RiSSOlDiE. 97 



Sub-Genus IBAVADIA, Blanford. 



J". Asiat. Soc, Bengal, 1S67, p. 56, ti/pe I. ornata, Blf. ; Jide StoUczJca, 

 belongs to sub-fam. RissoincB \_anim. ign.']. 



88. Eissoina [Iravadia] ornata. 



Iravadiii ornata, W. T. Blanford, J. Asiat. Soc, Bengal, 1867, Irawadg 

 Delta. 



30 Pt. Canning: and Iravvady Delta [typical] ; coll. W. T. Blanford 

 and J. Wood-Mason, Esqrs. 



89. Rissoina [Iravadia] trochlearis. 



Eissoina trochlearis, Gould, P. Bost. S. 1861, China Seas — axis 16, diam. 

 '073 poll. ;=R. annulata, Dunker, Japan. 



1 Japan ; ex c. Mr. Damon [coll. A. Adams ; labelled " Onoba cinguli- 



/era, A. Ad."] 

 12 Hona;-Konpr, under stones at extreme low water; coll. R. Hungerford, 



Esq. [4, 2], 

 40 Ceylon, Aden, Bombay, Andamans, Singapore, and Arracan ; coll. 



F. Stoliczka and G. Nevill, Esqrs. 



var. minor. [? dist. sp.] 

 Condi.- Cab. II, pi. 13 B,fig. 2. 



Shell like that of a miniature R. ornata, covered with a thin 

 epidermis. Thick, solid, without the minute, decussating strife 

 of the preceding ; whorls six, the first two without sculpture, 

 the next two with two very sti'ong spiral keels, the fifth witli 

 three, the last of wliich is less developed than the other two, 

 the last with six of these sulcations ; outer lip much thickened, 

 fimbriated [as it were] by five of these projecting sulcae; 

 margins of aperture without any basal notch or canal, joined 

 by a callosity ; columella nearly straight. 



Long. 3j, diam. 1| mil. [Kesm], 

 Long. 3|, diam. 1| mil, [Hong-Kong], 



