302 Messrs. J. C. Melvill and R. Standen on 
Erato recondita*, sp.n. (PI. XXI. fig. 9.) 
E. testa parva, nitida, alba, levissima, tenui; anfractibus 53, 
apicali obtuso, mamillato, ceteris levibus, immaculatis, ultimo 
magnopere exsuperante ; apertura angusta, labro supra paullum 
effuso, nitido, albo, incrassato, intus minute denticulato. 
Long. 5, lat. 3 mm. (sp. maj.). 
Hab. Gulf of Oman, lat. 24° 58’ N., long. 56° 54’ E., 
156 fathoms. 
Var. (vel sp.?) haplochila, nov. (PI. XXI. fig. 10.) 
E. testa ut supra, sed labro intus simplici, plano, nequaquam 
denticulato. 
Hab. Gulf of Oman, cum precedente. 
Although this var. is not denticulate in the inner side of 
the lip, we cannot disassociate the two forms of this in- 
teresting Hrato. It is evidently benthal in its habit, and 
the discovery of more specimens may furnish links to bind 
these two forms yet closer together. 
Eulima decagyra, sp.n. (PI. XXI. fig. 11.) 
E. testa minutissima, candida, polita, fusiformi, superne multum 
attenuata; anfractibus 10, apicali obtuso, diaphano, pernitido, 
ceeteris applanatis, politis, ultimo basim versus oyato, solidius- 
culo; apertura parva, ovata, labro paullum incrassato; columella 
declivi, apud basim angulatim incrassata, nitida. 
Long. 2°75, lat. 1 mm. 
Hab. Gulf of Oman, lat. 24° 58’ N., long. 56° 54! E., 
156 fathoms. 
A shining, white, polished species, noteworthy for its 
gradually attenuate spire, ovate thickened base, and aperture 
proportionately small. We do not know any Hulima exactly 
comparable nor, we may add,so minute. We are indebted to 
Mr. Sykes for having extricated two examples from a mass 
of shell-sand. 
Rissoina isosceles +, sp.n. (Pl. X XI. fig. 12.) 
R. testa eleganter attenuato-fusiformi, cinereo-alba, solidula; an- 
fractibus 9, quorum 3 apicales hyalini, bulboso-globulares, 
ceteris longitudinaliter arcte costulatis, apud supernos magis 
fortibus, paucioribus, undique sub lente spiraliter tenuissime 
striatis, infra peripheriam ultimi anfractus angulatam eyanidis ; 
* Reconditus, hidden. 
Tt icockedjs, from the basal shouldered angles. 
