BEYRICHIA. 21 



In B. oculina, Hall,' the central lobe seems separated below, and the lateral 

 lobes coalesce beneath it. 



Professor Rupert Jones has suggested a comparison of it with the specimen 

 of B. Kloedeni, M'Coy, figured by him in 1881.^ It does not seem to me that the 

 rather numerous though always distorted specimens I have seen show signs of 

 conformability to that species. Their lobes are always long, straight, and evenly 

 joined below. 



B. Steusloffii, Krause,^ seems to differ in the same manner. 



B. Wilchensiaua, Jones, as given by Krause,* seems to have thicker lobes, and 

 a more elaborated anterior end. 



2. Beyrichia Damesii, Kraiise ? Plate III, fig. 16. 



189L. Beyrichia Damesii, Krause. Zeitsch. Deutscb. Geo). G-eselL, vol. xliii, 



p. 502, pi. xxxii, figs. 1 — 3. 



Description. — Valve small, elongate, suboval. Ventral margin nearly straight. 

 Ends obliquely convex. Valve having three subequal tubercles between two broad 

 shallow furrows ; the central tubercle being the most nodular, and the lateral 

 tubercles indistinctly united below. 



Size. — Length "G mm. 



Locality. — One specimen from Pilton is in the Porter Collection. 



Bemarl's. — This specimen is indistinct, but as far as can be seen it presents 

 almost exactly the appearance of B. Damesii, and therefore I venture to refer it 

 provisionally to this species. 



Affinities. — To B. concinna, Jones and Holl,^ it is very similar, but the lobes 

 appear to be thicker in that species. Several of the varieties ^ of B. Kloedeni, 

 M'Coy,''' are sufficiently like it to suggest that it possibly may prove nothing beyond 

 a variety of that highly unstable species. 



^ 1890, Jones, ' Quart. Journ. Geol. Soc.,' vol. xlvi, p. 16, pi. i, fig. 4. 

 2 1881, Jones, ' Geol. Mag.,' dec. 2, vol. viii, p. 337, pi. x, fig. 2. 



^ 1891, Krause, ' Zeitsch. Deutsch. Geol. Gesell.,' vol. xliii, p. 505, pi. xxxii, figs. 7 — 9. 

 * 1877, ibid., vol. xxix, p. 35, pi. i, figs. 18 a, b. 



^ 1886, Jones and Holl, ' Ann. Mag. N. H.,' ser. 5, vol. xvii, p. 356, pi. xii, figs. 22 a, b. 

 6 1886, ibid., p. 349, pi. xii, figs. 3, 4 ; and 1893, Jones, ' Quart. Journ. Geol. Soc.,' p. 301, pi. xiv, 

 fig. 3. 



T 1846, M'Coy, ' Syn. Sil. Foss. Ireland,' p. 58, woodcut. 



