W. D. Lang — Cretaceous Cheilostome Polyzoa. 499 



Diagnosis. Rhammatopora in which the angle of branching is wide 

 — more than 45° ; the zocecia are blunt distally ; the capitulum. is 

 bounded proximally by nearly straight lines ; and the apertures are 

 elliptical. 



Type-specimen. British Museum specimen D2051; Vine's figured 

 specimen of Membramipora gaultina, 1890, op. cit., PI. xix, figs. 

 \Za-b; T. Jesson Coll. 



Distribution. Albian, Red Chalk; Hunstanton, Norfolk. 



Remarks. Although in his first description oi Membranipora gaultina 

 Yine figured this species, it is clear from this description that he 

 intended the Cambridge Gault specimen for the type and included in 

 the species the Red Chalk and Chalk Marl forms. 



Rhammatopora gaultina (Vine). PI. XVII, fig. 2. 

 Synonymy \ 

 Membranipora gaultina, sp. nov. ; Vine*, 1890, Quart. Journ. Geol. Soc, 



vol. xlvi, pp. 484, 461 ; Gault ; Cambridge. 

 non Membranipora gaultina, sp. nov. ; Vine, 1890, loc. cit., and pi. xix, 

 figs. 13a-d ; Eed Chalk ; Hunstanton. [= Rhammatopora vinei, q.v.]. 

 non Membranipora gaultina, sp. nov. ; Vine, 1890, op. cit., p. 461 ; Chalk 



Marl. [Probably = Rhammatopora pembrokiae, q.v.]. 

 Membranipora gaultina, Vine; Vine, 1891, Proc. Yorks. Geol. Poly. Soc, 



new series, vol. xi, part iii, pp. 385, 396 ; Gault ; Cambridge. 

 non Membranipora gaultina, Vine ; Vine, 1891, loc. cit. ; Eed Chalk ; 



Hunstanton. [= Rhammatopora vinei, q.v.]. 

 non Membranipora gaultina, var., Vine; Vine, 1891, Rep. Brit. Assoc, 

 Leeds, 1890, p. 395 ; Eed Chalk ; Hunstanton. [Rhammatopora 

 vinei, q.v.]. 

 Membranipora gaultina, Vine; Vine, 1892, Proc. Yorks. Geol. Poly. Soc, 

 new series, vol. xii, part ii, pp. 154-5, pi. vi, fig. 15 ; Gault ; Barnwell, 

 Cambridge. 

 non Membranipora gaultina, Vine ; Vine, 1892, op. cit., p. 155 ; Eed Chalk ; 



Hunstanton. [= Rhammatopora vinei, q.v.]. 



non Membranipora gaultina, Vine; Vine, 1893, Eep. Brit. Assoc, Edinburgh, 



1892, p. 335 ; Eed Chalk ; Hunstanton. [ = Rhammatopora vinei, q.v.]. 



Revised diagnosis. Rhammatopora in which the angle of branching 



is wide, more than 45° ; the zooecia are blunt distally ; the capitulum 



is bounded proximally by well-curved lines ; the extra-terminal front 



wall is small laterally ; and the aperture is oval to ovate. 



Type-specimeji. Vine's type cannot be found ; but in his description 

 Vine mentions having by him specimens of this species from the Gault 

 of Cambridge and belonging to Mr. Jesson. British Museum specimen 

 D. 2062 of the Jesson collection and labelled " Membranipora gaultina, 

 Cambridge, Gault, in situ " is therefore in all probability a paratype, 

 and in the absence of Vine's examples may be taken as the type 

 specimen. 



Distribution. Albian, Gault ; Cambridge. 



Rhammatopora pembrokiae, 1 n.sp. PI. XVII, figs. 3 & 4. 

 Synonymy. 

 Probably Membranipora gaultina, sp. nov. ; Vine, 1890, Quart. Journ. 



Geol. Soc, vol. xlvi, p. 461 ; Chalk Marl. 

 non Membranipora gaultina, sp. nov. ; Vine, 1890, op. cit., pp. 484, 461, 

 pi. xix, figs. 13a-d ; Gault, Cambridge ; Eed Chalk, Hunstanton. 



1 In memory of Mary de Valence, Countess of Pembroke, foundress of 

 Pembroke College, Cambridge. 



