﻿Vol. 64.] GEOLOGY OF BURMA. 629 



Cypr^a (Ctpr^dia) elegans, Defiance. (PI. LYII, figs. 7 & 8.) 



1826. Cyprcea elegans, Defrance, Diet. Sci. Nat. vol. xliii, p. 39. 

 1906. Cypradia elegans, Oppenheim, Palseontographica, vol. xxx, pt. iii, p. 303. 

 1903. Cyprcea (Cyprcedia) elegans, Cossmann, ' Essais de Paleoconchologie Com- 

 paree ' livr. v, p. 169 & pi. ix, fig. 8. 



Description. — Shell ventricose, pyriform, covered with strong 

 spiral ribs and finer longitudinal striations, giving to the shell a 

 cancellated appearance. Aperture not central, narrow, curved ; 

 inner lip more than twice the width of the outer. 



Kemarks. — Dr. Cossmann takes C. elegans^ Defrance, as the 

 type of the subgenus Cyprcedia (8wainsou, 1840), to which the 

 present specimen is accordingly referred. The species is known 

 from the Lutetian of the Paris Basin (Cossmann, etc.), while it 

 has been determined from beds of the same age in Italy, Austria, 

 Asia Minor, and Egypt. 



Locality. — Letpan choung, 10 miles east of Sawmyo (Pakokku 

 district). 



Family Cassidid^e. 



Cassidea acanthin^a, sp. nov. (PI. LYII, fig. 1.) 



Description. — Shell very large and robust, spinose, not less 

 than 100 millimetres high, composed of five whorls, the spire low, 

 conical ; body-whorl much expanded, flattening posteriorly towards 

 the suture. The ornamentation consists of abundant revolving 

 striae of unequal strength crossed by abundant curved growth-strise, 

 coarse and fine intermingled, as in the case of the spiral strise. 

 Spines irregular ; inner lip callous, reflected ; outer lip not known, 

 but apparently thickened and reflected. 



E em arks. — According to Dr. Cossmann,^ Cassidea^ Bruguiere, 

 1789, should be substituted for Cassis, Lamarck, 1799, hence its 

 adoption here. Cassidea mammillaris (Grateloup),^ from the Tongrian 

 of the Adour Basin and the Tongrian and Helvetian of Piedmont, 

 appears to be related to this form, which may possibly be identical 

 with C. postmammillaris, Sacco, from the Tortonian of Piedmont.^ 

 Cassidea tuherosa (Linne),* a recent form from Brazil, etc., and re- 

 ported from Japan and the Philippines, appears to be a relative. 



Locality. — A mile and a half north of Lanywa (Pakokku 

 district). 



Pamily Tritonid^. 



DisTORsio CANCELLiNus (Boissy). (PI. LV, fig. 4.) 



1805. Murex cancellinus, Roissy, * Histoire Naturelle des MoUusques ' vol. vi, p. 56. 

 1899. Fersona reticulata, Martin, Samml. Geol. Reichs-Mus. Leideu, n. s. vol. i, 

 p. 145 & pi. xxiii, fig. 336. 



Description. — A single specimen only is under observation; 



1 ' Essais de Paleoconchologie Comparee ' livr. v (1903) p. 123 & pi. v, fig. 10. 

 " ' Conchyliologie Fossile des Terrains Tertiaires du Bassiu de 1' Adour ' 1840, 

 pi. xxxiv, figs. 4 & 19. 



3 For these forms, see F. Sacco, ' Molluschi Terziarii del Piemonte, &c.' 

 pt. vii (1890) pp. 11-17 & pi. i, figs. 3-11. 



4 ' Syst. Nat.' 12th ed. vol. i (1766) p. 1198; & Bruguiere, ' Hist. Nafc. des 

 Vers' (Encycl. Meth.) vol. i (1792) p. 436 & pi. ccccvi, fig. 1, pi. ccccvii, fig. 2. 



