of some Species 0/ Cyclostomacea. 203 



above the aperture is nearly parallel with the peristome, whereas 

 in A. hebes it looks like a hoop which had fallen backwards on 

 the whorl. In both species it takes its rise at the right side of 

 the peristome, and ends at the suture, corresponding with an 

 intei'ual sulcus. 



Leptopoma Cyheus, Bens., n. s. 



Testa anguste umbilicata, tenui, turbinato-conica, striatula, lineis 

 elevatis remotis spiralibus cincta, albida, strigis castaneis uudulatis 

 picta ; spira conica, apice obtusiusculo, siitura impressa ; anfracti- 

 bus 5 convexinsculis, ultimo acute carinato ; apertura magna \'ix 

 obbqua, subcirculari, superne angulata ; peristomate expanso-re- 

 flexo, margiue columellari sinuato. Operculo corneo, 8-spirato. 



Diam. major 20, minor 16, axis 14 mill. 



Hah. ad Nanclai, raro. Teste W. Theobald. 



The narrow umbilicus is nearly hidden by the reflected peri- 

 stome. A single specimen, in an injured state, has been received. 

 Nanclai is the farthest point to which Leptopoma has been traced 

 to the north-wxst from its eastern focus ; and this species vies 

 in size with its Philippine brethren. It leads to Cyclophorus 

 through Lept. Burmaaum and Cyclophorus expansus, Pl'r. A 

 thin, dead, carinate shell, from Phie Than, on the Tenasserim 

 River, may, in its present condition, be referred either to Lepto- 

 poma, or, as a variety, to the species of Cyclophorus last named, 

 which occurs at the same locality in various states of develop- 

 ment, solid and angulate at the periphery, or thinner with an 

 acute carination. 



Cyclophorus pinnulifer , Bens., n. s. 



Testa late umbilicata, orbicnlato-depressa, radiato-striata, stiiis mi- 

 nutissimis spiralibus decussata, sub epidermide scabra, fusca, albida, 

 superne strigis remotis castaneis radiata ; spira planata, apice vix 

 promiuulo, sutura profunda ; anfractibus 4 convexis, subtus ro- 

 tundatis, ultimo antice latiori ; apertura obliqua, circulari ; peri- 

 stomate leviter expanso, subduplicato, interiori contiuuo, superne 

 ad angulum vix sinuato, exteriori superne alam verticalem sub- 

 fornicatam eflformante. Operc. ? 



Diam. major 13, minor 10, axis 3^ mill. 



Hab. ad Teria Ghat, non raro occurrens. Teste W. Theobald. 



Related to the Sikkim C. Phanotopicus and to C. Calyx of Bur- 

 mah, but more nearly to the latter, from which it is distinguished 

 by its wider last whorl, the absence of any angulation below, 

 and by its more developed peristome. It exhibits a nearer ap- 

 proach to Pterocyclos, through Pterocyclos? or rather Cyclo- 

 phorus brevis, Martyn, and Pt. tenuilabiatus, Mete, than either 

 of those species. Unfortunately the operculum is wanting in 



