GASTROPODA. 33 



longitudinal ribs, which are crossed by fine filiform striae, chiefly 

 marked towards the base and the top of the whorls — are well repre- 

 sented in the specimens from Burma. 



Nassa cautleyi is apparently closely related to Nassa siquijoren* 

 sis, Ad., from Java. K. Martin describes this species in detail, but 

 to judge from his figures, it must vary very much in appearance. 

 Without having the originals before me, I am unable to form an 

 opinion whether these different forms should be united under the same 

 specific name or not. The species from Burma certainly shows no 

 such varieties ; on the contrary, its characters remain most uniform ; 

 Fig. 119 of those given by Prof. Martin shows the closest agree- 

 ment with our specimens ; the only difference apparently consists 

 in the shell being a little more ventricose, and the longitudinal ribs 

 more numerous and finer. 



CLAVELLA DJOCDJOCART^, K. Martin, sp. s Plate VII, Fig. 5-7*. 



1883—87. Pusio djocdjocartae, K. Martin, Beitrage zur Geologie Ost-Asiens und 



Australiens, vol. Ill, page 104, plate VI, -fig. 105. 



Although one of the commonest species not a single specimen 

 is completely preserved, but from the numerous fragments it is easy 

 to fix the characters. The shell is sub-fusiform, and consists of at 

 least seven whorls, of which the last one is suddenly contracted in 

 front ; the spire is acuminate, and its whorls have a different sculpture 

 from the last one ; on the earlier whorls broad but low longitudinal 

 ribs may be seen, which produce a kind of undulating suture ; these 

 ribs of which there are six to one whorl, become obsolete the larger 

 the shell grows, and have entirely disappeared on the last whorl; the 

 latter shows only finely engraved revolving lines which are also pre- 

 sent on the spire, arranged in two sets in such a way that the central 

 part remains smooth ; anteriorly the lines are much stronger, in fact 

 fine revolving ribs are produced; those on t^e posterior part remain 

 always fine, and become easily effaced.*; the aperture is small, ellip- 

 tical and has a short posterior and a very long anterior canal ; the 

 D ( 33 ) 



