﻿Yol. 64.] GEOLoar of btjema. 641 



Family Plefeotomid^. 



Pleueotoma Stoppanii (?) Deshayes. 



1866. Fleurotoma Stoppanii, Deshayes, ' Description des Animaux sans Vertebres 

 decouverts dans le Bassin de Paris ' vol. iii, p. 382 & pi. xcix, figs. 23-24. 



Description. — Shell fusiform ; spire of about equal length with 

 the body-whorl ; canal not observed. Aperture not preserved, but 

 evidently elongate. The spire consists of seven whorls, slightly 

 angular posteriorly, the angle apparently corresponding to the slit 

 in the outer lip. The ornamentation consists of revolving ribs, faint 

 on the earlier whorls. Body-whorl large, with numerous spiral ribs, 

 not all of equal strength, posteriorly angular, anteriorly with canal, 

 broken in the author's specimen. 



Kemarks. — The true Plewotoma Stoppanii, Deshayes ( = Pl. lati- 

 clavia, Beyrich, according to Dr. A. von Koenen^), is found in the 

 Oligocene of Europe. The horizon of the present form is near the 

 top of the Bassein Group. 



Locality. — A mile south-east of Magyisan (Minbu district). 



Family Conid^. 

 CoNus sp. 



A fairly-robust species, with, faint transverse strise and a short 

 spire. Specimen much crushed. 



Locality. — 2 miles south by east of Magyisan (Minbu district). 



The Eocene species are all new to Burma, with the exception of 

 Ficula Theohaldi, Noetling, known from the Miocene (Pegu Group) : 

 the only hitherto described Bassein species being Velates Schmide- 

 liana (Chemnitz),^ a Middle Eocene form, not found in any of the 

 localities now visited. 



Y. Recapitulation. 



The following appear to be the most important of the new facts 

 brought forward : — 



(1) The presence of marine fossils in the lower part of the Pegu Stage, 



and in particular of the European Miocene (Helvetian-Tortonian) 

 species, Lucina glohulosa, Deshayes. 



(2) The conjunction of northern and southern Burmese Miocene zones (as 



determined by Dr. NoetHng, Pal. Ind. n. s. vol. i, no. 3, 1901, p. 27) 

 in the northern part of the Thayetmyo district. 



(3) The identity of some of the Miocene species from the Letpan choung 



with European lifocene or Oligocene forms. 



(4) The conglomeratic character of the Pegu Group in the Pakokku and 



Lower Chindwin districts. 



(5) The invalidity of the subdivision of the Pegu Group into Promeian 



and Yenangyoungian. 



1 Palaeontographica, vol. xvi, pt. ii (1867) p. 88. 



2 F. Noetling, Eec. Geol. Surv. Ind. vol. xxvii (1894) p. 103 & pi. ii, figs. 1-2. 



