10. 



Plate II. 



Species 8. (Mus. Cuming.) 



Io funiculata. Io testa abbreviato-f uslforml , nigrescente- 

 olivaced,fi(sco intus quadrifasciatd, anfractibus panels, 

 acute decllelbus, liris angustls, profundi excavatls, un- 

 dlque regulariter funiculatis, ad peripheriam promi- 

 ueute carinatis ; columella bred, aperturd vix canall- 

 culatd. 



The corded Io. Shell shortly fusiform, blackish-olive, 

 four-banded within with brown, whorls few, sharply 

 sloping, regularly corded throughout with narrow 

 deeply excavated ridges, prominently keeled at the 

 periphery, columella short ; aperture scarcely chan- 

 nelled. 



Hab. Alabama. 



The species collected in this Plate are somewhat removed 

 from the type of Io, and yet they have the basal channel, 

 which is the main character of the genus, more or less 

 developed. Io funiculata is of this series the most ab- 

 normal, being distinguished by a sculpture of ridges and 

 grooves, sharp, as if turned by a lathe, very unlike, in its 

 regularity, the plan of sculpture in any other species. 



Species 9. (Fig. a, b, Mus. Cuming.) 



Io Duttoniana. Io testa ovato-fusiformi, Jlavescente-oli- 

 vaced, interdum purpureo-fasciatd, aufractibus sex, 

 concavo-declivibus, supra et ad peripheriam uodulis se- 

 riatim armatis ; columella tenui, vix productd, aper- 

 titrd ovald, late vix cauallculatd. 



Dutton's Io. Shell ovately fusiform, yellowish-olive, 

 sometimes purple-banded, whorls six, concavely slop- 

 ing, armed with a row of nodules above, and at the 

 periphery, columella thin, scarcely produced ; aper- 

 ture ovate, broadly scarcely channelled. 



Melania Duttoniana, Lea, Trans. American Phil. Soc. vol. 

 viii. pi. C. f. 54. 



Hab. United States. 



A rudely-formed shell of rather solid growth, encircled 

 by a chain of nodules next the suture and round the peri- 

 phery, but the nodules are scarcely developed until the 

 last whorl. The basal channel is broad, but only slightly 

 indicated. 



Species 10. (Mus. Cuming.) 

 Io PAGODULA. Io testa ptjramldull-conlcd , vix fusiformi, 



olivaceo-brunned, intus purpurea thictd etfasciatd, au- 

 fractibus panels, concavo-declivibus, ad peripheriam 

 muricato-squamatis, squamh dlstantibus, erectis, pro- 

 mlueutlbus, uufractu ultimo ad basin obscure lirato ; 

 columella arcuatd et lenulter contorto-proditctd, pur- 

 pureo-maculatd. 

 The little pagoda Io. Shell pyramidally conical, 

 scarcely fusiform, olive-brown, stained within with 

 purple, whorls concavely sloping, prickly scaled at 

 the periphery, scales distant, erect, prominent, last 

 whorl obscurely ridged at the base ; columella arched, 

 excavated and thinly twistedly produced, purple- 

 spotted. 

 Melania pagodula, Gould, MS. in Mus. Cuming. 

 Hab. Salwen River, Tavoy, Siam. 



The spur-like armature of this very characteristic form 

 of Io, consists of erect prickly scales, not of solidified no- 

 dules as in the American type. 



Species 11. (Mus. Cuming.) 



Io ARJtlGERA. Io testa obtuse pyramldall, subfusiforml, 

 solidd, Jtavescenle-brunned, anfracllbus concavo-decll- 

 vlbus, superne rude tuber osis, ad peripheriam rude an- 

 gulails et tuberculatls ; columella brevlusculd, aper- 

 titrd pared, subcauallculatd. 

 The armed Io. Shell obtusely pyramidal, slightly fusi- 

 form, solid, yellowish-brown, whorls concavely slop- 

 ing, rudely tuberous at the upper part, rudely angled 

 and tubercled at the periphery ; columella rather 

 short, aperture small, slightly channelled. 

 Melanin armigera, Say, Journ. Acad. Nat. Sci. Philadel- 

 phia, vol. ii. p. 178. 

 Hab. United States. 



Characterized by a peculiar blunt irregular tuberous 

 growth, solidly pyramidal, with the aperture much con- 

 tracted. 



Species 12. (Mus. Cuming.) 



Io ALVEARE. Io testa conoided, solidd, ollvaced, anfrac- 

 llbus oeto, convexo-declivibus, primis oblique rude pli- 

 catis, cateris lavigatis, anfractu ultimo Interdum su- 

 perne plicato-nodulato, Inferue angulato, ad angulum 

 nodulato, delude conspicue spirallter lirato ; apertnrd 

 pared, columella brevi, subcoutorto-canallculatd. 



April, 1860. 



