'2^)1 XENOPHOEA. 



Subgenus TUGURIUM, P. Fischer. 

 [Kiener and Fischer, Coq. Yiv. Trochidse, 1880, p. 450.] 



Shell umbilic;ite, foreign substances being agglutinated only in 

 the neighbourhood of the suture ; periphery of the last whorl 

 much prolonged, tectiform. 



Ti/pe. — Xenophora indica, Gmelin. 



Xenophora (Tugurium) tatei, sp. nov. 



[Plate Til. Figs. 7a-J.] 



Shell trochiform, with moderately elevated spire ; whorls broad, 

 seven in number, very small to commence with, but rapidly 

 increasing in size ; the surface of the whorls, as seen between the 

 foreign fragments adhering (mostly in the vicinity of the suture), 

 is irregularly, obliquely undulating and ornamented by closely-set 

 wavy, roughly spiral lineations, which are crossed by more or less 

 conspicuous growth-lines ; the keel at the periphery of the last 

 whorl is sharp and undulating ; the under surface is concave, the 

 depression being most marked near the keel, curved lines of growth 

 are conspicuous ; aperture subquadrate; outer margin thin, strongly 

 curved, deeply concave, and much produced at the margin owing 

 to the prolongation of the last whorl in that region ; inner margin 

 slightly thickened, the thin callosity spreading over as a plate or 

 lining on the inner posterior surface of the aperture ; umbilicus 

 funnel-shaped, small. 



Compared with the European Tertiary X agglutinans, Lamarck, 

 with which it is allied, the Australian species has a relatively 

 higher spire, the whorls are not so flat, and the under surface is 

 narrower; X agglutinam has a much larger umbilicus, whilst its 

 outer margin is not so deeply concave, nor so greatly produced; 

 the ornament of the whorls is different. On the other hand, 

 X. tatei is broader than the European Eocene X conjusa, Deshayes, 

 whilst the latter is not umbilicate. 



Dimensions. — Height 25 mm. ; breadth 44 mm. 



Form, and Loc. — Eocene : Victoria and South Australia. 



G. 4156. Example of the neanic stage of growth, the foreign 

 substances adhering being, for the most part, bryozoa ; from 

 Muddy Creek. Presented ly John Bennant, £sq. 



