]\Ir. J. Alder on new British Zoophytes. 439 



Mr. Layard discovered it in danip mouldy amongst a pile of 

 loose rocks, iu a steep ravine, on the side of Table Mountain 

 overlooking Camp's Bay, and in company with the next species. 



Hydrocena Noticola, nobis, n. s. 



Testa subobtccte perforata, globoso-conica, laeiigata, nitidula, suc- 

 ciuea, peUucicla ; sj)ira conica, apice obtusiusculo, rubello, sutura 

 valde impressa ; anfractibus 4, convcxis, ultimo ventricoso ; 

 apertura vix obliqua, ovato-acuta ; peristomate tenui acute, callo 

 parietali, coluniellarique, appresso-reflexo, unibilicum fere tegente. 

 0])erculo uorniali, conieo, pellucido, paucispirato. 



Long. 2, diam. 1^ mill. 



Hub. cum praecedente. 



This is the first species of the genus which has been observed 



on the African continent. In its smoothness it presents a 



marked contrast to the Citra-gangetic species from the Khasya 



Hills and Burma. 



A Lymncea, a Planorbis, and a Unio (probably the shell found 

 by Rang in the Berg River, and nearly allied to tlie European 

 U.picturum), have been found by Mr. Layard, and will, with 

 some fluviatile shells taken by myself in the vicinity of Cape 

 Town, form the subject of a separate paper. , 



Cheltenbam, November /th, 1856. 



XXXVn. — Descriptions of three new British Zoophytes. 

 By Joshua Alder, Esq. 



[With a Plate.] 



I\ addition to the new zoophytes described in my former com- 

 munication to the 'Annals of Natural History,' I now beg to 

 offer an account of three others, extracted from a Catalogue of 

 the Zoophytes of Northumberland and Durham, about to appear 

 in the ' Transactions of the Tyneside Naturalists' Field Club.' 



Family Tubulariadje. 



Tubularia implexa, n. sp. 



Tubes small, very slender, generally more or less contorted 

 below ; smooth, wrinkled, or regularly annulatcd beneath a 

 smooth transparent epidermis; slightly and subunilaterally 

 branched, the branches going off nearly at right angles to 

 the stem, and a little constricted at their bases. Gregarious, 

 forming a densely tangled mass of |- to ;| of an inch in height. 



Discovered by Mr. R. Howse on an old anchor brought in by the 

 tishermen from ff)rty fathoms water, thiity miles off Holy Island. 



