88 ADDITIONS TO IHB tasMaNIAN makine UOLLUSCA, 



M. tasmanica, with which species it lias much affinity, 

 but differs in the distinct ribbing, the contour of the lip, 

 and the very much greater size. M. Uumanica is very 

 constant in size and shape, and always smooth. M. fot- 

 m ic ul a is a very much broader shell, with far stronger ribs. 

 M . georgiana, May, is much smaller, of a thin, transparent 

 texture, and the ribs do not reach to the suture. 



MARGINELLA GEORGIANA, Sp. Nov. 



Shell elongate, narrow, with a well developed spire, 

 colour yellowish-white, apex blunt and rounded ; whorls 3, 

 hollowed above ; smooth at first, but small, wrinkle-like 

 ribs develop and become more prominent on the body 

 whorl ; they extend from the shoulder, and fade awav 

 before reaching the centre of the body whorl. Aperture 

 narrow above, widening rapidly towards the front; outer 

 lip sinuous, moderately thickened, unarmed Columella 

 excavate, and bearing four ascending plaits, the upper 

 three being much the stronger. 



Length 7. Breadth 3.5 mill. 



Type, with three others, from 15 fathoms, near George 

 III. Reef, below Southport. 



This is a near relative to M. formicula, Lamk., but it 

 is much naiTower, with a longer spire, much less strongly 

 ribbed, and of a thin, delicate texture. My experience 

 of M. formicula shows it to be a strictly littoral species, 

 living between tide marks, whilst this form was from 

 fairly deep water. 



PI. III., fig. 13. 



MARGINELLA CADUCOCINCTA, Sp. Nov. 



Shell very small, obtusely pyriform, with a moderiulv 

 elevated sharp spire. White, with three pale chestnut 

 bands. Whorls three; the body whorl very broad-shoul- 

 dered, gradually decreasing to the nariow base. Aper- 

 ture narrow above, widening towards the front. Outer 

 lip thick, solid, and smooth. Columella bearing four 

 strong plaits. The first colour band is at the suture, the 

 third at the upper plication, and the other intermediate. 

 They are indistinct, often scarcely discernible, and very 

 frequently the shcTT is pure white. 



Length 3. Breadth 2 mill. 



Although considerably resembling several others, I can- 

 not place it with any described species known to me. 



Type, with about two hundred others, from 40 fathoms, 

 off Thouin Bay. 



PI. II., fig. 11. 



