MELVILL : ON GASTROPODA FROM THE PERSIAN GULF, ETC. 55 



Rah.— Persian Gulf, Gulf of Oman, lat. 24° 58':?^., long. 56° 54' E., 

 156 fathoms. 



Distinguished by its mammaeform apex and proportionately large 

 body-whorl, the surface being shagreened by close microscopical spiral 

 liroe crossed by still more minute striae. These two species of Fossarus 

 occurred together, neither very plentifully. 



TURBONILLA ANGUSTISSIMA, n.sp, PI. V, Fig. 13. 



T. testa pergracili, multum attenuata, semipellucida, albo-lactea, 

 anfractibus 11-12, quorum apicales duo-tres conspicue heterostrophi, 

 cseteris apud suturas impressis, ventricosulis, undique longitudinaliter 

 obliquiliratis, lirarum numero anfractum apud ultimum circa 14, 

 apertura ovata, labro tenui, apud basin expanso, columella fere recta. 

 Long. 3, lat. "75 mm. 



Mab.—Fersian Gulf, Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 

 156 fathoms. 



Easily discerned from its congeners by its excessive narrowness of 

 whorl in proportion to its length. The longitudinal lirse are oblique, 

 and not crowded. There are a few other hitherto unknown TurhonillcB 

 sifted from the same dredging that await description, but none so 

 remarkable as T. angustissima. 



Strnola ambagiosa,^ n.sp. PI. Y, Fig. 12. 



S. testa cylindrico - f usiformi, albo - lactea, nitida, subpellucida, 

 anfractibus 8-10, quorum apicales duo vitrei, bulbosi, heterostrophi, 

 cseteris, prsecipue supernis, tumidis, superficie perlaevi, lineis internis 

 spiralibus conspicuis, apertura ovata, labro simplici, columella breviter 

 uniplieata. Long. 3, lat. •75 mm. 



jy-rti.— Persian Gulf, Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 

 156 fathoms. 



Many specimens occurred at the above station of this small, glassy, 

 shining, milk-white species, conspicuous for its remarkably blunt, 

 bulbous, glassy, heterostropheapex, and swollen whorls, giving a sinuous 

 appearance to the Literal contour of the shell, and suggesting the 

 trivial name proposed for it. The opaque internal spiral lineation 

 is also very marked in this species. I know no Si/rfiola very 

 comparable ; it may, however, be slightly akin to Odostomia {Turhonilla) 

 amehcea, Wats.,- from Cape York, .IS". Australia, lo3 fathoms, although 

 this species is acutely carinate. The line of demarcation between 

 the smaller Sijrnoloi and the larger Odostomia is often ill-defined. 



ECTLIMELLA GEDROSICA, n.sp. PLY, Fig. 14. 



E. testa aciculato fusiformi. lactea, tenui, anfractibus 6, quorum 

 apicales duo lactei, Iteves, omnino heterostroplii, cfeteris longis, ad 

 suturas paullum gradatis, sub lente arctissime et delicatissime striatis, 

 fere rectis, apertura oblonga, angusta, labro simplici, columella obliqua. 

 Long. 3'75, lat. 1 mm. 



^ Amhaffionus, sinuous. 



* Cf. Rep. Clialleuger Expedition, xv, p. 405, pi. xxxiii, fig. 1. 



