160 Descriptions of marine Gastropoda from Ceylon, fyc. [No. 3, 



position of the above sub-genus. Thalotia appears to be the one to 

 which it is next allied, though the general form, sculpture and sub- 

 stance are very far removed from any species of that genus with which 

 we are acquainted. 



Tallorbis roseola— N. S., PL, XVII, Fig. 5. 



T. depresso-conica ; anfractibus quints, in latitudine rapide crescen- 

 tibus, suturis profundis sejunctis, spiraliter distanter costulatis : costulis 

 in anfractu penultimo tribus ; omninis distantibus, tuberculis numerosis, 

 roseis eleganter ornatis, interstiis latis, una stria spirali in medio divisis, 

 transversaliter cancellatis ; basi convexa, similariter ornata ; apertura 

 ampla, subrotundata, margaritacea, intus in adultis spjeciminibus Icevi, 

 in junioribus sulcata : labro liaud incrassato, ad marginem crenulato, 

 labio tenui ; columella antice incrassata, subreflexa, plicis tribus, tortis 

 instructa. 



Alt. Ill Mil.—JDiam. maj. 11 Mil. 



Very rare ; — S. Prov. Ceylon. 



Pisulina— N. a. 



T. crassiuscida, polita, semi-globosa, neritiformis, spird brevi, apertura 

 sub-orbiculari, integrd, Jiaud umbilicatd instructa ; labio columellari 

 applanato, calloso, in medio dentiforme dilatato, labro simplici. 



This genus approximates so closely to Calceolina of A. Adams, that 

 we entertained doubts, as to whether it was desirable to separate it, the 

 remarkable protuberance of the inner columellar lip, however, decided 

 us on doing so, though, until the animals and opercula (if any ?) 

 have been carefully examined, we shall feel some doubts, as to whether 

 both of them are not mere sections of Teinostoma. 



Pisulina Adamsiana— N. s., Pi. XVII, Fig. 4. 



T. parva, alba, Icevis, solida ; spira obtusa ; anfractibus auaternis, 

 superis interne, sicut in speciviinibus Neritarum, evanidis ; sutura 

 indistincta ; labio colimiellari calloso, polito, leevi, denticido lato, 

 depresso ad medium munito ; labro intus paululwm incrassato, pjolito, 

 ad marginem acuto. 



Alt. 4J Mil. — Diam. maj. 4 Mil. 



Dead, on the sands ; S. Prov. Ceylon. 



We have named the above interesting little species after Mr. Henry 

 Adams, who has most kindly given us much valuable assistance and 

 aid, besides describing many of our new Mascarene shells. 



