THE RED CHALK OF HUNSTANTOIf. 485 



species the area-opening appears to me to be perfectly normal. The 

 folding-in of the wall below the area also precludes the placing of 

 the form here described even as a variety of Memhranipora catenu- 

 laria, Jameson (Hincks, Brit. Mar. Polyz. pi. xvii.). 



I have figured the Red-Chalk form of M. gaultina, but I have 

 had the better-preserved Gault examples before me when drawing 

 up the characters. It is in the Gault form that the puckering of 

 the wall below the area is found. 



40. Membranipoea eragilis (d'Orb.). 



1852. FlustreUanafragills'?, d'Orb. Terr. Cret. v. p. 545, pi. 723. 

 figs. 5-9. 



I have met with two or three examples of a form closely resem- 

 bling the F. frafjilts of d'Orbigny. Very rarely more than from 

 3 to 6 cells are preserved ; and the fossil cited below contains the 

 best-preserved colony that I have found. As the Red Chalk, so far 

 as my experience goes, is very poor in Cheilostomatous forms, I have 

 done my best to preserve every record of their existence, hoping 

 that other workers will be able to add to the meagre list. 



Hahitai. On Terehratida biplicata. Fossil No. 41. 



Horizon. Red Chalk, Hunstanton. 



41. Membranipora elliptica (?) (Hagenow). 



1839. Cellepora elliptica., Hag. J^Teues Jahrbuch &c., p. 268 ; 

 Marginaria elliptica, Roemer ; Memhranipora elliptica, d'Orb. 



1877. Memhranipora elliptica. Hag ; Novak, Bryoz. bohm. Kreid. 

 p. 89, pi. 2. fig. 16. 



Hesitating to identify this species with von Hagenow's C. ellip- 

 tica, I refer the student to the long list of synonyms given by 

 Novak, and to his reasons for adopting that course. I have only 

 one example ; and as Novak's fig. 16, pi.' ii., closely resembles its 

 general features, his identification is adopted. I should have been 

 more inclined to place this unique example under M. tuherosa, 

 Novak, but the cells of that species are not elliptical, like the British 

 Red-Chalk form. The avicularian cells in the intermediary space 

 between the ordinary zooecia are very conspicuous and abundant on 

 the Fossil No. 42. 



Hahitat. On Pentaorinas Fittoni. Fossil No. 42. 



Horizon. Red Chalk, Hunstanton. 



42. MEiMBRA:NiPORA OBLIQUA (?) (d'Orb.). 



1852. Filiflustrellaria ohliqua, d'Orb. Terr. Cret. v. p. 513, 

 pi. 723. figs. 1-4. 



If we are to regard d'Orbigny's species mentioned above as a 

 Memhranipora, then the present form is allied to, if not identical 

 with, it. The British example, the only one that I have met with, 

 is adherent to a fragment of a Belemnite, and is apparently much 

 larger than the fragment figured by d'Orbigny. The zoarium 



Q. J. G. S. No. 183. 2 m 



