576 MR R. BULLEN NEWTON ON SOME CRETACEOUS BRACHIOPODA 



Occurrence. — The specimen is associated in the same matrix (calcareous sand- 

 stone of brownish-grey colour) with a compound tubular coral of crystalline and 

 mineralised structure and therefore quite indeterminable. 



Locality. — No. 273 — Hanha Gorge. 



GASTROPODA. 



Fam. Naticid^:. 



Tylostoma globosum, D. Sharpe. (PI. I, figs. 18, 19.) 



Tylostoma globosum, Sharpe : Quart. J own. Geol. Soc, 1849, vol. v, pi. ix, fig. 5, p. 379. 

 Tylostoma aff. sequiaxis, Peron : Moll. Fosn. Cretaces Tunisie : Explor. Scient. Tunisie, 1890, pi. xix, 

 fig. 23, p. 57. 



Remarks. — This form is represented by two limestone casts of which the largest 

 is much crushed in front and so obliterates all details of the aperture. It is of 

 greater dimensions than the type, although agreeing with it in contour and structure 

 of the spiral region. The second specimen is of more normal measurements, show- 

 ing a well-inflated body whorl, and a narrow and semilunate aperture with indica- 

 tions of a marginal constriction ; the summit is much covered with matrix, although 

 the penultimate whorl is well exposed. 



Dimensions. — Larger Smaller 



Example. Example. 



Length ...... 79 67 mm. 



Width . . . . . .74 55 „ 



Distribution.— The species was originally described from the Cretaceous of 

 Portugal, and Chofpat has recognised it as ranging in that country from Cenomanian 

 to Turonian. Peron quotes it from the Senonian of Tunisia, whereas Pervinquiere 

 regards it as belonging to the Lower Turonian of that country. It should be also 

 mentioned that the present Angola examples of this species bear considerable 

 resemblance to C. A. White's * T. globosum (?) from the Cretaceous beds of Brazil 

 (Sergipe), which therefore indicates the zone of Schloenbachia injiata. The species 

 is in no way related to Choffat's Tylostoma pechueli from the Albian of Dombe 

 Grande, Angola,! nor can it be stated to be equivalent to Tylostoma sp. of the 

 same author from the Schloenbachia injiata zone of Dombe Grande and Catumbella, 

 Angola, because the characters of that form are not known, the determination being 

 without figure or description.} 



Occurrence. — In a light-coloured limestone. 



Locality. — No. 100 — Gypsum beds by Catumbella Bridge; and Lobito (collected 

 by Mr E. Robins). 



* "Contributions to the Paleontology of Brazil," Archiv Mus. Nacion. Brazil, 1888, vol, vii, pi. xvii, 

 fig. 10, p. 190. 



t Mem. Soc. Phys. Hist. Nat. Geneve, 1888, vol. xxx, No. 2, pi. iv, figs. 6, 7, p. 80. 

 J Contrib. Geol. Colonies Portwjaises Afrique, 1905, No. 2, p. 57. 



