NEWTON : ON COLOEATION IN FOSSIL SHELLS. 285 



Locality. — Stratton, Gloucestershire. 



This specimen represents the hody-whorl of Natica cincta, on which 

 is clearly depicted a series of nearly equidistant, black, divergent 

 markings, extending from the suture to the basal margin, the apices 

 of the angles pointing inwards or away from the margin of the mouth. 

 The test of this specimen is ornamented with a series of closely 

 arranged longitudinal striations. A recent form of this genus, Natica 

 fulminea of Gmelin, shows zigzag colour-iiaarkings, but they are less 

 regular, smaller, and more complicated than in the fossil example now 

 figured. 



The specimen is in the British Museum [G. 1604]. 



PsEUDOMELANiA Heddingtonensis (J. Sowcrby). PI. XXIV, Fig. 13. 

 Mela?iia Heddingtonensis, J. Sowerby : Miu. Conch., vol. i (1813), 



p. 86, pi. xxxix, right- and left-hand figures. 

 Chemnitzia Reddingtoncnsis, D'Orbigny : Paleontologie Frangaise, 



Terrains Jurassiques, Gasteropodes, 1850, p. 56, pi. ccxliv, 



figs. 4, 5. 

 Pseiidomelania neddingtone7isis.,. Hudleston : "A Catalogue of British 



Jurassic Gasteropoda," 1892, p. 111. 

 Formation. — Oxfordian. 

 Locality. — France. 



A number of regularly spaced, well-indented, zigzag markings 

 occur in longitudinal rows on the later whorls of this species, when 

 favourably preserved ; liritish examples, however, seldom show these 

 indications of colour-remains. A reproduction of D'Orbigny's figure 4 

 is given on the present plate. The original remarks in connection 

 with the curious zigzag patterns are as follows : — " Ses couleurs dont 

 on juge par les lignes d' alteration de sa surface ferment des lineoles 

 ondulees, ou des zigzags en long." 



PsEUDOMELANIA cf. LINEATA (J. Sowerby). 



Melania lineata, J. Sowerby: Min. Conch., vol. iii (1818), p. 33, 



pi. ccxviii, fig. 1. 

 Melania Heddingtonensis, Deslongchamps : Mem. Soc. Linn. Xormandie, 

 vol. vii (1842), p. 225, pi. xii, figs. 9, 10 ; non Sowerby. 



Formation. — Bajocian. 



Locality. — Normandy, France. 



An elaborate figure of a so-called Melania Heddingtonensis was 

 published by Deslongchamps in 1842 (fig. 10 of his plate), drawn from 

 an example found in the Bajocian rocks of Les Moutiers, Normandy, 

 in which* is depicted, on a kind of cream - coloured groundwork, 

 numerous reddish- brown streaks of various forms arranged both 

 transversely and longitudinally, some bifurcating into fine lines, 

 whilst many take a zigzag course. According to these figures, this 

 complicated coloration exists from the apex of the spire to the 

 margin of the mouth. This specimen has a length of 85 mm. 



It was subsequently pointed out by D'Orbigny that Deslongchamps 

 was in error as to the specific determination of this shell (Paleontologie 

 Frangaise, Terrains Jurassiques, Gasteropodes, 1850, p. 57), and he 



