Professor J. W. Gregory — New Cretaceous Bryozoa. 65 



and crowded, separated by only very narrow inter-radial furrows. About seven 

 apertures in each ray. Apertures large. 



. Distribution. — Cenomanian — Lower Quader : Gamighiigel, near 

 Dresden ; Kahlebusch, near Dolina, Saxony. 



Discocavea longiradiata, n.sp. 



Diagnosis. — Zoarium large, thin, circular. Zooecia very numerous and apertures 

 occurring in many (about forty) long rays, which each contain from about ten to 

 sixteen apertures. IS'o selvage. Inter-radii very narrow. 



Distribution. — Lower Chalk : Southeram Pit, near Lewes. 



BiMULTiCAVEA, d'Orbiguy, 1853. 

 (Bry. Cret., p. 982.) 



Bimulticavea simonoivitscM, nov. nom. 

 Synonymy. 



Ceriopora stellata, pars, Goldfuss, 1829. Petref. Germ., p. 85, pi. xxxi, fig. le 



{non figs. Iff, b). 

 Semimtdticava guldfussi {non von Reuss, 1866), Simonowitseh, 1871. Bry. 

 Essen Griins. : Verb. nat. Ver. preuss. Eheinl., vol. xxviii, pp. 34-6, pi. i, 

 figs. ^a-d. 

 Diagnosis. — Zoarium large, massive; Goldfuss' type is 45 ram. long by 18mm. 

 wide, with radial groups up to 6 mm. across. Each group has about eight spindle- 

 shaped raised radial groUps with biserial apertures. 



Distribution. — Cenomanian — Griinsand : Essen. 



Tkochiliopora, nov. gen. i , 



Diagnosis. — Radioporidfc with a simple top-shaped or capitate zoarium, composed 

 of a constricted stem and expanded head. Apertures in vertical series on the margin 

 of the head. 



Type Species. — Trochiliopora huniei, n.sp. Upper Chalk : Gravesend. 



Trochiliopora humei, n.sp. 



Diagnosis. — Zoarium fungiform, composed of a thick disc and stout, blunt stem. 

 The diameter of the stem is nearly half that of the head. The lower end of the 

 stem is longitudinally grooved, with linear pores. In the upper part of the stem 

 the pores are irregularly arranged, and the intervening walls are reticular. Base of 

 stem discoid. The upper surface of the disc is flat ; its central portion is large, with 

 numerous irregularly arranged apertures of young zooecia. Margins vertical or well 

 rounded, and marked by radial series of large apertures ; there are three to four 

 apertures in each series, and the series are separated by lines of cancelli. 



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

 Gravesend. 



DoMOPOKA, d'Orbigny, 1849. 



Domopora colligata, n.sp. 



Diagnosis. — Zoarium large and irregular ; from the upper side it appears tubercular 

 and massive. On a side view it is seen to be composed of numerous columns which 

 are often attached, giving the zoarium a massive aspect like a Madiopora. The 

 sub-colonies are distinct and thick. Apertures irregular in the centres of the sub- 

 colonies, but become radial and vertical on the sides. In the lower sub-colonies the 

 regular arrangement of the apertures is obscure, as most of the apertures in the 

 vertical series are covered by the overgrowth of the upper sub-colony. 

 Distribution. — Lower Greensand : Earringdon, Berkshire. 



DECADE V. VOL. VI. NO. II. 5 



