SKENEA. 165 



the entire length of the shell. The peristome is con- 

 tinuous, and does not tightly clasp the preceding turn; 

 from the somewhat slanting position of the final whorl 

 in respect to the others, the anterior end of the aperture 

 projects beyond the general basal level. The throat is 

 smooth, and is not apparently nacreous. The pillar-lip 

 is erect, narrow, elongated, and not reflected ; it is much 

 arcuated, and forms one continuous sweeping curve with 

 the lower extremity of the acute and simple outer lip. 

 The larger of the individuals was not a line in diameter. 

 We doubt if these were quite mature ; some lamellar 

 wrinkles seemed to diverge in one of them from the um- 

 bilicus, and the lines of increase to become stronger and 

 more numerous towards the mouth. 



The species was discovered by Mr. Clark in the coralline 

 zone at Exmouth, and was named by him in honour of a 

 a lady distinguished for scientific attainments. 



S. ? L^vis, Philippi (?). 



Pure white, smooth, but with the mouth of the large umbilicus 

 spirally costellated. 



Plate LXXXVIII. fig. 5, 6. 

 Ddphinuhi IcBi'is, PiiiLiPPi, Moll. Sicil. vol. ii. p. 146, pi. 25, f . 2 ? 



This rare shell, of which we have only seen three ex- 

 amples, is intermediate in character between Margarita 

 pusilla and Skenea divisa. It closely resembles the figure 

 of the B. Ifcvis of Philippi, but the spiral lines, in our own 

 examples, do not extend beyond the mouth of the umbi- 

 licus; the colour is not brown, and there are not four 

 volutions. It is of a rather depressed orbicular shape, 

 with the anterior end of the aperture considerably below 



