1862.] Contributions to Indian Malacology. 143 



the typical group. Several species indeed tend to connect these two 

 subdivisions, which more recent discoveries have rendered less dis- 

 tinct than they appeared to be when first described. 

 9. Cyclopiiorus patens, n. s. 

 Testa subanguste urabilicata, globoso-turbinata, nitida, subglabra, 

 oblique striatula, subtilissime decussata, albida, plerumque obsolete 

 fulvo-strigata, fascia unica, 2-3 m.m. lata, nigricante castanea, infra 

 peripheriam circumdata ; rarius superne purpurascenti-castaneo-picta 

 vel strigata, subtus castanea, periomphalo solo albido. Spira eonica 

 apice acutiuscula, sutura impressa. Anfr. 5-5 1 convexi, ultimus ro- 

 tundatus, vix descendens ; umbilicus pervius. Apertura fere vertica- 

 lis, circularis, intus flaveola, peristoma simplex, breviter adnatum, 

 sublate angulatim planulato-expansum, margine columellari reflexum, 

 fulvum, lsete aurantiacum vel flammeum. Operc. distinete 6-spira- 

 tum, corneum, nucleo centrali interno minime prominente 



m.m. inches m.m. inches 



Diam. maj. (exempli majoris,) 38 or 1.5 minoris. 29 or 1.15 

 ,, min. „ 29 1.1 „ 21 0.82 



Alt. 26 1 „ 19 0,75 



Ap. diam. intus, 17 0.6 „ 13 0.5 



Hab. circa Thayet Myo, Prome, et Henzada in provincia Pegu. 

 This species is remarkable for its flat, disk-shaped expanded peris- 

 tome, usually of a bright orange or scarlet colour, and for the absence 

 of marked sculpture, and, in most specimens, of any conspicuous 

 coloration, except a single broad dark chesnut stripe below the peri- 

 phery. 



10, DlPLOMMATINA SPERATA, %. S. 



Testa dextrorsa, non rimata, ovato-conica, subfusiformis, solidius- 

 cula, pallide cornea, subremote verticaliter costulata. Spira eonica, 

 apice acuta, sutura impressa. Anfr. 6^ convexi ; antepenultimus 

 major, tumidus ; ultimus antice vix ascendens. Apertura verticalis, 

 subtus antice sinuata, late auricularis, plica, columellari valida muni- 

 ta ; perist : subduplex, expansum, margine columellari sinuato et ad 

 basin angulo acuto desinente, callo parietali mediocri. 



m.m. ' inch 



Long. 2+ or 0.09 



Diam. H 0.05 



Ap. diam. \ 0.02 



u 



