Rev. T. Hincks on new species of British Zoophjtes. 127 



are clustered together in pairs. The anus is a large, transversely 

 oblong opening, placed immediately beneath the posterior mar- 

 gin ; from it to the mouth an elevated ridge of the test runs : the 

 single interambulacrum is slightly produced posteriorly where 

 the anus teminates : the tubercles are larger, and placed at 

 greater intervals apart on the base than on the dorsal surface : 

 the marginal fold of the test forms an acute angle, and on the 

 border thereof the tubercles are clustered closer together in 

 greater numbers, with smaller interspaces between them, than in 

 any other part of the skeleton. 



Affinities and differences, — This species very much resembles 

 in form and size C. conoidetts, but it is readily distinguished from 

 it by the following characters : the ambulacral areas are smaller, 

 the poriferous zones are narrower, and the outer and inner pores 

 of each pair are nearly of the same size, whilst the septas between 

 the pores are thicker; the dorsal surface is not so much ele- 

 vated, the base is concave, the anus is large and transversely 

 oblong, and the mouth possesses very prominent oral lobes. 



Locality and stratigraphical range. — This Urchin was collected 

 at Malta, from bed No. 2. The fine specimen before us belongs 

 to the Bristol Institution ; we possess one, through the kindness 

 of M. Michelin, from the celebrated Urchin bed of Balistro (Cor- 

 sica) ; it is found likewise in the " Molasse du Cap Couronne pres 

 Martigues.^^ {Michelin.) 



[To be continued.] 



XIII. — Notes on British Zoophytes, with descriptions of new 

 species. By the Rev. Thomas Hincks, B.A. 



[With two Plates.] 



New species of Sertularia. 



The beautiful form which I am about to describe has hitherto 

 been found, so far as I am aware, only in the Shetland seas. 

 Two specimens in fine condition, and fortunately laden with 

 vesicles, were obtained by Miss Cutler amongst the refuse of 

 Mr. Barkers dredge. To her great liberality I am indebted for 

 one of these specimens (as for many other interesting zoophytes), 

 and for the opportunity of presenting a figure and description of 

 the species to the readers of the ^ Annals.^ 



Genus Sertularia. 



S. alata (Hincks). 



Pinnate, blackish-brown, highly varnished ; pinna winged ; 

 cells opposite, adherent below, the upper part suddenly divergent. 



