JoURiVAL OF CONCHOLOGY. 2§I 



HELIX PISANA var. TENUIS, A NEW VARIETY 

 FROM TENBY. 



By JOHN W. TAYLOR, F.L.S., 



Membre Honoraire de la Soci^td Malacologique de France, &c. 

 (Read before the Conchological Society, Dec. loth, iSgo). 



Amongst some specimens of IIe//x pisana, found at Tenby 

 during the past summer and kindly sent to me for examination 

 by Mr. J. W. Storey, B.A., of Cardiff, was one which differed so 

 remarkably from any I liave before seen that I have appUed to 

 it the name tenuis, aiming thereby to express its thinness and 

 translucency. The type shell, which has been generously pre- 

 sented to me by Mr. Storey, may be described as of an almost 

 uniformly translucent horn colour, somewhat resembling Zonites 

 nitidulus in colour and consistency; the pillar is visible through 

 the shell by reflected light, and by transmitted light the wiiole 

 shell seems almost colourless and very transparent; towards the 

 mouth — which shows no trace of its usual pinkiness — there is 

 some approach to a whitish opacity, in which traces of two 

 translucent bands are faintly visible in the positions occupied by 

 the first and third bands in the Pentatccnia. The nucleus is of 

 the same horny texture and aspect as the rest of the shell, and 

 is not of the blackish tint as is usual in this species. The speci- 

 men is 16 mills, in diameter, weighs 3^ grains, and is altogether 

 so very unusual in appearance and so different in its general 

 character from ordinary individuals that I venture to think it would 

 not on a cursory examination be referred to the present species 

 by even experienced conchologists. 



Another variety from the same locality sent me by Miss 

 F. M. Hele is worthy of remark, as simulating by its depressed 

 form and general aspect the dull-white unicolorous variety of 

 Helix eticetorum. I have not yet been able to ascertain whether 

 this deviation from the normal form has received a distinctive 

 name. 



