Mr. W. Clark on two new species of Testaceous Mollusca. 425 



be the Helix serpuloides of Montagu, at present involved in some 

 obscurity, but the completely striated condition of the volutions 

 forbids this idea. From Skenea divisa, which by some concho- 

 logists is considered synonymous with the Helix serpuloides of 

 Montagu, it differs in its much more globular form, and in the 

 volutions being distinctly striated throughout ; it cannot for a 

 moment be confounded with the recently discovered Margarita 

 pusilla. As the animal and operculum of this new species have 

 not been observed, it may be either a Margarita or an Adeorbis, 

 or be referable to the Skenea, or to the so-called Trochus subca- 

 rinatus. I prefer to place it, ad interim, with the Skenece, as the 

 principal characters of that small group, though artificial, con- 

 sist in the aperture being suborbicular, and with an entirety 

 scarcely interrupted by the very short and small canal at its up- 

 per part ; for these reasons I consider the Margarita pusilla and 

 the Trochus subcarinatus to be Skenece or Adeorbes, or whatever 

 other appellation may be applied to them. The Trochidce have 

 an invariable angularity in the aperture, which in them, as well as 

 in Margarita, is never entire, and has no trace of a canal. I do 

 not know the Adeorbis ; it is I believe a genus of the Trochidce ; 

 if it partakes at all in the angular form of the aperture of that 

 family, it has no connection with the present species. 



The Margarita vulgaris, M. pusilla, Skenea divisa, S. depressa, 

 S. bicolor, have light corneous opercula, of three or four lax vo- 

 lutions, which have nothing of the aspect of the numerous, com- 

 pact and close-set ones of the Trochidce. 



I have done myself the honour to attach to this new and ele- 

 gant object the name of a lady residing at Budleigh- Salterton, 

 Devon, whose services in the various walks of natural history 

 have been of great value : her retiring disposition would have 

 declined, if she had known it, even this small tribute of consi- 

 deration, and mention of qualifications of no ordinary stamp. 



Fusus Branscombi. 

 F. testa elongata, pallide lutea, anfractibus octo repente attenuatis ; 

 varicibus validis novem striis spiraiibus coni'ertis perspicue cselata ; 

 sutura simplici ; apertura subovalis, in canalem branchialem sub- 

 rectam producta, superne vix emarginata ; animal ignotum ; oper- 

 culum ? Longitudo f , latitudo ^ uncise. 



This species as to novelty rests on the same grounds as the 

 Skenea Cutle?'iana : I am at a loss to liken it to any congeneric 

 species. 



I name it Fusus Branscombi, as a memorial of the thirty years' 

 services of my dredger, Wm. Branscomb, a very honest man, a ab- 

 normis sapiens," ft of mother wit, and wise without the schools." 

 I am, Gentlemen, your most obedient servant, 



William Clark. 



