144 Dr. J. C. Melvill on Marine Mollusca 



Gulf of Oman, 156 fathoms, with which alone it seems com- 

 parable, this little species can easily be recognized by its 

 pinched form, its straight peristome and squarrose aperture, 

 and longitudinal oblique riblets far more close and numerous 

 than obtain in its ally. Both have similarly constructed 

 apical whorls. It only occurred very rarely at the above 

 locality. 



Turbonilla pair uelis, sp. n. (PI. IV. fig. 13.) 



T. testa minuta, gracili, subpellueente, attenuata, nitida; an- 

 fractibus ad ] 4, quorum 3 apicales valide keterostrophi, ceteris 

 suturaliter impressis, ventricosis, longitudinaliter arete costulatis, 

 interstitiis sub lente spiraliter multistriatis, ultimo anfractu ad 

 medium leuiter castaneo-zonato. costulis rectis ; apertura parva, 

 peristomate tenui, columella fere recta. 



Long. 5, lat. 1*25 mm. 



Hab. Gulf of Oman, Charbar, 5 fathoms. 



Resembling T. materna, Melv., but moulded upon an alto- 

 gether smaller and more delicate scale, the whorls being 

 semipellucid, as opposed to the opaque white of the more 

 solid materna, while the longitudinal riblets are proportion- 

 ately more frequent. Around the centre of the riblets runs a 

 very faint spiral chestnut band or line. In this particular it 

 is comparable with T. unicincta, Mel v., than which it is 

 thinner and smaller and more multicostate. 



Turbonilla tliryallis *, sp. n. (PI. IV. fig. 11.) 



T. testa Candida, compacta, uequaquam pellucida, lsevissinia, attenu- 

 ata ; anfractibus ad 15, quorum apicales 2-3 incumbenti-hetero- 

 strophi, ventricosis, ad suturas multum impressis, arete longitu- 

 dinaliter recte costulatis, costulis, simul ac interstitiis, perlaevibus, 

 nuniero anfractum apud ultimum 27, ad basin evanidis ; peri- 

 stomate tenui, columella recta, apertura augusta, squarrosula. 



Long. 7, lat. 1*75 mm. 



Hab. Gulf of Oman, Charbar, 40 fathoms*. 



A very neat and elegant species, pure opaque milky-white, 

 exceedingly smooth and shining throughout, with impressed 

 sutures and ventricose whorls, the longitudinal riblets beiii"- 

 close and numerous — twent\ -seven may be counted on the 

 body-whorl. Labrum and columella straight, mouth quadrate 

 and narrow. 



* GpvaWts, white pith or wiek of a candle, from the fancied resem- 

 blance. 



