290 PEOCEEDTNGS OP THE MALA.COLOGICAL SOCIETY. 



a minute ectocone ; then follow five transitional teeth with hasal plates, 

 increasing in size, with small reflected portion and an aculeate 

 mesocone gradually becoming narrower. Finally, there are 19 true 

 marginals, having a small quadrate basal plate, to the inner side of 

 which is attached a long, aculeate mesocone with a short projection 

 above. 



This species is nearest to F. Hehnsi, Hutton, but has much more 

 remote costse and a wider umbilicus. From F. fulminata costata it 

 is distinguished by the more distant and sharp riblets, and the much 

 wider umbilicus. 



6. Paryphanta Edwaedi, n.sp. PL XV, Figs. 14, 15, 



Shell (Fig. 14) ^ large, subdiscoidal, umbilicated, brownish -black, 

 submembranaceous, shining ; spire low, broadly conoidal ; whorls 3^, 

 rapidly increasing, flatly convex ; protoconch of 1^ whorls, almost 

 smooth, but faintly radiately striated, light brown, the following whorl 

 darker, malleated, the last whorl somewhat irregularly obliquely 

 plaited in the direction of the growth-lines, crossed at right angles by 

 more or less distinct shallow furrows ; suture impressed ; aperture 

 oblique, oval, but little excavated by the penultimate whorl, shining 

 within, and of a dark bluish tint, peristome thickened by the over- 

 lapping epidermis, columellar lip oblique, but very little expanded 

 above, extremities converging, united by a very thin callosity on the 

 penultimate whorl. Umbilicus pervious, moderate, deep, about •§- of 

 the minor diameter. Base smoother than the upper surface and more 

 shining, convex. Diam. maj. 30, min 25 mm. ; alt. 20 mm. 



Hal. — Hossack Downs, Canterbury, where it was found by my son, 

 in whose honour the species is named. 



Type in my collection. 



This species stands nearest to P. atramentaria, Shuttl., from 

 Victoria, but is at once distinguished from it by the much more 

 rapidly increasing whorls, the last occupying nearly f of the greater 

 diameter, and by its wider umbilicus. 



Radula (Fig. 15) has the formula 26 : 1 : 26. The aculeate teeth 

 increase in size from the centre to the margin, except the last one, 

 which is smaller. The rhachidian tooth is short and with straight 

 sides, the five following teeth are similar but longer, they then take 

 on a more and more triangular shape. 



The radula of P. atramentaria has the formula 50 : 1 : 50, the 

 teeth increasing in size from the middle to about the 15th, thence 

 getting slowly shorter towards the margins. 



The only specimen I have contained the dried-up animal, thus 

 enabling me to prepare the radula, but leaving no chance for 

 examining the reproductive organs. 



1 For the photographs I am indebted to Capt. F. "W. Hutton, F.R.S., etc., and 

 they were taken by Mr. "W. Sparkes, taxidermist in the Canterbury Museum. 



