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SUPPLEMENT TO THE BRITISH 



17. Terebratella oblonga, Sow. Dav., Cret. Mon., PI. II, figs. 29 — 31. 



The loop is the same as in Terebratella Fittoni. This remarkable and widely spread 

 species varies very much in shape and character, some examples having their valves 

 almost uniformly convex, with ribs gradually decreasing in width from the centre to the 

 lateral margin, while others present an almost defined mesial fold with some of its 

 ribs narrower than those that cover the lateral portions of the shell. It seems to 

 characterise the Aptian or Lower Greensand of several British as well as foreign localities. 

 In addition to Hythe, it has been found by Mr. Meyer at Godalming and Sevenoaks, and in 

 the Sponge-gravel of Windmill Pit, Earingdon ; also in the Red Gravel of Badbury Hill. 

 I picked it up in rocks of a similar age at Drap, near Nice. T. oblonga and its var. 

 pectiniformis, Roemer, abound in the " Hils " (Lower Greensand) of Schoppendedt and of 

 Essen, and is very common in the Neocomian or Calcaire a Spatangues of Morencourt, in 

 France, and in many other places. 



18. Terebratella Fittoni, Meyer. Sup., PI. VIII, figs. 8 to 13. 



Terebratella Fittoni, Meijer. Q-eoT. Mag., vol. i, pi. xii, figs. 1 — 10, 1864. 

 ? Terebratula quadrata, Sow. Fitton, Geol. Trans., 2nd ser., vol. iv, p. 338, pi. xiv 



Nig. 9, 1836. 



Spec. Char. Shell ovate, or somewhat irregularly pentagonal, a little longer than 

 wide, greatest breadth about the middle ; dorsal valve convex, nearly as wide as long. 

 Ventral valve deeper and more convex than the opposite one, sometimes flattened along 

 the middle ; beak short, incurved ; foramen small, slightly separated from the hinge-line by 

 a deltidium in two pieces ; beak-ridges sharply defined, with a flattened space between 

 them and the hinge-line. Surface of both valves ornamented by a variable number of 

 small, rounded, dichotomous ribs, with interspaces of about equal breadth between them. 

 In some aged examples three or four central ribs are slightly more elevated than those on 

 the lateral portions of the valves, producing an undefined mesial fold. Surface of valves 

 crossed at intervals by concentric lines of growth. Loop long, doubly attached. 

 Length 9, width 8, depth 6 lines. 



Obs. This species has been minutely described and illustrated by Mr. Meyer, and 

 since there prevails some uncertainty as to whether it and T. quadrata, Sow., may not be 

 the same species, it will, I think, be preferable to retain for the shell under description 

 the name given to it by Mr. Meyer. It varies a good deal in shape and in the number 

 of its ribs ; from twenty-four to forty may be counted round the margin in different 

 examples. It is a much smaller shell than T. oblonc/a ; but some elongated specimens, 



