NEWTON : ON COLORATION IN FOSSIL SHELLS. 291 



Formation. — Eifelian. 



Locality. — Paffrath, Germany. 



The figure given of this form is copied from Archiac & Verneuil's 

 work, pi. xxxiv, fig. 5, which represents a specimen from the 

 Devonian rocks of Paffrath, llhenish Germany. It shows three 

 distinct transverse rows of what are stated to be "brown spots" 

 forming " the remains of the colouring matter of the shell." A much 

 larger example from the same locality is in the British Museum with 

 the markings equally well preserved as are exhibited in the figure. 

 This species also occurs in the Devonian rocks of England, but no 

 specimens that have been examined have any relics of the colour-spots 

 remaining. 



The determination and synonymy of this shell are taken from 

 Mr. Whidborne's "Monograph of the Devonian Fauna of the South of 

 England." 



PAL.a:OZOIC -Silurian. 

 CEPHALOPODA. 



Okthoceeas annplatum, J. Sowerby. 



Orthoceras anmdatum, J. Sowerby: Min. Conch., vol. ii (1818), p. 73, 

 pi. cxxxiii. 



Formation. — Wenlockian. 



Locality. — Wenlock. 



The late Professor J. F. Blake called attention some years since to 

 a specimen of this species in the Museum of Practical Geology showing 

 straight longitudinal colour-bands, which were stated by Mr. A. H. 

 Foord ("Catalogue of the Fossil Cephalopoda in the British Museum 

 (Natural History)," part i, Nautiloidea, 1888, p. 54) to be very 

 distinct. Blake's published figure, however, of this specimen is not 

 particularly convincing as an example of colour-banding ("British 

 Fossil Cephalopoda," 1882, p. 91, pi. iv, fig. 4), although of interest 

 to refer to on the present occasion. 



GASTROPODA. 

 PoLYTROPiNA HELiciNA (Lindstrcim). PL XXIV, Fig. 1. 



Oriostoma helicinum, Lindstrom : Kongl. Svenska Vet.-Akad. Hand- 

 : lingar, Stockholm, vol. xix (1884), No. 6, pi. xx, figs. 30, 31. 



i, Formation. — Ludlovian. 

 ; Locality. — Gothland, Sweden. 



\. A small form of Gastropod exhibiting transverse bands of colour at 

 [ regular distances, parallel with the sculpture lines. Fig. 30 of the 

 ' original plate has been copied for this paper ; it represents a specimen 

 , having a height of 10 mm., the illustration being made twice natural 

 : size. According to Lindstrom the Gothland Silurian deposits contain 

 I a littoral fauna. 

 L The species is here referred to Polytropina of Miss Jane Donald 



(now Mrs. Longstaff), who founded this generic name to replace 



