'**' Mr. J. Alder on new British Zoophytes. 439 



Mr. Layard discovered it in damp mould, amongst a pile of 

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

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



Hydrocena Noticohj nobis, n. s. 



Testa subobteete perforata, globoso-conica, laevigata, nitidula, suc- 

 cinea^ pellucida ; spira conica, apice obtusiusculo, rubello, sutura 

 valde impressa ; anfractibus 4, convexis, ultimo ventricoso ; 

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

 parietali, columellarique, appresso-reflexo, umbiUcum fere tegente. 

 Operculo normali, corneo, pellucido, paucispirato. 



Long. 2, diam. 1^ mill. 



Hab. cum prsecedente. 



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 Lymn(£a, a Planorhis, and a Unio (probably the shell found 

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

 XJ.pictorum), 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. 



Cheltenham, November 7th, 1856. ' ^^^^^[ ^i?^« »f^^ l}i^^^ ' 



1 J if:)ffiw 



XXXVIL — Descriptions of three new British Zoophytes. 

 By Joshua Alder, Esq. 



[With a Plate.] ', ^.^,,^ ^^j. ^.^^; 



In 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 Tubulariadae. 



Tubularia implexa, n. sp. /lOflqriaq 



Tubes small, very slender, generally more or less contorted 

 below ; smooth, wrinkled, or regularly annulated 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 

 fishermen from forty fathoms water, thirty miles off Holy Island. 



