Mr Ether idge on a Sinall Naticiform Gastewpod. 169 



position of the upper portion of the outer lip in regard to the 

 longer axis of the shell. In contrast to this, is the much 

 more prominent, outstanding, and longer inner lip, giving to 

 the aperture a somewhat more angular appearance. Lastly, 

 there is no evidence of an umbilicus in Platyostoma, which, 

 if it exists in Flatyostomella, as I suspect it does, will form a 

 further point of divergence. To express the general resem- 

 blance to Conrad's genus, and, at the same the trivial 

 differences, I have proposed the name here used. 



Zoc. and Horizon. — Eaw Camps Quarry, near Midcalder, in 

 a bed of shelly limestone, known as " Buckie-fake," at the base 

 of the Burdiehouse or Queensferry Limestone {Mr J. Bennie) ; 

 Drumsheugh, near Dean Bridge, Edinburgh, in shale (?) 

 {Mr Gall) ; Craigkelly Quarry, near Burntisland, in shale asso- 

 ciated with Spirortis pusillus (Martin) ; Entromostraca, and 

 fragmentary bivalves (Mr J. Bennie), where it occurs in 

 thousands. The little bivalve is an aviculiform shell, but 

 I have not seen sufficiently well preserved specimens to ven- 

 ture on a description. 



At a point on the Fife coast, near Fifeness, a bed of limy- 

 shale occurs in the Lower Carboniferous, or Calciferous Sand- 

 stone series, which there constitute the coast line, crammed 

 with a form of Naticopsis in almost as great a profusion as 

 the Platyostomella is to be found at Craigkelly. The follow- 

 ing is a description of this shell : 



Genus Naticopsis — MCoy, 1844. 



(Synop. Carb. Lime Foss., Ireland, p. 33; Brit, Pal. Foss., fas. 3, 

 pp. 301 and 543.) 



Naticopsis, sp. ind. (PL III., Figs. 10-12). 



Sp. Char. — Shell, in general form, more or less oval, glo- 

 bose, with little or no obliquity, of four or five convex whirls. 

 Body whirl convex, inflated, greatly exceeding the other com- 

 bined whirls in size, which form a short but well-marked 

 spire. The upper part of the body whirl, or that next the 

 suture horizontally flattened to a greater or less extent, pro- 

 ducing a shoulder-like appearance. Suture, especially that 

 between the two last whirls, well marked and channelled rather 

 VOL V. M 



