1873]. W. Theobald — Descriptions of New Species of ZTniomdcs. 209 



viridescente. Testa concentrice striata et rugis plurimis minutis valde ap- 

 proximantibus angulariter seu fulgurate g ranuloso-crispatd, posllce tantuin 

 radiatim granuloso-crispatd. Dentihus cardinalihus hifidis in utrdque valvd, 

 Nacred caerulescenti-alhidd, iridescente. In seniorihus granulationes valde 

 inconspicucefiunt. 



Hah. prope GoioJiatti in Assam.^ 



Zat. 39, alt. 25'5, crass. 18 mm. 



The only other Ifnio that I am acquainted with possessing the peculiar 

 fulgurate and granulose sculpture of this species is U. crispisulcatus, B., 

 and to that group it must be referred, for greatly as the two species at first 

 sight would seem to differ I have little doubt that intermediate forms con- 

 necting them will eventually be discovered. Fig. 4« represents the sculp- 

 ture enlarged and fig. 4 J that of JJ. crispisidcatus, B. for comparison. 



MoifocoNDTLiEA Av^, n. s., PI. XVII, Fig. 5. 



Testd oT)longd, soUdiusculd, antice rotundatd^ postice curvatim trnncatd. 

 Margine ventrali recto ; ligamentali convexo. Umhonibiis decorticatis. 

 JEpidennide piced, in juniorihus luteo-flavescente lineis temUhus ohscure 

 radiatim notatd. Testd incrementi lineis concentrice rugatd, postice plicis 

 paucis raro notatd et valde evanescentihus. Dentihus minimis ut in M. 

 salioeniana. Nacred coerulescente, umhones versus flavescente. 



Hah. prope Mandelay regno Birmanico. 



Lat. 96, alt. 52, crass. 28 mm. 



This species differs considerably from the ordinary forms of M. salweni- 

 ana by its great smoothness and its elongated form. It resembles in the 

 former respect the Philippine M. Gumingi, Lea, and young specimens 

 sometimes exhibit a trace of faint sculpturing along the posterior slope much 

 as in M. inoscularis, Gould, but all the adults I have seen have been quite 

 devoid of sculpture. 



SPHiEEIUM AYANUM, n. s., PI. XVII, Fig. 6. 



Testd quadrate rotundd, tumidd, antice rotundatd, postice trimcatd, dila- 

 tatd, equilaterali. Epidermide, leviter et concentrice corrugatd, ptostice levis- 

 sime radiatd. Umhonibus prominentihus, tumidis, osculantibus ; colore 

 paJlide stramineo, trihus fasciis purpureis wnhonalihus radiatim picto. Li' 

 gamento wnbones versus inflato. 



Hah. prope Ava. 



Lat 7*5, alt. QQ, crass. 5"2 mon. 



A single specimen of this rotund or pisiform species occurred among a 

 number of specimens of Corhicula and other fresh-water shells received from 

 Ava. 



* Obtained by one of the collectors of the Indian Museum. — [Ed.] 



