NKW SPKCIFS OF MAKIXK -SHKLLS FROM CRYLON. 5 



Alt. 5.5. millim. ; diam. maj. 2. Apertmc, alt 1.5 milliin. : diam. .5. 

 HaJ). — Ceylon. 



Rissoina pellueida, n. sp 



PI. i. li-. 17. 



Shell ovately fusiform, ini[)erforate, thin, whirr, transpart-nt : whorls 4 — 5, 



smooth, rather pcjlished ; suture scarcely impressed: peristome simiilc : 



aperture oval. 



Alt. 1.5 millim. : diam. maj. .5. 

 i/rt/'. — Ceylon. 



Rissoina delieatula, n. sp. 

 PI. i, figs. 18— 18a. 

 Shell elongate fusiform, white, whorls 7 — 8, sculptured with numerous \trv 

 fine tranverse costae gradually disappearing on the last half of the hodv whrnl 

 which is finely spirally striate : suture linear ; ])eristome somewhat variruseh 

 thickened ; columella slightl\- ncjtched helow ; ajierture inverseh' auriform. 

 Alt. 6 millim. : diam. maj. 2.25. Aperture, alt. 1.5 millim. : diam .75. 

 Hah. — Celyon. 



Rissoina oseitans, n. sp. 

 IM. i, figs. 19 — ic)a. 

 .Shell elongate subcylindrical, thin, transparent wliite : whorls 6 -7, verv fineh' 

 spirally striate ; suture impressed ; peristome slightly thickened : aperture 

 broad, dilated, o\ate : columella descending somewhat obliijueh' below and 

 extending into a callosit\- which reaches the lip above. 



Alt. 5.75 millim. ; diam. maj. 1.5. Aperture, alt. 1.5 millim : diam. .5. 

 HaJ>. — Ceylon. 



Rissoina (Rissolina) fllieostata, n. sp. 



PI. i, fig. 20. 



Shell elongate p)ramidal, white, whorls 8 — 9, sculptured with somewhat fine 



oblique costae beccjming obsolete on the last half of the body whorl, and 



finel)' spirally striate throughout, the S[)iral striae becoming stonger in that 



region where the costae are obsolete ; suture impiessed ; peristome \aricosely 



thickened : aperture oval : columella notched and much twisted at the base. 



Alt. 5.5 millim : diam. maj. 2. Aperture, alt. 2 millim. : diam. .75. 



Hah. — Ceylon. 



Rissoina (Mopehiella) lanlcaensis, n. sp. 

 PI. i. fig. 21. 

 Shell elongate tusifium, )ellowish white ; whorls 10, the first seven coaisely 

 sculptured with spiral lirae crossed by transverse grooves, presenting a beaded 

 appearance, the lower whorls smooth ; suture deeply impressed above, linear 

 below ; peristome thickened interiorly ; columella slightly notched below : 

 aperture inversely auriform. 



Alt. 10 millim. : diam. maj. 3.5. Aperture, alt. 2 millim. : diam. .75. 

 Hah. — Ceylon. 



Fenella puppureoapieata, n sp. 



PI. i, fig. 22. 



Shell elongate fusiform, yellowish white, the apical whorls tinged with blackish 



