70 ORDOVICIAN AND SILURIAN BELLEROPHONTACEA. 



not simply on the ridge of the dorsum ; the ornamentation is finer and the transverse 

 lines meet the slit- band at a larger angle. C. alata (Portl.) and B.fasciatus, Lindstr., 1 

 are related more or less closely to it. Similar laterally projecting umbilical 

 callosities which support the basal angles of the mouth are found in II. i I'roso- 

 ptychus) plateius, Barr., which Perner 2 considers allied to B. globulus, Lindstr., a 

 species referred by Koken to his genus Cymbularia. The types are in Mrs. 

 Gray's Collection. 



8. Cymbularia ? woodlandensis, sp. now Plate XI, figs. 9, 10. 



Specific Characters. — Shell lenticular, compressed, acutely carinate, with outer 

 whorl almost completely enveloping inner whorls. Umbilicus very small, open, 

 about one-sixth the diameter of the shell, and with centre situated at about two- 

 fifths its height. Outer whorl (large, rapidly increasing in height, but slowly in 

 width, with gently convex sides and sharp acute dorsum without distinct carina, 

 but bearing very narrow slit-band; umbilical edge abruptly rounded; umbilical 

 slope short, steep. Mouth not expanded, nearly three times as high as wide with 

 deep acute narrow V-shaped sinus in outer lip and large rounded apertural lobes. 

 Surface of shell covered with rather coarse sublamellose transverse lines crossing 

 umbilical ei\ge obliquely and arching very strongly back on sides to meet dorsal 

 edge at 30°. 



Dimensions. — Height of shell, 30 — 34 mm. ; thickness above umbilicus, 

 7 — 10 mm. 



Horizon,. — Saugh Hill Group, Llandovery Series. 



Locality. — Woodland Point, Girvan. 



Remarks. — The specimens of this shell are not usually in a good state of pre- 

 servation, and the slit-band is only represented by occasional traces. The shell 

 has the appearance of Oxydiscus, but has a slit-band. It is doubtful if it should 

 be referred to Zonidiscus or Cymbularia, but its resemblance in general characters 

 to 0. tarda (Barr.), 3 inclines me to refer it to the latter genus. The type-specimens 

 are in Mrs. Gray's Collection. 



9. Cymbularia cf. fastigiata (Lindstrom). Plate XI, figs. 11, 12. 



1884. Bellerophoti fastigiatus, Lindstrom, Silur. Gastrop. Pterop. Gotland, p. 76, pi. vi, figs. 1 — 10. 



Specific Characters. — "Shell rather more discoid than globular, aperture 

 transverse and triangular in outline, the base being only slightly arched. 



1 Lindstrom, op. cit., p. 75, pi. vi, figs. 13, 14. 



2 Perner, op. cit., p. 141, text-fig. 101. 



3 Perner, op. cit., p. 77, pi. lxxxvii, figs. 32 — 34, 36, text-fig. 105 a — c. 



