50 
PTEROCYCLOS §. 1. 
§• 1 . 
1. tenuilabiatus (Cyclostoma) Metcalfe. (Coll. 1.) I. 45. II. 28. 
ill. 41. — Mart. Ostas. Zool. II. p. 114*). — Patel Cat. p. 119. 
— Issel Moll. Born. p. 72. — Var. minor: Martens in Malak. Bl. 
XX. 1872. p. 156. (Celebes.) — Borneo. 
2. Labuanensis Pfr. (Coll. 2.) III. 41. — Pfr. in Proc. Zool. Soc. 
1863. p. 525; Novit. conch. III. fasc. XXXIII. p. 443. Nr. 588. t. 
98. f. 8 — 10. — Martens Ostas. Zool. II. p. 115. Conf. Martens in 
Malak. Bl. XX. 1872. p. 157. — Patel Cat. p. 119. — Issel Moll. 
Born. p. 73. — Ins. Labuan. 
3. Lowianus Pfr. (Coll. 3.) III. 41. — Pfr. in Proc. Zool. Soc. 1863 p. 526 ; 
Novit. conch. III. fasc. XXXIII. p. 443. Nr. 589. t. 98. f. 11 — 13. 
— Patel 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. Labuan. 
4. Pi microchilus Crosse. 
„T. latissime umbilicata, subdiscoidea, tenuiuscula, longi- 
tudinaliter striatula, sericea, nitidula, olivacea, unicolor; spira 
planiuscula, apice haud prominulo; sutura profunda impressa; 
anfr. 5 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.) 
Pterocyclus microchilus Crosse in Journ. Conch. XVI. 1868. p. 176. 
Habitat in Indo-China? 
O b s. „Species Pt. Lowiano Pfr. aliquantulum vicina , sed paulo 
major, unicolor, caeterum apice planato nec mucronato et peristomate ex- 
terno angustissimo facile distinguenda." 
5. Pt. Hainanensis H. Adams, f 
„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, perpendiculariter striatula, 
pubescens, fulvolutea, superne maculis fulguratis rufocastaneis picta; apex 
rufocastaneus, vix prominens; anfr. 4 1 /2 J sutura profunda discreti, supra pla- 
niusculi, infra convexi, ultimus antice parum descendens ; apertura diagonalis, 
circularis; peristoma duplex, internum lacteum, externum late reflexum, 
tenue, in vivo fuscum, superne in lobum fornicatum anfractui ultimo adnatum 
excurrens. — Operculum calcareum, brunneum, intus paululum concavum, 
spiris circa 6 margine lamelloso, elevato, sulco marginali lato. — Diam. 
maj. 30, min. 22, alt. 13 mill.; apert. lat. = long. 12 mill." 
