﻿Yol. 64.] GEOLOGY OP BTJRMA. 623 



MOLLUSCA — Lamellibranchiata. 



Family Ntjculidji;. 

 N'tjcula Alcocki, Ncetling. 



1895. Nucula Alcocki, Noetling, Mem. Geol. Surv. Ind. vol. xxvii, pt. i, p. 8 & 



pi. i, figs. 5-7. 

 1901. Nucula Alcocki, Noetling, Pal. Ind. n. s. vol. i, no. 3, p. 156 & pi. viii, 



figs. 3-5. 



Description. — Shell trigonal, inequilateral, transversely elon- 

 gate, somewhat depressed. Umbo pointed, low, posterior. Margin 

 crenulate. 



The surface exhibits numerous fine radiating striae, each of which 

 corresponds to marginal crenulations, crossed by a few irregularly- 

 placed growth-lines. Escutcheon large, concave, marked off by a 

 rounded keel. Lunule long, narrow, well defined. 



E,emarks. — The specimen under observation agrees with 

 Dr. Noetling's description, except that he interprets the radial 

 striae on the surface as a secondary ornamentation, a view not 

 borne out by the present example. The specimens figured by him 

 appear to be casts only, and the supposed ornamentation of the 

 escutcheon and lunule is probably the result of weathering of the 

 area above the denticles, as in the case of our specimen. Nucula 

 placentina^ Lamarck,^ from the Miocene and Pliocene of Europe, 

 and N. similis, J. Sowerby,^ from the London Clay, appear to be 

 relatives of this form. 



Locality. — 2 miles south of Mindegyi (Thayetmjo district). 



Eamily Aecid^. 

 Aeca Burnesi, D'Archiae & Haime. 



1853. Area Burnesi, D'Archiae & Haime, 'Description des Animaux Fossiles du 

 Groupe Nummulitique de I'lnde ' p. 264 & pi. xxii, figs. 5 a-5 d. 



1901. Area (Anomalocardia) Burnesi, Noetling, Pal. Ind. n. s. vol: i, no. 3, p. 131 

 & pi. v, figs. &-9. 



Localities. — Thayetmyo district: 2 miles east of Toungu : a 

 mile and a half east-north-east of Ngalaingyoung. 



Arc A METABisTEiGATA, Ncetliug. 



1901. Area metahistrigata, Noetling, Pal. Ind. n. s. vol. i, no. 3, p. 139 & pi. vi, 

 fig. 13. 



Locality. — Near Prome, on the eastern bank of the Irawadi. 



Family Pectinidje. 

 Pecten irravadicus, Noetling. 



1895. Pecten cf. Favrei, Noetling, Mem. Geol. Surv. Ind. vol. xxvii, pt. i, p. 7. 

 1901. Pecten irravadicus, Noetling, Pal. Ind. n. s. vol. i, no. 3, p. 121 & nl iv 

 figs. 7-8. ^ ' 



Locality. — A mile north of Toungu (Thayetmyo district). 



1 F. Sacco, • Molluschi Terziarii del Piemonte, &c.' pt. xxvi (1898) p. 46 & 

 pi. X, figs. 35-40. 



2 ' Mineral Conchology ' vol. ii (1828) p. 207 & pi. cxcii, figs. 3, 4, & 10. 



