eo 
CCA . 
18'°9.] LAND-SHELLS FROM BORNEO. 341 
Pterocyclos planorbulus, Lam. Encycl. Méth. pl. 461. fig. 3. 
Hab. Borneo? 
OristHororus, Benson. 
22. OpisrHoporuws BICILIATUS, Mousson. 
Pterocyclos biciliatus, Mousson, Moll. v. Java, p. 49, pl. xx. 
fig. 9; Reeve, Conch. Icon. pl. iv. fig. 17 (1863). 
Cyclostoma taylorianum, Pfr. Zeitschr. f. Malak. 1851, p. 7; 
Mart. u. Chemn. Conch.-Cab. ed. ii. p. 288, pl. xxxviti. figs. 27-29. 
Cyclostoma (Pterocyclos) charbonnieri, Récluz, Journ. de Conch. 
1851, p. 214, pl. v. figs. 12, 13. 
Cyclostomus spiniferum, Morelet, Journ. de Conch. 1861, p. 77. 
Opisthoporus latistrigus, v. Martens. 
Cyclotus latistrigus, v. Martens, Monatsber. d. Berlin. Acad. 1864, 
p- 116. 
Opisthoporus euryomphalus, v. Martens (not Pfr.), Preuss. Exp. 
Ost-Asien, Die Landschnecken, p. 111, pl. 1. fig. 6 (1867). 
23. OpisTHOPORUS EURYOMPHALUS, Pfr. 
Cyclostoma (Opisthoporus) euryomphalus, Pfr. P. Z. S. 1856, 
P-da/s 
Pterocyclos euryomphalus, Reeve, Conch. Icon. pl. v. fig. 29 
(1863). 
Compared with type in Cuming Coll., Brit. Mus. 
Opisthoporus pertusus?, Morelet. 
Cyclostoma pertusum, Morelet, Journ. de Conch. ix. p. 177 
(1861). 
Cyclostoma spiniferum, Morelet, Journ. de Conch, ix. p. 177 
(1861). 
24. OpisTHOPORUS PTEROCYCLOIDES, Pfr. (Plate XXXV. figs. 
5, 5a, 5 6.) 
Cyclostoma pterocycloides, Pfr. P. Z. 8. 1854, p. 300. 
Ptergyclos anomalus, Reeve, Conch. Icon. pl. v. fig. 27 (1863). 
Var. quite plain. 
Hab. Niah Hills (A. Everett). 
25. OpIsTHOPORUS BIROSTRIS, Pfr. 
Cyclostoma birostre, Pfr. P. Z.S. 1854, p. 300. 
This species is in Dr. Hungerford’s collection: it does not appear 
to have been figured anywhere. 
Opisthoporus rostellatus, Pfr. 
Cyclostomus rostellatum, Pfr. Zeitschr. f. Malak. 1851, p. 8; 
Mart. u. Chemn. Conch.-Cab. p. 289, pl. xxxviii. figs. 30-34. 
Pterocyclos rostellatus, Reeve, Conch. Icon. pl. v. fig. 25 (1863). 
In Brit. Mus. 
Proc. Zoou. Soc.—1889, No. XXIII. 23 
