408 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 
this form as a true Zuspira on account of the elevated character of 
the whorls. 
8. Atarra cf. trrrma (Phillips). 
Rostellaria trifida, J. Phillips: Illustrations of the Geology of Yorkshire, 
1829, p. 138, pl. v, fig. 14. 
Alaria cf. trifida, Vogel: Samml. geol. R.-Mus. Leiden, vol. vi (1900), 
p. 71, pl. iv, figs. 7-9. 
Two badly preserved Gastropods found in the red-clay beds appear 
to be referable to this form as recognized by Dr. Vogel. 
9. Lunarra Sampasana (F. Vogel). 
Amauropsis (?) Sambasana, F. Vogel: Samml. geol. R.-Mus. Leiden, 
vol. v (1896), p. 149, pl. x, figs. 9, 10. 
Lunatia Sambasana, Vogel: op. cit., vol. vi(1900), p. 67, pl. iv, fig. 6. 
There is only one example of this species, which is of large size, 
measuring 28 by 18 millimetres. It possesses a fractured labrum ; 
but its somewhat narrow form, well-developed spire, long body-whorl, 
and apertural characters agree in all essentials with Vogel’s figures. 
A still larger specimen, which most probably belongs to this species, 
is much worn and contorted. Both were obtained from the red-clay 
ferruginous deposits. 
10. Psrvpometanta cf. aABBREVIATA, F. A. Roemer. 
Pseudomelania abbreviata, Roemer: Verstein. nord. Oolithengeb. 
Hannover, 1836, p. 159, pl. x, fig. 4. 
Pseudomelania cf. abbreviata, Vogel: Samml. geol. R.-Mus. Leiden, 
vol. vi (1900), p. 68, pl. v, figs. 1-3. 
Represented by two specimens, one of which is only a fragment 
of the spire. The more perfect example corresponds with Vogel’s 
account and figure of this shell, although somewhat smaller in size. 
They occur in the ferruginous red-clay beds. 
11. Exettssa sepremcostata, F. Vogel. 
Exelissa septemeostata, Vogel: Samml. geol. R.-Mus. Leiden, vol. v 
(1896), p. 146, pl. x, figs. 4-6 ; vol. vi(1900), p. 66, pl. v, fig. 7. 
The collection contains two examples of this species which, although 
not showing basal characters, exhibit the thick and prominent 
longitudinal coste. They were found associated with, casts of 
Protocardia crassicostata in the pyritized siliceo-calcareous rock. 
Previous observers are inclined to regard this fauna as of Upper 
Oolitic or ‘ Weisser Jura’ age, although its general facies is suggestive 
of an older period. The Perisphinctes described by Martin from 
Bengkagang in Sambas is stated to possess obscure ribs, which may 
be single or bifurcating, with smaller ones intervening, i.e. a long 
and a short rib alternating. Such characters scarcely apply to the 
biplicated forms of this genus belonging to Portlandian times, which 
exhibit definite bifurcation without evidence of minor intermediate 
ribbing. The mere obscurity of the bifurcating costee accompanied by 
intervening ribs, such as characterise a form like P. Martinsi, would 
