of some Species of Cyclostomacea. 207 



mediana, et infra earn altera lata castanea cincta ; spira mediocri, 

 turbinata, apice acutiusculo, sutura distincta ; anfractibus 5 con- 

 vexis, celeriter accresceiitibus, ultimo subcarinato, basi convexa ; 

 apertura obliqua, subcirciilari, ampla, latiuscula, intus albida ; 

 peristoinate foniicato-reflexo, interdum incrassato, lutescente, bre- 

 viter adnato, callo parietali superne expansiusculo, angulato-cal- 

 loso, margine columellari leviter sinuato. Operculo paleaceo, 

 crassiusculo,margiiubus anfractuum centralium vix conspicuis, intus 

 umbone minuto munito. 



Diam. major 50, minor 39, axis 28 mill. ; aperturse alt. et lat. (pe- 

 rist. incl.) 29 mill. 



Hab. ad Thyet Myo, raro occurrens. 



Found by Mr, Theobald at the rich locality near the right 

 bank of the Irawadi River, where Hypselostoma tuhiferum, a small 

 variety of Cijcl. fulguratus, and other shells were procured. 



The thick opake operculum forms a contrast with the thin 

 horny translucent one of C falguratus, Pfr. ; both species exhi- 

 bit the central boss which is found in so many of the trans- 

 Gangetic Cyclophori. The operculum of C. Siamensis, Sow., is 

 thin and translucent, the whorls neatly margined, the inner side 

 highly polished, with a minute central umbo. It is transparent 

 and tinged with orange in the centre, and dark chestnut towards 

 the periphery. 



Cyclophorus balteatus, Bens., n. s. 



Testa mediocriter umbilicata, solidiuscula, depresso-turbinata, striata, 

 rugis confertissimis vix undulatis spiralibus superne decussata, 

 basi glabra, saturate castanea, baltea angusta mediana, superne 

 laciniata, et periomphalo lato lacteis ; spira breviter turbinata, 

 apice acutiusculo ; anfractibus 5 convexis, celeriter accrescentibus, 

 penultimo corapressiusculo, ultimo rotundato, subtus convexo, ad 

 suturam planulato, antice sensim descendente ; apertura obliqua, 

 ovato-circulari, intus lactea ; peristomate expanse, in{3equaliter 

 incrassato-reflexo, albido, superne undato, marginibus callo brevi, 

 superne angulato, junctis ; umbilico profundo, extus infundibuli- 

 formi. Operculo ? 



Diam. major 40, minor 30, axis 20 mill. 



Hab. ad Pegu. 



Remarkable for its dark chestnut and milky-white bands, 

 which recall, by their contrast and decided boundaries, the co- 

 louring oi Helix hcemastoma. A few white dots may be observed 

 near the suture of the antepenultimate whorl. A single speci- 

 men has been received for inspection. Perhaps the irregularity 

 of the peristome may not be constant ; but it is so conspicuous, 

 that it has not been deemed advisable to omit it as a specific 

 character. 



