' MELVILL AND POIfSONRY : SHELLS FROM THE H.VDRAM.vrT. 3 



oclireo-fulvoiis colour, a reddish band encircling the middle of the 

 : last whorl, which, in common with the npper whorls, is striatulate 

 above. The lower portion, however, towards the base, is quite 

 smooth and shining. It differs from 0. Bentiamim, Melv. (Proc. Mai. 

 Soc, Vol. I, p. 224), in being globosely conical, not orbicularly 

 depressed in form, and in having the peristome less effuse. 



6. Planorbls Arabicus, n.sp. PI. I, Figs. 15-17. 



P. testa ochraceo-cincrea, teniii, parum nitente, loevigata, sub 

 lente tenuissime obliquistriata, anfractibus quatuor, ventricosulis, 

 lente crescentibus, disco superiore multum excavato, iuferiore magis 

 applanato, apertura lunata. Long. 5, lat. 12 mm. 



Hah.—Dhoiiiw 



An ordinary-looking shell, but not exactly to be matched, when 

 compared with the other species of the genus. Ten or twelve 

 specimens. 



7. Paludestrina glaucovirexs, n.sp. PI. I, Fig. 8. 



P. testa minuta, oblonga, vix rimata, subpellucida, anfractibus 

 quatuor vel quinque, ventricosulis, sub lente indistinctissime trans- 

 versim liratis, apertura ovata, peristomate simplice, continuo. Long. 2, 

 lat. 1mm. 



Hah.—DXxoiAv. 



A very minute, insignificant little shell, of which three specimens 

 were collected. These are to some extent eroded on the last whorl ; 

 the colour is olive-glaucous-green. The whorls, under a very strong 

 lens, appear in certain lights to be very obscurely transversely striate, 

 but this appearance is only observed when the shells are viewed at 

 a particular angle. The mouth is ovate, the peristome simple and 

 continuous ; whorls four to five, slightly ventricose. 



EXPLAXATION OF PLATE I. 



Fir.s. 1-3. Otoponia Hadi'amauticum, u.sp. 



,, Z(i. (Operculum). 



,, 4. Steno.o-yra Bentiffi, n sp. 



,, 5-7. Otopoma consimile, n.sp. 



8. Paludestrina .ii'laueovireus, n.sp. 



,, 9-11. Otopoma Dhofareuse, n.sp. 



12-14. Hyalinia (Arnouldia) eremias, u.sp. 



,, 15-17. Plauorbis Arabicu.s, n.sp. 



