GASTEROPOD FAUNA IN THE MILLSTONE GRIT OF SCOTLAND. 355 



beautifully preserved example which shows the character of the ornament very perfectly. 

 I can find no figure of any British Carboniferous shell which in any way agrees. 



Entalis Meekianum, Geinitz, sp., 1866. (PL II. fig. 54.) 



Dentalium Meekianum, Geinitz, 1866, Garb, und Dyas in Nebraska, p. 13, Tab. i. fig. 20. 



„ ,, Meek and Hayden, 1872, Fin. Rep. U.S. Geol. Surv. Nebraska, p. 224, pi. xi. 



fig. 16, a, b. 



Specific Characters. — Shell a conical tube with a gentle curvature ; aperture circular. 

 Lines of growth fine, with irregular deeper sulci. 



Locality. — Stirlingshire, Torwood Glen, 2| miles N.W. of Larbert. Tl765 B . 



Observations. — A single specimen of this shell has occurred. The exterior is not 

 well preserved, but seems to be smooth. It may be decorticated, however. Dentalium 

 Meekianum, Geinitz, from the Coal Measures of Nebraska, is said to have fine moderately 

 distinct lines of growth passing very obliquely round the shell, with here and there a 

 deeper sulcus. Of this character I can see no trace on the Scotch specimen. 



A species of the genus is not uncommon in the marine beds of Congleton Edge, 

 300 feet below the third grit. It is much larger than the Scotch specimen, but of 

 course this is not of specific value, and it may be said that only the narrow terminal 

 portion of the latter is preserved. The Congleton Edge specimen has no longitudinal 

 striae, but has almost concentric lines of growth with irregular deeper sulci in places, 

 thus corresponding to Meek's description, to which I have alluded above. Meek draws 

 attention to the fact that Geinitz represented the lines of growth in his figures as if 

 they were spiral — a fact which he states to be incorrect. I have followed de Koninck: 

 in using the generic name of Entalis, this genus possessing a slit on the dorsal surface 

 of the posterior or narrow end which is absent in Dentalium. 



Euphemus d'Orbigniji, Port., sp. (PL II. figs. 57, 58.) 



Bellerophon d'Orbiynyi, Portlock, 1843, Rep. Geol. Londonderry, p. 401, pi. xxix. fig. 12. 

 1 Bellerophon carbonarius, Cox, 1857, Kentucky Geol. Rep., vol. iii p. 562. 



„ ,, Geinitz, 1866, Garb, und Dyas in Nebraska, p. 6, Tab. i. fig. 8. 



„ „ Meek and Hayden, 1872, Fin. Rep. U.S. Geol. Surv. Nebraska, p. 224, 



pi. iv. fig. 16 ; pi. xi. fig. 11, a, b, c. 

 Euphemus d'Orbiynyi, de Koninck, 1833, Ann. Mus. Roy. d'Hist. Nat. Belg., tome viii. p. 156, 

 pi. xlii. bis, fig. 5; pi. xliii. figs. 9-12; pi. lxii. figs. 10-12. 



Specific Characters. — Shell gibbose, umbilicus small, sides compressed. Aperture, 

 transverse subtruncate. The surface is ornamented by about twenty-four spiral ridges 

 separated by concave spiral sulci, which become obsolete over the greater portion of the 

 terminal whorl, and are closer together on the side of the umbilical slope, 



Localities. — Stirlingshire, Torwood Glen, 1\ miles N.W. of Larbert ; Linlithgow- 

 shire, river Avon ; Midlothian, Bilston Burn section. 



TRANS. BOY. SOC. EDIN., VOL. XLVI. PART II. (NO. 15). 54 



