NATICA PUNCTURA. 79 



Cornbrasli are anywhere forthcoming. A small specimen in my collection from 

 Bothenhampton might do very well for it, but it is only a young cast, and might do 

 as well for the young of N. chauviniana. For N. punctura see below. N. texata is 

 quoted by Beeby Thompson from Stow-nine-Churches. No doubt it is that species, 

 but that species is the same as N. montreuilensis. The resemblance of the two is 

 noticed by Lycett, but he says the latter " is less depressed and the aperture more 

 lengthened," but in measuring them together I can find no difference between them 

 (see p. 80). 



The records of Neritopsis must be taken with those of Natica. They all three 

 refer practically to one species — i. e. in the first instance, all to one specimen. 

 N. archiaci was D'Orbigny's name for D'Archiac's species, whose figures and 

 description he merely copied, but the former's name canaliculata was pre-occupied 

 in Turbo. Neritopsis canaliculata is Lycett's erroneous determination of the fossil 

 here called Nat. montreuilensis, and Nerita laevigata is Wright's erroneous 

 determination for the same specimen. 



Natica punctura (Bean). Plate VIII, figs. 3, Sa; Plate IX, figs. 10, 11. 



1839. Littorina punctura, Bean, Mag. Nat. Hist., vol. iii, p. 62, fig. 23. 



1882. Hudleston, Geol. Mag. [2], vol. ix, p. 201, pi. v, fig. 11. 



Type. — " Shell turbinated, finely striated longitudinally and transversely. . . . 

 Whorls (6) rounded and well divided, the body whorl occupying one half the length 

 of the shell. Aperture elliptical, pillar lip thick and a little flattened, outer lip 

 very thin. Length nearly f inch, breadth | inch." From the Cornbrash of Scar- 

 borough. Present depository unknown. 



Description. — The proportions of the shell vary within certain limits, so thai 

 the figures above given are not universal. Thus the relative breadth in Hudleston's 

 figure is y^ = f , in the figured specimen -f^r, a third ^f . Also the relative 

 length of the body whorl to the whole (along surface axial line) can only be roughly 

 called one half; it is y§, yf, ^§, \^. The punctures are spiral lines, but correspond 

 longitudinally. The spiral angle is 50°-60°. The general surface is throughout 

 curvilinear. No angles or straight lines need be employed to represent it. 



Distribution. — This is essentially a Yorkshire fossil, twenty-four having been 

 found at Scarborough, but it has extended to Sudbrook (7), Peterborough (1), and 

 Bedford (3). Beyond this it has not been found. Naticse of any kind are scarce. 



Relations. — This is not the Natica punctura figured by Morris and Lycett from 

 the " Bath oolite" of Yorkshire, as may be seen by the figure itself (it is much too 

 broad), and it is not even mentioned in Hudleston's account of the Gasteropoda of 

 the Inferior Oolite. Nor is its relation to N. ba/jocensis any longer upheld. It is 



