liS'9.] LAND-SHELLS FROM BORNEO, 341 



^rr^h . Pterocyclos planorbulus, Lam. Encj'cl. Meth. pi. 401. fig. 3. 

 Hab. Borneo 1 



Opisthoporus, Benson. 



22. Opisthoporus biciliatus, Alousson. 



Pterocyclos biciliatus, Mousson, Moll. v. Java, p. 4!), pi. xx. 

 fio;. 9; Reeve, Conch. Icon. pi. iv. fig. 17 (1863). 



Cyclostoma taylorianum, Pfr. Zeitschr. f". Malak. 1851, p. 7; 

 Mart. u. Chemn. Conch. -Cab. ed. ii. p. 288, pi. xxxviii. figs. 27-29. 



Cyclostoma {Pterocyclos) charbonnieri, Recluz, Journ. de Conch. 

 1851, p. 214, pi. V. figs. 12, 13. 



Cyclostomus spiniferum, Morelet, Journ. de Conch. 18G1, p. 177. 



Opisthoporus latistrigus, v. Martens. 



Cyclotus latistrigus, v. Martens, Monatsber. d. Berlin. Acad. 1864,^ ^ 



p. 116. . '■■s.t—' O'^a 



I 



Opisthoporus euryomphalus, v. Martens (not Pfr.), Preuss. Exp. 

 Ost-Asien, Die Landschnecken, p. Ill, pi. 1. fig. 6 (1867). 



23. Opisthoporus euryomphalus, Pfr. 



Cyclostoma {Opisthoporus) euryomphalus, Pf'r. P. Z. S. 18.56, 

 p. 337. 



Pterocyclos euryomphalus. Reeve, Conch. Icon. pi. v. fig. 29 

 (1863). 



Comparpd 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). 



ftn\ V 24. Opisthoporus pterocycloides, Pfr. (Plate XXXV. figs. 

 5, 5 a, 5 b.) 



Cyclostoma pterocycloides, Pfr. P. Z. S. 1854, p. 300. 

 o Pterfiyclos anomahis. Reeve, Conch. Icon. pi. v. fig. 27 (1863). -i 



Var. quite plain, U-o.^'^ a , : ,, 



Hah. Niah Hills {A. Everett). . .- 



25. Opisthoporus birostris, Pfr, 

 Cyclostoma birostre, Pfr. P. Z. S. 1854, p. 300. 

 This species is iu 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, pi. xxxviii. figs. 30-34. 

 Pterocyclos rostellatus, Reeve, Conch. Icon. pi. v, fig. 25 (1863). 

 In Brit. Mus. 



Proc. Zool. Soc— 1889, No. XXIII, 23 



