66 C. P. Chatwin ^ T. H, Withers— Fauna of the Chalk Rock. 



Bomoi^ra vinei, n.sp. 



Synonymy. 

 Domopora poli/iaxis?, non (Hag.), Vine, 1885. Cambr. Grnsd. : Proc. Yorks Geol. 



Soc, vol. ix, p. 21. 

 ,, ,, ? ,, Vine, 1889. Further on Canibr. Grnsd., pt. ii : 



ibid., vol. xi, pt. ii, pp. 2-58, 270. 

 ., ,, ? ., Vine. 1891. Rep. Cret. Polyz. : Eep. Brit. 



Assoc, 1890, p. 389. 

 Diagnosis. — Zoarium small, of two or more stems arising from a circular base. 

 The stems are sharply divided by transverse annular constrictions into several 

 segments, which decrease in diameter towards the blunt apex. Apertures in vertical 

 series, containing from two to five in each series. The apertures in the series are 

 in places well raised above the general sm-face of the stem. Mesopores scarce. 



Distribution. — Cambridge Greensand : Cambridge. 



Bomopora virgulosa, nov. nom. 



Synonymy. — Ceriopora stellata, pars, Goldfuss, 1829. Petref. Germ., p. 85, 

 pi. XXX, fig. 12, non pp. 39 and 85, pi. xi, fig. 11 ; pi. xxxi, figs. la-c. 



Diagnosis. — Zoarium sub-dendroid or tufted ; it grows either in numerous short 

 branches from a broad base, with the branches bifurcating occasionally, or as 

 cylindrical branches, which may either give off above many sub-branches or expand 

 distally into irregular lobes, or the main stem may expand into a thickened body 

 giving off above small cylindrical stems. Sides marked by annular constrictions. 

 The end consists of a group of crowded, irregularly arranged zooecia, surrounded by 

 the radial series, which pass into the vertical marginal series. 



Distribution. — England — Upper Greensand : "Warminster, and Chute 

 Farm, near Warminster, Wilts. Zone of SchloenbacJda rostrata ; the 

 Cutting, Black Yen, Charmouth. Foreign — Cenomanian : Essen. 

 Lower Quader : Plauen, Saxony. 



Domopora novalci, n.sp. 

 Diagnosis. — Zoarium usually clavate, with a large lobed head and annular 

 peduncle, tapering towards the base ; but also found massive, with numerous stems 

 rising from a broad encrusting base. Zoarium of many layers, up to about ten in 

 number. Mesopores scarce, about as many or slightly more numerous than the 

 zocecia. Apertures, about six in each vertical series. 



Distribution. — Cenomanian — Korycaner Schichten : Kamajk, Zbislav, 

 Kolin, Kank, and Jine, Bohemia. 



Domopora cantiana, n.sp. 

 Diagnosis. — Zoarium small, of stems which are circular in section and marked by 

 numerous horizontal annular constrictions. The upper segments gradually decrease 

 in diameter, and the zoarium ends in a blunt point. Apertures in short vertical 

 series, including from two to six apertures in a series. Mesopores scanty, 

 . Distribution. — Upper Chalk (zone of Micraster coranguinum) : 

 Bromley, Kent. Middle Chalk (zone of Micraster cortestuditiarium) : 

 Chatham. 



IV. CONTUIBUTIOK TO THE EAtTNA OF THE ChALK KoCK. 



By Chakles P. Chatwin & Thomas H. "Withers. 

 (PLATE II.) 



ALTHOUGH small examples of Ammonites are fairly common in 

 the Chalk Rock (Turonian) of this country, large examples are 

 decidedly rare. The only species of Ammonites as yet recorded 

 from this bed are Prionocycliis neptuni^ Geinitz, sp., and Pachjdisms 

 . peramplus, Mantell, sp. The former species is always of a small size 

 and is not at all common, but small examples of the latter species, 



