82 MELVILI- : NEW SPECIES OF MARINE GASTROPODA. 



Odostomia dorica,*'** n. sp. 



PI. viii, fig. 9. 



O. testa ovato-fusiformi. solidula. crassa, alba, anfractibus 7, (luorum 

 apicales 2 hetcrostr()|)hi, vitrei, excavati, laeves, caeteris apud suturas canal- 

 irulatis, gradalis, dii()l)us sui)L-rni.s longitudinaliter undicjuc multicostulatis, 

 costulis aictis, tribus ultiniis lacvibus, apertura fere rotunda, intus sjiiralitcr 

 striata, labro ad basim crassiore, plica columellari forti. 



Long. 4, lat 2 millim. 



Hah. — Persian Gulf, Maskat, 15 fathoms. 



A solid incrassate s])ecics, somewhat rude in build, coluniflla very 

 strong^' once plaited, whorls very excavate at the sutures, scalate, the apex 

 glassy and heterf)str()phe while the two or three next uppermost whorls 

 exhibit longitudinal riblets, the remaining whorls being quite smooth. 



Oseilla faeeta, n. sp. 



Pi. viii, fig. ID. 



O testa pergracili, angusta, alba, delicata, anfractibus 8 — 9, (juorum 2 

 apicales, heterostrophi, vitrei, laeves, caeteris arete spiraliter acuticarinatis et 

 et tornatis. carinis duabus apud supernos, tribus apud antepenultimum et 

 penultinuim, hltinio anfraclu ad sex carinas, superficie interstitiali laevigata 

 vel obscure sub lenle alveata, apertura ovato-oblonga, labro teniii, columella 

 fortiter uniplicata. 



Long. 3 50. lat. 1.50 millim., sp. max. 

 „ 3 .,1 „ sp. min. 



Hah. — Gulf of Oman. Lat. 24" 58' N, long. 56' 54 E., 156 fathoms. 



At first deemed an attenuate variety of O. imlica, Melv.,"'' a not infre- 

 quent species in these seas, this proposed new form differs in its far more 

 graceful and uniformly narrowed contour, more oval aperture, and stronger 

 columellar plica. Were it not for the presence of this last feature, indeed, 

 it might be considered a CimjaiiiKi, near C. U)<eU, Tryon, which is very 

 abundant in many parts of the North .Vrabian Sea. Irawadia frot^hlearif, 

 (lould, a Rissoid, likewise has a strange superficial resemblance to this 

 alliance of Pi/rai/i hie/I idae in these seas, as we have already mentioned.'^' 



Oseilla joeosa, n. sp. 



PI. viii, fig. II. 



O. testa minuta, ovato-c(jnica, alba, anfractibus 5 — 6, cjuoruni 2 apicales 

 heterostrophi, \itrei, in [ roportione magni, caeteris tri-, ultimo anfractu sex 

 vel septem carinulalis, carinis puullum obtusis, superficie interstitiali sub lente 



5. Doricus, from its severely classic build. 



6. Proc. Mai. Soc. Lond., vol. ii, p. ii2, pi. viii, f. 5. 



7. Proc. 2ool, Soc , looi, pt. II, p. 369, 



