1871.] F. Stoliczka — Notes on terrestrial Molluscs. 149 



Habitat : Damotha, prope Moulmein ; raro. 



This species resembles in its colouring Pterocyclus Fedclcni, Blf., 

 but is easily distinguished from it by its thinner and very gradu- 

 ally increasing whorls. The tubular form of these also readily 

 separates the present species from Cycl. calyx which has the basal 

 angulation always distinct. The only other allied species is Ptero- 

 cyclus cetra, Benson, which differs by the well developed upper 

 wing of the aperture. In Inylisianus the margin of the aperture 

 is simply insinuated, and externally very slightly thickened. 



I have associated with this interesting new form the name 

 of J. "W". Inglis, Esq., Executive Engineer at Moulmein, who has 

 most kindly aided me in my conchological inquiries about that 

 station. 



Pterocyclus ater, StoL, pi. vi, fig. 2. 



Pt. testa orbiculato planorbulari, latissime umbilicata ; apice vix 

 exserto ; anfractibus quinis, depressiuscule teretibus,sutura profunda 

 junctis, liris spiralibus tenuibus, plus minusve distincte setiferis, 

 subdistantibus, ornatis, sub epiclermide lividis, transversaliter 

 fulguratim castaneo notatis, epidermide scabriuscula, transversim 

 conferte striata, indutis ; ultimo anfractu ad aperturam sensim 

 descendente ; apertura obliqua, circulari, peristomate duplici, in- 

 terno paululum crassiculo, ad suturam emarginato, externo tenui, 

 dilatato, supra in alam angustam, curvatam, atque ad anf. pen- 

 ultinum leviter amxam expanso, pone alam perforato. Diam. maj. 

 16-5, d. min. 13-5, alt. tot. testse 7-2, axis 3% diam. diag. apert. 

 cum perist. 6 mm. 



Operculum orbiculare, supra lamellis spiralibus exstantibus, dis- 

 tincte denticulatis, compositum, infra lsevigatum, volutionibus 

 angustis spiralibus concentrice minute striatis. 



Animal fere uniforme atrum, corpore supra, tentaculis ad termi- 

 nationem et pede lateraliter admarginem inferiorem paulo palidori- 

 bus ; forma ab ceteris speciebus ejusdem generis hand distincta. 



Hal. Kuengan, ad flumen Ataran, prope Moulmein ; cepit The- 

 obald. 



This is a very interesting planorboid and spirally lirated species. 

 The outer lip is at the suture produced in a narrow obtuse wing, 



