GASTROPODA, 19 



by not being perfectly circular ; it has a diameter of 7*75 mm. 

 and a height of only 175 mm. The shell is slightly concave above, 

 but has apparently a deep umbilicus which is, however, filled up with 

 matrix. The whorls, 7 in number, are all in the same plane, flat above 

 and crenulated at the upper and lower edges. The upper and probably 

 also the lower keel which is in a straight line below the upper one, 

 are slightly crenulated by fine transverse striae, otherwise the whorls 

 are smooth. 



Locality. — Yenangyat, very rare. 



Remarks. — Discohelix minuta resembles Discohelix zanclea, 

 Philipps, sp. 1 very much, but it differs materially in some points; the 

 fine transverse striae over the keel are apparently much more widely 

 separated in D. minuta than in D. zanclea ; in the latter species they 

 extend to the outer side of the keel, while in the first one they are 

 restricted to the upper side only, further, the outer side of the body 

 whorl shows two distinct fine revolving striae, while it is perfectly 

 smooth in D. minuta. 



SCALARIA BIRMANICA, Spec, nov., Plate IV, Fig. 9—90. 



The shell is turreted, consisting of more than 10 rounded whorls, 

 which are separated by a deep suture ; the ornamentation consists of 

 strong spiral ribs of considerable breadth which slope anteriorly, while 

 they are steep behind ; the anterior side of the ribs is marked by fine 

 but sharp horizontal striae, which stop abruptly before reaching the 

 posterior side of the longitudinal ribs ; a sharp furrow runs along the 

 base of the whorls, quite close to the suture, so that it is hardly 

 perceptible if the whorls are not separated. 



Locality . — Not very common at Minbu. 



Remarks. — The peculiar ornamentation distinguishes this species 

 easily from others. 



SCALARIA IRREGULARIS, Spec, nov., Plate V, Fig. i— 2a. 



The shell consists of rounded whorls which are not closely united 



but free ; the surface is covered with low longitudinal ribs which are 



1 Enumeratio Molluscorum Siciliae, vol. II, tab. XXVIII, fig. 11. 

 C 2 ( 19 ) 



