Manchester Memoirs, Vol. xli. (1897), No. 7. 5 



sutures, lower whorls rounded, pale brown, banded with 

 obscure rufous toning at the sutures and middle of the 

 last whorl. Longitudinally costate, costse somewhat 

 noduled at the junction of the spiral lirse, mouth 

 roundish, sinus of the canal broad, lip thickened without, 

 six crenate-dentate within, sutural tooth prominent. Near 

 N. concinna Powis. Two specimens, precisely similar. 



I venture to dedicate this interesting species to Mr. F. 

 W. Townsend, its discoverer. 



Sistrum Rawsoni, sp. nov. (PI. 6, f. 3). 



E. testa ovato-fusiformi, brunneo-castanea, anfractibus octo, 

 quorum tribus apicalibus pallide brunneis, vitreis, Icevissimus, 

 cceteris paullum ventricosis, longitudinaliter laticostatis, costis 

 obtusis, spiraliter crassiliratis, interstitiis transversim tenui- 

 striatis, liris in penultimo et antepenultimo anfractu qnatuor, 

 in ultimo circa octodecim, apertura ovata, labro extus 

 incrassato, iutus rufo-camoso, decent vel undecim denticulato, 

 denticidis albis, nitidis, columella rufo-carnosa, simplice, 

 canali paidlulum producto. 



Long. 15, lat. 7 mm., sp. max. 



Locality. Persian Gulf. Long. 27 N., lat. 52 E. 



A very pretty species, that might almost equally well 

 be considered an Engina; but there are several points 

 of similarity between the shell now before us and S. 

 concatenation Lam. Of a warm chestnut-brown colour, 

 covered with a fugitive epidermis, the whorls eight, three 

 being apical, pale brown, glassy, smooth, the remainder 

 thickly ribbed, and coarsely transversely lirate ; the mouth 

 oval, outer lip thickened, ten or eleven denticled within, 

 the denticles being white, shining, the interstices, with 

 the outer lip and columella, rufous, flesh colour ; canal 

 very slightly produced. 



I venture to associate with this species the name of 

 Sir Rawson W. Rawson, K.C.M.G., so well and uni- 



