56 Contributions to Indian Malacology. [No. 1, 



near Port Dalhousic, on mud between tidemarks. It is a characteristic 

 Assiminia, though much shorter and rounder than the Bengal species 

 A. Francesics, Gray, and belonging in fact to a different section of the 

 genus. It is closely allied to some Singapore species and also to A, 

 niarginata, Leith, which inhabits Bombay, but may be distinguished 

 from all by the double marginal impressed line below the suture. 



The animal is deep red, with a black spot upon each of the lobes 

 into which the proboscis is divided. The eyes are at the top of the 

 short tentacles. 



Family RISSOID^E. 

 Iravadia, n. g. 



Testa imperforata, turrita, spiraliter costata, solicla, epidermide tccta i 

 apertura ovata, integra, antice obsolete effusa ; peristomate recto, extus 

 variciformi-incrassato, intus dilatato. 



Animal"? Operculum f 



Shell imperforate, turrited, spirally ribbed, rather thick, covered 

 with an epidermis. Aperture ovate, without a canal, slightly effusa 

 in front ; peristome straight, not sinuate, with an external varix, and 

 slightly expanded within. Animal and operculum unknown. 

 No. 13, Iravadia ornata, n. sp. PL II. fig. 13. 14. 



Testa turrita, decollata, subcylindrica, (junior elongato-conica), 

 solida, spiraliter costata, inter costas confertim verticaliter costulata, sub 

 epidermide olivaced vel ferrugined albida. Anfr. superst. 3-4, rotun- 

 dati, superi tribus, penidtimus quatuor, ultimus sex costis spiralibus 

 ornati, hoc juxta aperturam paulo ascendente. Apertura sub-verticalis, 

 elliptica, intus alba, (in testa juniori postice angidata), antice subangu- 

 lata et in testa adidtd obsolete effusa, in juniori subcanaliculata ; 

 peristoma extus incrassaticm, nodoso-variciforme, nodis costis spiralibus 

 congruentibus, intus vix expansum. Operc. f 



Long. 4J, diam. 2J mill. 



Shell turrited, decollated (the young shell elongately conical,) thick, 

 spirally ridged, with close vertical costulation between the ridges, 

 white, with a brownish or olive epidermis. Whorls apparently about 

 6, when perfect, but only 3 or 4 remain in all the specimens collected ; 

 body whorl with 6 spiral ribs, of which 4 only appear on the penul- 

 timate whorl, and 3 on the upper whorls, the lower ribs being con- 

 cealed. On all the upper whorls the 2nd and 3rd ridges are the 



