'J4G rUOOKKDINGS OF TUK M ALACOI.OGICAT, SOCIKTY. 



iiitorstiti;il lin(>s intorvoniiig. Umbilioiis dcop but iimitow, outer li]) 

 tliiu, ooluiuoUar uiavgiu fairly straight. Wo kuow uo vorv near 

 ooniparablo species. It may bave souie Vanikoroid ebaracters about 

 it ; but I aui eouviucod it is not of that alliance at all, the mouth 

 and pi'ristomatal ebaracters are entirely that of Fosxiinis. 



Maiiuloa tki.amoma. n.sp. IM. Xll, Fig. 12. 



]k[. testa pen'legauter attenuato t'usiformi, palliile straminea, 

 tlelioata, anfraetibus 15, quorum apicales duo lieterostrophi, albi, 

 rugosi, semialveobiti, ea^teris siinilaribus inter se, uudiqne ad suturas 

 impressis. 4 cai'inatis, carina ])rincipali et magis conspicua eentrali, 

 duabus inferioribus utrinque (iispositis, quarta iiiferiore infra, juxta 

 suturas: iuteistitiis bene alveobitis, alveis interdum jtrofuudis, ultimo 

 iufra peripberiam uscjiie ad basim liris (luintjue spiralibus, interstitiis 

 siihalveatis, pnvditis, apertura fere rotunda, hibro tenui, extus 

 dentu'ulato, eolun\ella recta. Long. 13, lat. 3 mm. 



J/tih. — Tersiau (.lulf, Mussandam, at 55 fathoms. 



Terbaps the most graceful Mathilda yet discovered ; perfectly 

 symmetrical and uniforn\ in all its whorls. It comes near to 

 J/, cari/sfia, Mel v., hut dilYers in tbe far greater promiuence of its 

 central keel. 



{reXnuwi; a belt, or zone.) 



AiunKorF:zA ScnnrMANiAXA, n.sp. PI. XII, Fig. 11. 



A. testa miuuta, oblongo - fusit'ormi, nitida, albo - straminea. 

 anfraetibus ad 10, quorum 3.}^ apicales, apice ipso rufescente, parvo, 

 la?vi, iluobus proximis spiraliter uuicarinatis, cantoris apud suturas 

 multum impressis, nitidis, tribus nodularum acutaruni ordinibus 

 spiraliter prfeditis, quorum prima infra, juxta suturas, minus 

 couspicua, intt-rstitiis pernitidis. lanibus, ultimo versus basim spiraliter 

 conspicue eariuulato, apertura ovata, labro tenui, subangulato, 

 columella pauUum excavata, ad basim crassiore, lu'olougatula. Long. 3. 

 <lium. 1 mm. 



Ilah. — Mekran Coast, Cbarbar, 40 fatlioms. 



Tins little species, tbe third of the genus now discovered, is very 

 similar in actual appearance, form, coloration, and glazed aspect of 

 Avborls, to A. din'na, M. & St..' which bas beeu found during tbe 

 past few years to occur commonly in deep water, especially at tbe 

 Avell-kuowu station in the Gulf of Oman at 156 fathoms so often 

 quoted. From this, however, tbe new form differs in tbe possession 

 of three spiral rows of acute nodules or gemma? around the whorls, 

 instead of two only, and likewise by its uniformly smaller size. It 

 is very uncommon, for we have not observed half a dozen examples, 

 it usually occurring singly, while A. dirina is gregarious. As this 

 little species has only been delineated in young condition, we tliink 

 the opportunity a good one for a tigure of the adult shell (PI. XLI, 

 Fig. 10). Its extension of range is luueh increased hy the researches 



' Proc. Zool. Soo. Lond.. June, 1901. p. 37'2. pi. xxi, fig. 3. sp. juv. 



