Vol. 55.] ECTOMAHTl ANJ) KOEMOTOMA. 267 



lata (His.), from which it is distinguished by its more convex whorls, 

 greater spiral angle, and also the position ot the band, which is 

 apparently rather higher. Better preserved specimens may perhaps 

 prove it to be a variety of that species, for it is difficult to make a 

 satisfactory comparison from casts. All the internal moulds of 

 H. cingulata (His.), however, that I have seen have the whorls still 

 flatter than in the shell itself. 



Locality and Horizon. — The specimens are all from the 

 Aymestry Limestone of Knapp Lane, Ledbury. The largest example 

 (PL XXII, fig. 2) is slightly compressed ; it measures 61 mm. in 

 length, and 30 mm. in ^idth. 



HoRMOTOMA Griffithi, sp. nov. (PI. XXII, figs. 3-5.) 



Murchisonia cingulata, ? var., F. M'Coy, 1846, ' Syn. Silur. Foss. Irel.' p. 16 & 

 pi. i, fig. 18. 



Non Turritella cingulata, W. Hisinger, 1837, 'Leth. Suec' p. 39 & pi. xii, fig. 6. 



Non Murchisonia cingulata, F. M'Coy, 185-5, ' Bvit, Pal. Foss.' p. 293 ; {pars) 

 J. J._ Bigsby, 1868, 'Thes. Sil.' p. 158 ; {pars) R. Etheridge, 1888, ' Foss. Brit. Is.' 

 vol. i (Palaeozoic) p. 113. 



Description. — Shell elongated, conical, composed of more than 

 four whorls. Whorls increasing gradually, high, smooth, slightly 

 convex. Sutures of moderate depth, rather oblique. Sinual band 

 situated slightly above the middle of the body-whorl, and near the 

 middle of the higher whorls, fiat, very little depressed, bounded by 

 a groove on each side. Lines of growth strong, sharp, retreating 

 very obliquely backward to the band and forward again below, 

 invisible on the band itself. Aperture subovoid. Columella slightly 

 thickened and arched forward. Base produced. 



Remarks and Resemblances. — This species was described 

 by M'Coy as a variety of M. cingulata (His.), from which it is dis- 

 tinguished by its narrower whorls, the higher position of the band, 

 and more produced base. In M'Coy's figure a keel is represented 

 below the suture, but I cannot discern any distinct traces of it, there 

 being merely part of the matrix left in some of the sutures. What 

 appear to be grooves limiting the baud may be the result of wea- 

 thering, and originally there may have been a raised thread on each 

 side, as is usually the case in Bormotoma^ but these threads are 

 generally so slight as to be easily obliterated. The specimens are 

 greatly compressed, so much so that it is impossible to make a just 

 comparison with other species. H. Griffithi bears some likeness to 

 H. articulata^ but is of much greater size ; there are no signs of 

 lines of growth on the band, and the whorls are apparently not so 

 convex. H. similis resembles it more in size, but the position of 

 the band is much lower. 



Dimensions and Locality. — There are only two specimens 

 in the Museum of Science and Art, Dublin, both fragmentary, greatly 

 compressed, and partially embedded in the matrix. That figured 

 in PL XXII, fig. 3, consists of four whorls which measure 41 mm. in 

 length. It is from Cappacorcogue, Cong (Co. Galway). The other 

 (PI. XXII, figs. 4 & 5) alone shows the lines of growth, but has only 

 two and a half whorls preserved, which measure 44 mm. in length, 



