GASTROPODA. 21 



be noticed. In the figure of d'Archiac's Scalaria subtenuilamella, 

 only the ist and 3rd keels are shown, while the 2nd is not to be 

 seen. As this one is however very ill marked, I am rather inclined 

 to think that it has been left out by some oversight when the figures 

 were drawn. 



TURRITELLA AFFIN1S, d'Archiac, Plate V, Fig. 4-4*. 



1853. Turritella affinis, d'Archiac and Haime, Descr. des Anim. foss. du groupe 

 nummulitique, de l'lnde, page 295, plate XXVII, figs. 16, 

 17, 18, 19. 



Although very common, only fragments have been found, which 

 exhibit the characteristic features of this species so well that 

 there can be no doubt as to their identity. The shell is turreted, 

 consisting of nearly plane whorls,, which are covered with revolving 

 striae ; so far as could be ascertained they are six in number on the 

 earlier whorls, but gradually increase up to nine ; out of these nine 

 striae the lower three are a little detached from the others, and the first 

 and third counting upwards are of nearly double the thickness of the 

 others ; the latter are filiform, equal in strength ; only the uppermost 

 a little thicker than the remainder ; when well preserved the fine longi- 

 tudinal striae may be seen in the interstices separating the revolving 

 lines. Suture, owing to the peculiar sculpture, not well marked. 



Locality. — Minbu and Yenangyat, pretty common. 



Remarks. — According to d'Archiac the sculpture of this species 

 varies a little, but the chief feature of the two strong revolving lines 

 at the base of the whorls is exceedingly well seen in the specimens 

 from Burma; the peculiar feature of the Burma type is, however, that 

 these are separated by a much less stronger cordelette, a character 

 which apparently does not occur with the Indian form. D'Archiac's fig. 

 18. shows a similar feature, although less marked. So far as I am able 

 to say, the specimens from Minbu show this character in a less marked 

 way than those from Yenangyat, but on the whole I do not think 

 that this would establish a distinguishing feature and justify a 

 new name for the specimens from Burma. 



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