﻿630 HE. L. V. DALTO^' OX THE [XoV. I908, 



but the characters are so peculiar and strongly marked, that there 

 is no difficulty in identification, when the fossil is compared with 

 the living shells from Ceylon and the Philippines. 



The spire consists of four or five whorls, all cancellated, the surface 

 being divided into squares, and much distorted, especially the 

 penultimate whorl, which, as well as the body-whorl (though in a 

 less degree), has a vertical furrow at the commencement of the 

 distortion : in the body-whorl this furrow is stronger, and is placed 

 on the left side of and above the aperture, which is canaliculate. 



Remarks. — Following G. TT. Tryon,^ Bistorsio, Bolten, 1798, is 

 adopted for this genus in place of Distortmx, Link, 1807, and 

 Persona, Montfort, 1810. According to Dr. Cossmann, a species 

 allied to Bistorsio eancellinus is found in the recent deposits of 

 Martinique ; ^ and it is on the authority of the same author that the 

 fragmentary form from the recent beds of Java, referred by Dr. K. 

 Martin to Persona reticulata. Linne, is regarded as a synonym. 



Locality. — Shales above the zone of Cytherea erycina, at 

 Padoukbin. 



Family Buccixidje. 



CAXTHAErs Maetzs-iaxits (Noetling). (PL LY, figs. 6 & 7.) 



1895. Ifassa Cautleyi, Xcetling, Mem. Geol. Surv. Ind. vol. xx\'ii, pt. i, p. 32 & 



pi. vii, figs. 2-4:. 

 1901. CanceUaria Martiniana, Xcetline, Pal. Ind. n. s. vol. i, no. 3, p. 332 & pi. xxii, 



figs. 13 a-13 c. 



Description. — Shell elongate-oval; wide canaliculate aperture. 

 Spire not completely seen, but apparently of about equal length 

 with the aperture ; body-whorl with transverse folds and weak 

 spiral ribs, especially on the anterior part. Aperture with much 

 thickened and crenulate outer lip : anterior and short posterior 

 canals, columella with weak transverse plaits. 



Remarks. — The characters of the specimen under examination 

 are identical with those of CanceUaria Martiniana.^ Xoetling, from 

 the base of the 'Tenangyoungian' near Minbu, except for the 

 posterior canal and slightly-stronger transverse folds : the first of 

 these characters easily escapes observation, and the difference 

 of the second is too slight to be of importance. Dr. Xoetling refers 

 to varices which may be observed on the whorls of this species, but 

 none are shown in his figures, nor are any such to be seen on the 

 present specimen. 



The absence of these varices and the presence of a posterior 

 canal would agree perfectly with Tryon's diagnosis of Canthai-us, 

 Bolten,^ to which our specimen is accordingly referred. Of the 

 forms of the same genus, C. polygonus (Lamarck),"^ from the Calcaire 



1 ' Structural & Systematic Conchology ' Philadelphia, vol. ii (1883) p. 124. 



2 'Essais de Paleoconchologie Comparee' hvr. v (1903) p. 105. 



3 Tryon, ' Structural & Systematic Conchologv ' Philadelphia, vol. ii (1883) 

 p. 143. 



4 'Memoire sur les Fossiles des Environs de Paris ' Ann, Mus. Hist. Nat. 

 Paris, Tol. ii (1803) p. 319 & sep. cop. p. 58. 



