SheUs from the Falkland Islands. 219 



Alt. 27'5, (Jiam. niaj. 24 mm. 



Aperture : alt. 18, diam. 11"75 mm. 



Hab. Pwrfc Staiih-y, Falkland Islands {A. G. Bennett). 



The species would seem to be allied to Natica sohita, 

 Gould *, but difFejs from that species chiefly iti its more 

 exserted spire and longer whorls, more open umbilicus, and 

 less curved columella, 



Natica suhantarctica, sp. n. (Fig. 2.) 



Shell rather roundly ovate, moderately solid, white, covered 

 with a pale yelloMMsh-brown periostracum ; whorls 5, the last 

 two large in proportion to the remainder, thtj la.st ascending 

 in front, marked with transverse growth-lines crossed by 

 somewhat indistinct scratch-like strias ; suture incised; 

 umbilicus narrow, deep, partly filled by the thickened colu, 

 mella; columella white, porcellaiious, rather sharply curved 

 below where it is puckered into a series of short folds, very 

 obliquely descending above, outwardly thickened and re- 

 flexed, so as to partly fill up the umbilical cavity, and above 

 this extending into a minutely granular, moderately thick, 

 shining, well-defined, ])arietal callus, wliicli joins the upper 

 margin of the labrnm and just behind which it forms a 

 whiiish cal ous thickening; labruni acute; aperture rather 

 elongately subovate; ijiterior of shell white, 



Alt. 15, diam. maj. 13*25 mm. 



Aperture : alt. 9'25, diam. 6'5 mm. 



Hah. Falkland Islands {A. G. Bennett). 



Allied to N. patagonica, Phil.f, but considerably smaller, 

 much less openly umbilicate, and with proportionately 

 broader penultimute whorl ; moreover the columella in the 

 present species is much more oblique above and arched below 

 than is t!ie case with AT, patac/oni'ca, while the curious 

 puckering of the lower portion of the columella into short 

 folds is a character which should readily separate it fronj 

 that species. 



Pliotinula /^oh'dula, Cooper and Preston %, 

 var. depre.isa, var. ii. (Fig. 3.) 



Shell differing from the typical form in its mu:h greater 

 depres.-ion of spire, while retaining all ihe other ciiaracters of 

 the species. 



» Gould, Wilkes, U.S. Expl. Exp. 18-j6, pi. xv. fig. 257. 

 t Philippi, Abbild. ii. p. 41, pi. ii. ti?. 2. 

 t Ann. & Mag. Nat. Hist. 1910, v. pp. 111-112, pi. iv. flg. 3. 



15* 



