38 G. l^e\i\\—List of the Mollusca of [No. 1, 



probably also belong to this form. The nearest figured variety is obesa, 

 Hani., Con. Indica, pi. 44, fig. 7, from the Irawady ; var. savadiensis is of 

 a more ovate shape, of a slightly thinner texture, the nacre is of a light 

 salmon- or cream-colour, instead of the ordinary bluish white tinge charac- 

 teristic* of var. ohesa, the difference of colour in the nacre is constant both 

 in young and old shells ; the lateral teeth are more convex, the cardinal 

 ones a little less strongly developed ; young specimens of both varieties are 

 prominently winged, as in var. lamellatus, pi. 44, fig. 7, of the Con. Indica ; 

 externally young specimens are of a gamboge -yellow colour, tinged with 

 bright green on the wing. 



Long. max. 113, lat. max. 68 mil. 



var. CoREiAis^us, Lea. 



Unio Corriamcs, Lea, Trans. Am. Phil. Soc. V., pi. 9, fig. 25 ; 

 U. marginalis, var. Corriana, Con. Indica, pi. 44, fig. 4. 



Four magnificent specimens of this very marked variety were found at 

 Yaylaymaw ; the nacre is of the most beautiful salmon-pink colour ; the 

 only difference from typical Bengal specimens is that the texture and teeth 

 are thicker, and this is the case also with specimens from Pegu. 



Long. 115, lat. 55 mil. 



Unio Feddeot, Theob. 

 Unio Fedcleni, Theob., J. A. S. B. 1873, pi. 17, fig. 3. 



Tolerably abundant in paddy- swamps at Bhamo, also at Yaylaymaw. 

 I feel quite sure that Mr. Theobald is wrong in recording this species as 

 found in the Pemgunga, Central India ; typical specimens from Mr. Fedden 

 are marked in the carefully kept collection of Mr. H. F. Blanford as from 

 Burmah ; the specimens found by Dr. Anderson in Upper Burmah confirm 

 Mr. Blanford' s record of the locality of the original type form, as opposed 

 to that given by Mr. Theobald ; Mr. Fedden collected in both localities. 



Unio Burmanus, Blf. 



Unio JSurmanus, Blf., P. Z. S., 1869, p. 450 (Bhamo) ; Con. Indica, pi. 42, fig. 1. 



This form was not found on the Second Yunnan Expedition. Full- 

 grown shells are narrower and more produced, with the umbones much less 

 prominent, and the rugose sculpture also less developed than is the case 

 with U. Bhamoensis. 



The types of JJ. Burmanus from Bhamo are in the Indian Museum. 



