Dr. H. Woodward — On Fossil Shells, etc.. from Sumatra. 495 



This species is represented by two casts which agree closely with 

 the Phasianella Oweni, D'Arch. (pi. xxvii. fig. 3, 3a., D'Archiac 

 and Haime, Animaux Fossiles de l'lnde, p. 293), from the Nuinmu- 

 litic Limestone of the Hala Chain, and the compact Chalk-marl of 

 the Salt-range, Punjaub. 



It presents also some slight resemblance to the figures given by 

 Dr. O. Bottger of his Buccinum Pengaronense (Paheontographica : 

 Beitrage zur Natur. der Vorwelt. Suppt. III. Lief. I. 1875, taf. ii. 

 fig. 11a., b. p. 16), from the Nummulitic Limestone of Pengaron. 

 Borneo, and the Eocene formation of Sumatra ; but the form of the 

 aperture differs. 



It might also be compared with Dr. K. Martin's Natica Bandon- 

 gensis, K. Martin, p. 82, tab. xiii. fig. 15 (but not fig. 16), Die 

 Tertiarschichten auf Java, 4to. 1879, from the Tertiary beds of 

 Java. 



Formation and Locality : — The same as that of the preceding 

 species. 



35. Trochus, sp. (casts of). PL XII. Fig. 7. 



This species is represented by three casts. Shell trochiform, with 

 six flattened volutions gradually increasing in size with a distinct 

 suture, and ornamented with from 6 to 7 longitudinal ribs, broader 

 than the spaces which separate them : base expanded, umbilicus 

 deep and conical. 



This shell presents some points of resemblance to the Trochus 

 radiatus, Gmel. (see Dr. K. Martin, Die Tertiarschichten auf Java, 

 1879, Lief. I. p. 72, tab. xii. fig. 16) ; but the outer surface not 

 being preserved in our specimens, it cannot be compared satisfac- 

 torily with this or allied forms. 



Formation and Locality : — The same as the preceding species. 



36. Prenaster, sp. PL XII. Fig. 8a, 86. 



The diagram of an Echinoderm on our Plate (Figs. 8a, 6.) was 

 transmitted with the collection to Prof. T. Rupert Jones, F.E.S., and 

 submitted by him to Dr. Wright, F.E.S. His note has since been 

 mislaid ; the diagram-figure on the Plate only serves therefore to 

 record its occurrence in the Sumatran Tertiaries. 



In a letter lately received from Dr. Wright, he observes : — " In the 

 absence of the specimen, I cannot venture to give a definite opinion 

 about M. Verbeek's Echinoderm. If my memory serves me, when I 

 first saw the diagram, I concluded that it was a Miocene Urchin differing 

 from any that had been figured as coming from Java, and it reminded 

 me of a form I had described from Malta belonging to the genus 

 Prenaster, 1 which comprehends ovoid Urchins with inflated tests, 

 having the ambulacral summit very excentric ; the petaloid ambu- 

 lacra slightly depressed, nearly level with the surface, and very 

 divergent ; often almost perpendicular ; the anteal sulcus is 



1 This observation is extremely interesting, as M. Verbeek had already noticed in 

 Geol. Mag. 1877, p. 444, under head of bed 5, the occurrence of " casts of Gastero- 

 pods and Conchifers, together with Echinidce, comparable with the Eocene forms 

 Prenaster alpinus, Desor, and Periaster sub-globosus, Desor," which Dr. Wright's 

 observation tends to confirm. 



