NEWTON : ON COLORATION IN FOSSIL SHELLS. 287 



GASTROPODA. 

 Capclus MARGARITA, G. S. Boulger. PI. XXIV, Fig. 5. 



Capulus margarita, Boulger; Proc. Geol. Assoc, vol. xi (1890), p. 445, 

 pi. iv, figs, 1-3. 



Formation. — Bernician. 



Locality. — Ayrshire. 



This interesting fossil was originally described as " showing dark 

 olive green colour-bands radiating from the apex of the spire." 

 Mr. Boulger's figure 1, representing a natural sized drawing of the 

 original specimen, is reproduced on the present plate. 

 Platyostomella ScoTOBtJRDiGALENsis, R. Etheridgo, jun. PI. XXIV, 



Figs. 6, 7. 

 Platyostomella Scotohurdigalensis, Ethcridge : Proc. Rov. Phys. Soc. 

 Edinburgh, vol. v (1880), p. 161, pi. iii, figs. 1-6.' 



Formation. — Bernician. 



Locality. — Fifeshire. 



Mr. Etheridge, jun., described this species more than a quarter of 

 a century since, as " a small Naticiform Gastropod showing colour- 

 bands." These colour-remains were found to be very variable, the 

 bands occurring in pairs and also singly, being arranged both spirally 

 and longitudinally, whilst one of the examples showed no bands at all. 

 Figs. 6 and 7 of this paper, copied from Etheridge's original plate, 

 illustrate the single-banded character and also the twinned condition 

 observed in some examples of the species. The specimens are 

 extremely small from the fact that the figures are said to be ten times 

 enlarged. 



MouELONiA CARiNATA (J. Sowcrby). PI. XXIV, Fig. 4. 



LLeli.v carinatns, J. Sowerby : Min. Conch., vol. i (1812), p. 34, pi. x, 



upper and lower figures. 

 Fleurotomaria flammigera, Phillips : lUust. Geol. Yorkshire, pt. ii, 



The Mountain Limestone District, 1836, p. 226, pi. xv, fig. 2. 

 Fleurotomaria carinata, J. de C. Sowerby : Min. Conch., vol. vii (18^14), 



p. 70, pi. 640, fig. 3. 

 Mourlonia caritiata, Koninck : Ann. Mus. Roy. Hist. Nat. Belgique, 

 vol. vii (1883), pt. 4, p. 77, pi. xxxiii bis, figs. 4, 5. 



Formation. — Bernician. 



Locality. — Yorkshire. 



Phillips originally referred to this Pleurotomaroid shell by stating 

 " colour varied with zigzag flashes." The markings mostly occur on 

 the surface of the body-whorl and above the so-called band which 

 characterizes this group of shells ; only rarely are they seen below that 

 structure. They consist of thick zigzag stripes, more or less equally 

 spaced, regular, and arranged transversely, and between them can be 

 seen the fine striations which form the sculpture of the shell. 



The zigzag markings were not present on the specimen selected for 

 illustration when James Sowerby published his account of this species. 

 In the meantime Phillips issued a remarkablj^ good figure, showing 

 these remains of ancient coloration, and referred his specimen to the 



