360 F. R. Coirpcr Reed — Nac FoHnik from Havcrfordicest. 



backward more or less strongly toward the band on both the npper 

 and lower sides of the whorls. 'I'yp®' -^- n^'^lfcvis, Ulrich." 



The specimens fi'om the Redhill Beds occur only as internal casts 

 or external impressions of the shell, and are generally more or less 

 crushed and distorted. They are the commonest gasteropods on this 

 horizon, and from the examination of a large series of specimens 

 the above description has been drawn up. The characters of the 

 base, umbilicus, and inner lip are always distinct, and the position 

 and peculiarities of the band and surface-markings are clearly 

 preserved on two or three shells. 



A comparison with Ulrich's figures and descriptions of American 

 species suggests that our Redhill form is closely allied to E. cannlifera, 

 Ulrich,^ and K lahiosa, Ulrich,- from the Stones River Group of 

 Tennessee. The well-known species generally known as Trochus 

 ellipticus, Hisinger, from the Ordovician of Northern Europe is 

 a much more elevated and conical shell with a smaller apical angle. 

 The subgenus of P/e«ro<omar/rt which has been named by Miss Di)nald 

 Palaoschisma^ is said to differ from Eotomaria in having "a distinct 

 though short slit, instead of a sinus in the outer lip." In the case of 

 our Haverfordwest specimens of ^. Robertsi, the state of preservation 

 has not permitted me to determine whether a sinus or slit is present, 

 but they diiier much more from the type and only species of 

 Palaoschisma (P. girvane^tse) in all other observable characters than 

 they do from the above-mentioned species of Eotomaria, so that 

 their reference to the latter genus appears fairly certain. 



Eotomaria cf. elliptica (Hisinger). 



In addition to E. Robertsi, a taller, more conical species of 

 Eotomaria occurs which, so far as it is preserved, appears to be 

 comparable to the Ordovician form described by Hisinger as Trochus 

 ellipticus.* One specimen from the Redhill Beds of Preudergast 

 Place has an apical angle of G0°, a height of 18 mm., and a basal 

 width of about 15 mm. The species was believed by Portlock* to 

 occur in the Ordovician of Tyrone, but Miss Donald (op. cit., p. 337) 

 declares that it is a distinct species, and she would apparently place 

 Hisinger's shell in her subgenus Palaoschisma. 



Horizon. — Redhill Beds. 



Localities. — Prendergast Place and Lane, Haverfordwest. 



LoPHOSPiRA cf. turrita, Portlock. (PL XX, Figs. 6, &a.) 



Shell elevated, turreted, composed of about 5 (?) whorls with 

 subangular periphery above middle and rather rapidl}' increasing in 

 size to base ; basal whorl ventricose, high. Apical angle 50°. Upper 

 surface of whorls with one prominent carina about two-thirds the 



1 Ulrich : op. cit., p. 1002, pi. Ixix, figs. 9-14. 



* Ulrich: op. cit., p. 1003, pi. Ixix, figs. 15-17. 



s Donald: Quart. Journ. Geol. Soc, vol. Iviii (1902), p. 335, pi. ix, figs. 11, lla. 



* Hisinger: Leth. Suec, 1837, p. 35, pi. xi, fig. 1. Lindstroni : Silur. Gastrop. 

 Pterop. Gotland, p. 104, pi. viii, figs. 10-14. Koken: Bull. Acad. Imper. Sci. 

 St. Petersb., ser. v, vol. vii (1897), No. 2, p. 152. 



' Portlock : Geol. Eep. Londond., p. 414, pi. xxxi, fig. 1. 



