50 PTEROCYCLOS $. 1. ! 
gd 
l. tenuilabiatus (Cyclostoma) Metcalfe. (Coll. 1.) I. 45. II. 928. 
III. 41. — Mart. Ostas. Zool. II. p. 114 *). — JZ"átel Cat. p. 119. 
— JIssel Moll. Born. p. 72. — Var. minor: Martens in Malak. BI. 
XX. 1872. p. 156. (Celebes)) — Borneo. 
. Labuanensis Pfr. (Coll 2.) III. 41. —  Pfr. in Proc. Zool. Soc. 
1863. p. 525; Novit. conch. III. fase. XXXIII. p. 443. Nr. 588. t. 
98. f. 8—10. — Martens Ostas. Zool. II. p. 115. Conf. Martens in 
Malak. Bl. XX. 18723. p. 157. — Pütel Cat. p. 119. — Zssel Moll. 
Born. p. 73. — Ins. Labuan. 
3. Lowianus Pfr. (Coll. 3.) III. 41. — Pfr. in Proc. Zool. Soc. 1863 p. 526; 
Novit. conch. III. fase. XXXIII. p. 443. Nr. 589. t. 98. f. 11—18. 
— Pütel Cat. p. 119. — Pterocyclos Loweanus Martens Ostas. Zool. 
II. p. 115. Conf. Martens in Malak. Bl. XX. 1872. p. 157. — 
Issel Moll. Born. p. 72. (An var. tenuilabiati?) — Ins. Labuam. 
[es] 
4. Pt. microchilus Crosse. 
.T. latissime umbilicata, subdiscoidea, tenuiuscula, longi- 
tudinaliter striatula, sericea, nitidula, olivacea, unicolor; spira 
planiuscula, apice haud prominulo; sutura profunda impressa; 
anfr. D convexi, regulariter accrescentes, ultimus teres, vix 
descendens, basi subplanatus; apertura diagonalis, subangulatim 
circularis; perist. duplex: internum brevissime porrectum, 
juxta anfractum contiguum sinuatum, externum angustissimum, 
superne triangulariter vix protractum. — Operculum? — Diam. 
maj. 20, min. 16, alt. 7 mill.* (C.) 
Pterocyelus microchilus Crosse in Journ. Conch. XVI. 1868. p. 176. 
Habitat in Indo-China? 
Obs. Species Pt. Lowiano Pfr. aliquantulum vieina, sed paulo 
major, unicolor, caeterum apice planato nec mucronato et peristomate ex- 
terno angustissimo facile distinguenda.* 
5. Pt. Hainanensis H. Adams. 1 
,P. testa depressa, late umbilicata, tenuiuscula, leviter 
striata, fulvo-lutea, epidermide cornea, laminis distantibus 
dispositis induta; spira paulum elevata, apice prominulo; anfr. 
*) ,'Testa discoidea, latissime umbilicata, perpendieulariter striatula, 
pubescens, fulvolutea, superne maculis fulguratis rufoecastaneis picta; apex 
rufocastaneus, vix prominens; anfr. 4!/;, sutura profunda discreti, supra pla- 
niusculi, infra convexi, ultimus antice parum descendens; apertura diagonalis, 
cireularis; peristoma duplex, internum lacteum, externum late reflexum, 
tenue, in vivo fuseum, superne in lobum fornicatum anfractui ultimo adnatum 
exeurrens. —  Opereulum ealeareum, brunneum, intus paululum concavum, 
spiris cirea 6 margine lamelloso, elevato, sulco marginali lato. — Diam. 
maj. 30, min. 22, alt. 13 mill.; apert. lat. — long. 12 mill.* 
