply immersed 

 below ; contracted and free for a short distance above ; margin of mouth 

 slightly raised on each side. Polypidom simply pinnate ; pinn£e sometimes 

 forked, long and drooping. Ovicell ? 



Hab. Greenland. Peach. 



I am unable to reconcile this form with any other, and therefore ventui'e 

 to give it the above designation. 



