1894.] LAND-SHELLS FROM THE SAMUI ISLANDS. 155 



ram valde constrietus, turn campanidatus, sublcevigatus, in media 

 parte laevigata obtuse cristatus. Apertura diagonalis, subcircu- 

 laris ; peristoma dwplex, externum sat expansum, internum 

 continuum, valde porrectum incrassatulum, superne et basi 

 effusum et subcanaliculatum. 

 Diam. maj. 2*25, min. 1'75, alt. 1*2 millim. 

 Evidently a near ally of the small Perak species, such as A. micro- 

 discus, m., but at once distinguished by the peculiar grooves near 

 the upper insertion and at the base of the peristome. 



29. Diplommatina (Sinica) samuiana, sp. nov. (Plate XVI. 

 figs. 18, 19.) 



T. dextrorsa, elongate ovato-conica, confertim coslulata, pallide 

 cornea. Anfr. 7, modice convcxi, superi 5 spiram subregulariter 

 conicam efficientes ; pemdtimus magnus ; ultimus angustior, paid- 

 lum distortus, initio constrietus, antice ascendens. Apertura 

 verticalis, subcircidaris ; peristoma duplex, externum modice 

 expansum, superne interruptum, internum incrassatulum, sat 

 porrectum, basi columella angidum distinctum formans. 

 Lamella columellaris humilis, palatalis longiuscida, subhorizon- 

 talis, supra columellam conspicua. 



Alt. 2*5, diam. 1*33 millim. 



Pam. PuPiNlDJE. 



30. Pupina aktata, Bens. 



31. Pupina pallens, sp. nov. (Plate XVI. figs. 27, 28.) 



T. conoideo-ovata, Icevis, nitens, pallide corneo-brunnea. Anfr. 6, 

 convexiusculi ; ultimus sat distortus, supra aperturam applanatus, 

 antice breviter ascendens. Apertura paullum retrorsum incli- 

 nata, circidaris ; peristoma expansiusculum, liaud rejlexum, 

 margo externus ad insertionem attenuatus, recedens cum lamella 

 parietali triangidari valida 'Canalem superum formans, basalis 

 et columellaris incrassati et dilatati. Canalis inferus angustus, 

 liorizontalis, pjostice in foramen subcirexdare desinens. 

 Alt. 8, diam. 5*5 millim. 



This somewhat difficult form agrees in size with P. arida, Bens., 

 of Perak and Tenasserim, but differs in the more obtuse spire, the 

 more distorted last whorl, and consequently the aperture placed 

 more to the right and protracted at the base, the thinner outer 

 peristome, the broader columella, the broad triangular parietal 

 lamella, and the narrower lower incision. 



Fain. Hydroc.enid^e. 



32. Georissa monterosatiana, ISTev. et G.-A. 



Wubsp. nov. SAMUIANA. — Minor, anfr. magis convcxis. Alt. 



2"5, diam. 1*5 millim. 

 A slight modificatiou of the Perak type. 



