GASTROPODA. 27 



CASSIS D'ARCHIACI, Spec, nov., Plate VI, Fig. i— \b. 

 1853. Cassidaria carinata d'Archiac and Haime, Descr. des Anim. foss. du groupe 



nummulitique de l'Inde, page 317, plate XXXI, fig. i. 



This comparatively small shell consists of six whorls, of which 

 the last one is ventricose, and as the spire is very low, the shell has 

 a sub-globular shape, anteriorly a little attenuated, where it termi- 

 nates in a shortly recurved canal. The last whorl carries three 

 revolving rows of low but pointed tubercles, longitudinally arranged 

 in oblique lines ; besides these the sculpture consists of numerous 

 fine revolving furrows which are crossed by irregular striae of growth; 

 the aperture is longitudinal and narrow ; the inner lip spread over 

 a considerable part of the body whorl, and carries three strong 

 plaits towards the anterior end ; the outer lip has a thickened 

 reflected margin which is rugosely dentate within and leaves some 

 irregular varices on the former whorls, one of which marks the 

 limit up to which the inner lip extends, 



Locality. — Minbu : pretty common. 



Remarks. — Messrs d'Archiac and Haime referred a fragmentary 

 specimen of this species to Cassidaria carinata. Lam. ; the speci- 

 mens from Burma, which are unquestionably identical with the Indian 

 fragment, prove, however, that they must be distinguished not only 

 because they possess a much lower spire, but because the outer 

 as well as the inner lip is denticulated, while it is smooth in 

 Cassidaria carinata, Lam. 



CASSIDARIA DUBIA, Spec, nov., Plate VI, Fig. 2—3. 



The ornamentation of this species shows such marked differences 

 from any others hitherto described that I feel justified in establishing a 

 new species. The sub-globular shell consists of at least six 

 ventricose whorls, which are covered with moderately strong re- 

 volving ribs in such a way, that two ribs of equal strength are separat- 

 ed by a fine one, running right in the middle between the two. The 

 revolving ribs are crossed by fine longitudinal striae which, being a 

 little stronger on the ribs than in the interstices, give them a 



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