PTEROCYCLOS $. 1. 51 
5, rotundatis, ultimo non descendente; apertura obliqua, circu- 
lari; perist. duplicato, interno superne breviter inciso, externo 
expanso, supra sinum latiusculo, subcucullato. —  Operc. 
arctispirum , extus concaviusculum, marginibus anfractuum 
laciniatis. — Diam. maj. 15, min. 12, alt. 10 mill.* (H. Ad.) 
Pterocyclos Hainanensis .H. Adams in Proc. Zool. Soc. 1870. p. 8. t. 
1-316: 
Habitat in insula Hainan. (Swinhoe). 
c. Pt. ater Stoliczka. 1 
Pt. testa orbieulato-planorbulari, latissime umbilicata ; 
apice vix exserto; anfractibus quinis, depressiuscule teretibus, 
sutura profunda junctis, liris spiralibus tenuibus, plus minusve 
distincte setiferis, subdistantibus, ornatis, sub epidermide livi- 
dis, transversaliter fulguratim  castaneo notatis, epidermide 
scabriusecula, transversim conferte striata, indutis; ultimo an- 
fractu ad aperturam sensim descendente; apertura obliqua, 
circulari; peristomate duplici, interne paululum cerassieulo, ad 
suturam emarginato, externo tenui, dilatato, supra in alam 
angustam, curvatam atque ad anfr. penultimun leviter affixam 
expanso, pone alam perforato. — Operculum orbiculare, supra 
lamelhs spiralibus exstantibus, distincte denticulatis, composi- 
tum, infra laevigatum, volutionibus angustis spiralibus concen- 
trice minute striatis. — Diam. maj. 16,5, min. 13,5, alt. tot. 
testae 4,2, axis 3,2, diam. diag. apert. cum perist. 6 mill.* (St.) 
Pterocyclus ater Stol. in Journ. As. Soc. Beng, XL. Pt. 2. 1871, p. 149. 
toO 9 
Habitat Kuengan, ad flumen Ataran, prope Moulmein 
(Theobald). 
* 
7. Sumatranus Martens. f III. 42. — Martens in Monatsber. Berl. 
Ak. 1864. p. 116; Ostas. Zool. II. p. 115. — Zssel Moll. Born. p. 
72. — Sumatra, Borneo (Wright). 
s. ? Pt. eudaedaleus Crosse. 1 
».I. latissime umbilicata, subdiscoidea, tenuiuscula sed 
solidula, parum nitida, spiraliter minute striata, luteo- albida, 
strigis numerosis, regulariter fulguratis, castaneis, elegantissime 
ornata; spira depressa, planiuseula, medio vix paululum pro- 
minula, apice obscure violaceo; sutura profunde impressa, 
subcanaliculata; anfr. 4!/, plano-convexiuseuli, ultimus vix 
descendens, rotundatus, strigis castaneis fulguratis, paulo supra 
Zum 
