M E L A N I A . 



Plate XXV. 



Species 174. (Fig. a, b, c, Mus. Cuming.) 



Melania diadema. Mel. testa ovatd, tenui, inflatd, 

 fnsco-olivaccd, epidermide molli indutd, spird brevius- 

 culd, acute turritd, anfractibus octo, Icevibus, versus 

 apicem lirato-striatis, superne concavo-angulatis, ad 

 angvlum muricato-spinosis, spinis subextrusis ; aper- 

 turd ovatd, columella calloso-effusd. 



The diadem Melania. Shell ovate, thin, inflated, 

 brownish-olive, covered with a soft epidermis, spire 

 rather sharp, sharply turn-led, whorls eight, smooth, 

 ridge-striated towards the apex, sharply concavely 

 angled at the upper part, prickly spined at. the angle, 

 spines somewhat turned outwards; aperture ovate, 

 columella callously effused. 



Lea, Pro. Zool. Soc. 1850, p. 194. 



Hab. Island of Guimaras, Philippines (in small streams) ; 

 Cuming. 



Chiefly distinguished from its more ancient allies by its 

 lighter structure and by the smaller prickly and extruding 

 character of the spiues. 



Species 175. (Fig. a, b, c, d, Mus. Cuming.) 



Melania mitra. Mel. testa ovatd, ventricosd, nigro- 

 fuscd, epidermide molli interdum indutd, anfractibtis 

 paucis, leevibus, superne concavo-angulatis, ad angulum 

 muricato-tuberculatis ; aperturd oblique ovatd, colu- 

 mella calloso-effusd, fauce interdum sanguinolento. 



The mitre Melania. Shell ovate, ventricose, black- 

 brown, sometimes covered with a soft epidermis, 

 whorls few, smooth, sharply concavely angled at the 

 upper part, priekly-tubercled at the angle ; aperture 

 obliquely ovate, columella callously effused, interior 

 sometimes blood-stained. 



Helix mitra, Meuschen, Mus. Gronov. p. 128. n. 1363. 

 Melania thiarella, Lamarck. 



Hab. Point Palmas, Sumatra (in a small river) ; Cuming. 



In this species, which is the largest of the group, the 



prickly tubercles are more regular, and can hardly be said 

 to be prolonged into spines. 



Species 176. (Fig. a, b, Mus. Cuming.) 



Melania cornuta. Mel. testa late ovatd, inflatd, fusco- 

 nigrd, anfractibus paucis, lesvibus, superne late concavo- 

 angulatis, ad angulum tuberculato-spinosis, spinis dis- 

 tantibus, cornutis ; aperturd subquadrato-ovatd, colu- 

 mella calloso-reflexd. 



The horned Melania. Shell broadly ovate, inflated, 

 brown-black, whorls few, smooth, broadly concavely 

 angled at the upper part, tubereularly spined at the 

 angle, spines distant, horned ; aperture somewhat 

 squarely ovate, columella callously reflected. 



Lea, Pro. Zool. Soe. 1850, p. 194. 



Hab. Madagascar. 



Of broader, inflated growth, with the tubercular spines 

 fewer and more distant, and of more horn-like character. 



Species 177. (Mus. Cuming.) 



Melania amarula. Mel. testa ovatd, subventricosd, 

 nigra, anfractibus sex, obsolete spiraliter striatis, su- 

 perne concavo-angulatis, ad angulum conspicue spino- 

 sis : aperturd parviusculd, columella calloso-reflexd. 



The tiara Melania. Shell ovate, somewhat ventri- 

 cose, black, whorls six, obsoletely spirally striated, 

 concavely angled at the upper part, prominently 

 spined at the angle; aperture rather small, columella 

 callously reflected. 



Helix amarula, Linnaeus, Syst. Nat. p. 124'J. 

 Buceinuin amarula, Midler. 

 Bulimus amarula, Bruguiere. 

 Melania amarula, Lamarck. 

 Tiara amarula, Swainson. 



Hab. Mauritius. 



Of smaller size than the preceding species, less inflated, 

 with the spiues more produced. 



January, 1860. 



