﻿Yol. 64.] GEOLOGY OF BT7EMA. 62/ 



Family Naticid^. 

 SiGAEETFs JAVANus, Martin. 



1879-80. Sigaretusjavanus, Martin, ' Tertiarschichfcen auf Java' p. 80 &pl. xiii, fig. 9. 



Description. — Shell small, wider than high, composed of four 

 whorls. Spire low, depressed, body-whorl very much larger than 

 the preceding. The ornamentation consists of numerous very fine 

 revolving keels of unequal strength, one or more fine ribs being 

 intercalated between two stronger ones, all crossed by irregularly 

 placed growth-striations, giving the shell a somewhat cancellated 

 appearance. Aperture and operculum not observed. 



Remarks. — This species is very similar to, though smaller than, 

 Sigaretus neritoideus, Linne.^ 



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



SiGARETFS Sp. 



A fragmentary specimen, showing fine spiral ribs, appears to be 

 referable to this genus. 



Remarks. — In view of the association of this species with 

 Terehra sp. (q. v.), it seems possible that it is part of Sigaretus neri- 

 toideus, Linne, already found by Dr. Noetling at a corresponding 

 horizon (see above). 



Locality. — South-west of Mindegyi village (Thayetmyo 

 district). 



Natica obsctjea, J. de C. Sowerby. 



1840. Natica ohscura, J. deC. Sowerby, Trans. Geol. Soc. ser. 2, vol. v, pt. ii, p. 328 



& pi. xxvi, fig. 2. 

 1901. Natica ohscura, Noetling, Pal. Ind. n. s. vol. i, no. 3, p. 284 & pi. xix, 



figs. 2-3. 



Remarks. — Specimen determined by reference to the original 

 figure, with which it agrees very well, although it does not appear 

 to correspond with that of Dr. Noetling. 



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

 district) ; a mile north of Toungu (Thayetmyo district). 



Natica (Globulakia) gibbeeosa, Grateloup. (PI. LYII, figs. 2 & 3.) 



1828. Natica gihherosa, Grateloup, 'Tableau (Prodrome) des Coquilles Fossiles 

 Tertiaires de Dax' no. 135 (Bull. Soc. Linn. Bordeaux, vol. ii, p. 151). 



1840. Natica gihherosa, Grateloup, ' Conchy liologie Fossile des Terrains Tertiaires 

 du Bassin de I'Adour ' pi. ix, figs. 1-2. 



1891, 1904. Glohularia gihherosa, Sacco, ' Molluscbi Terziarii del Piemonte, &c.' 

 pt. ix, p. 1 & pi. i, figs. 1-5 ; pt. xxx, pi. xxiii, fig. 11. 



Description. — A single specimen is under observation, and 

 shows a big, fairly-robust shell, not less than 45 millimetres in 

 height, having a large globose body-whorl, covered with more or 

 less regular longitudinal striae. Spire not complete, but short; 

 umbilicus nearly closed by the callous inner lip. 



Remarks. — This species, of which several varieties are known, 



1 NoetHng, Pal. Ind. n. s. vol. i, no. 3 (1901) p. 286 & pi. xix, figs. 6-7. 



