422 CRETACEOUS LAMELLIBRANCHIA. 



Marl (zone of Schlaenhachiti variaufi) of Ventnor and Folkestone. Zone of Holaster 

 suhijlohosns of Burliam and Lewes. Zone of Bht/nchonella Guvieri of Dover. 

 Zone of TcrehnitHlina /n^i of "Wouldham. Zone of Holaster 2)hinns of Morgan's 

 Hill, Wiltshire. 



Di;i;.vxi.v sp. cf. austixknsi.s {liiimcr), 1852. 



1855. Radiolites Mortoni. S. P. Woodward. Quart. Jouru. Geol. Soc, vol. .\i, 



p. 5i), pi. V, fif^s. 1, 2. 

 1904. Biit.\uioLtTES A0STINENSIS, H. DiiiivUlr. Mission Scieut. Perse. Ill, 



fitudes geol. iv, Paleont., 

 p. 257. 

 1909. S.\uvAGEsiA AUSTiNENSis, A Tdiicmi. Classitic. ct fivolut. des Radiolitidi's 



(Mem. Soc. f,'eol. do Fraiu-e , I'al- 

 eout., vol. xvii), p. 96, fig. 6-1. 

 rjl2. DuRANiA AusTiNENSi.s, C. F. Parana. Mem. R. Accad. Scienze di Torino, 



ser. 2, vol. Ixii, p. 287, pi. ii, fig. 4. 



Remarhs. — In the specimen from the Upper Chalk figured by Woodward the 

 siphonal bands are much broader than in Durania Mortoni, and the ribs on the 

 convex interband are finer and more widely separated. The parts recognised by 

 Toucas as siphonal bauds were regarded by Woodward as the surfaces to which 

 other individuals had been attached. 



This species has been identified with Romer's Hi pjni rites aiistinensis from Texas' 

 by the authors quoted above, but, as Prof. Douvillc now points out, this identifi- 

 cation must be regarded as uncertain since the essential characters of Romer's 

 species are not yet known." The finer structure of the outer layers of the shell 

 cannot be taken as a distinguishing feature of Romer's species. 



2)/pe. — Woodward's specimens from Roshcrville are in the British Museum. 



Distribtition. — Zone of Micraster cor-ninjiiiinnn of Rosherville, near Gravesend. 



1 Romer, 'Kreidebild. v. Texas' (1852), p. 77, pi. vi, fig. 1. 



- A few specimens show iudicatious of the ligameutal ridge and appear tt) belong (o the genus 

 Satwagesia, e. g. British Museum No. 33957 from the zone of Holader snhylobosus of Sussex, and No. 

 L. 4842 from the Turonian of Dover. 



