180 Mr. W. H. Benson on the genus Alycseus, Gray. 



reflexo, intus superne ad angulum et infra ad basin leviter emar- 



ginato ; umbilico profuudo. Operc. ? 



Diam. major 2\, minor \\, axis \\ mill. 

 Habitat rarissime in valle Rungan. 



Of tins little shell the sole specimen obtained by Mr. Blanford 

 was forwarded to me for examination. Its affinities are with the 

 Khasia A. hebes ; bnt it is perfectly distinct in colour, smaller 

 size, sculpture, narrower constriction behind the ridge, narrower 

 umbilicus, and in the emargination visible within the aperture 

 at the lower part. 



5. A/ycaus plectocheilus, n.s. 



Testa aperte umbilicata, depresso-turbinata, confertim striatula, striis 

 nonnullis ad suturam elevatis, nitente, subpellucida, rufescenti- 

 albida ; spira brevi, depresso-conoidea, apice obtuso, sutura im- 

 pressa ; anfractibus 3^ convexis, ultimo rotundato, profunda con- 

 stricto, tubulum mediocrem gerente, strictura crista angusta elevata, 

 intus cavo-sulcata, peristoma expansum simulante, ab apertura 

 separata ; apertura vix obliqua, subcirculari, peristomate duplici, 

 margine columellari leviter incrassato-reflexo, dextrali valde incras- 

 sato-porrecto, fortiter acutangulatim crispo-plicato, plicis quinque 

 aperturam arctantibus, marginibus callo prominente angulato 

 junctis. Operc. ? 



Diam. major 2^, minor 2, axis vix 2 mill. 



Habitat in valle Rungun. 



The dimensions given are those of the largest of four speci- 

 mens. The strenuously vandyked plication of the incrassate 

 edges of the porrect dextral side of the peristome is a remarkable 

 feature in this minute species. It recalls the curious frill in 

 Pterocyclus bilabiatus, Sow., but in a more exaggerated guise, 

 notwithstanding the smallness of the shell. The edges of the 

 folds are thickened and slightly reflected. Its smaller size, 

 sculpture, and wider umbilicus, and, above all, the mode of 

 constriction, prove that it is not an exaggerated form of crenu- 

 lulus. The deceptive appearance of the ridge or crest at first 

 induced me to class the shell with Diuryx; but a closer investi- 

 gation of the mode in which the ridge was attached to the true 

 peristome, and a view of the internal sulcus, revealed the true 

 position of the species. 



6. Alycaus crenulatus, n. s. 



Testa umbilicata, depresso-turbinata, dense oblique costulata ; spira 

 conoidea, sutura profundiuscula, apice papiilari ; anfractibus 4 

 convexis, ultimo rotvmdato, ad latus inflato, eo eostulis cotifertiori- 

 bus ornato, tum juxta peristoma breviter constricto, Isevi, tubulo 

 suturali elongato non procul ab apertura oriente munito ; aper- 

 tura vix obliqua, circulari ; peristoniatis labro subduplici incras- 



