NON-MARINE MOLLUSCS OF SURINAM. 21 
* 50. OMALONYX UNGUIS d’Orb. 
Helix (Cochlohydra) unguis, Férussac, in coll. 
Succinea (Omalonyx) unguis, d'Orbigny, Mag. de Zool., 1835, 
p. 2; Moll. Voyage Amér. mérid., 1835—43, p. 229, 
Pl. 22, f. 1—7. 
Martens, Festschr. hundertj. Best. Ges. naturf. Fr. 
Berlin, 1873, p. 193. 
Environs of Paramaribo. van Heurn, 1911. 
Commewijne. van Heurn, 1911. 
Nickerie. van Heurn, 1911. 
Want of means of comparison with specimens from other 
localities in South-America and the Antilles, induces me 
to regard the specimens collected in Surinam as belonging 
to this species, according to Fischer, Journ. de Conch. XXII, 
1874, p. 140, who will reserve the name O. wnguis for 
the continental form, and that of O. guadeloupensis Less. 
for the Antillean one. Possibly the latter species is syno- 
nymous with 0. felinus Guppy from Trinidad, and is only 
a variety of O. wnguis. Lechmere Guppy quotes the locality 
Guyana for 0. wnguis (Journ. of Conch., VII, 1893, p. 221). 
51. PLANORBIS OLIVACEUs Spix. 
Planorbis olivaceus, Spix, Testac. fluviat. Brasil., 1827, p. 26, 
Tease. 9: 
Dunker, Syst. Conch. Cab., Ed. nov., Band I, Abt. 17, 
1886, p. 48, T. 8, f. 22—24. 
Drouet, 1859, p. 42. Surinam. 
When dealing with the next species, I will say my 
opinion on the occurrence of P. olivaceus in Guyana. 
* 52. PLANORBIS GUADELUPENSIS Sow. 
Planorbis guadelupensis, Sowerby, Genera of Shells, 1820— 
24, f. 6. 
Dunkler, Syst. Conch. Cab., Ed. nov., Band 1, Abt. 17, 
1886, p. 50, T. 8, f. 7—9. 
Martens, Festschr. hundertj. Best. Ges. naturf. Fr. 
Berlin,.4873; p..195, T.2, £.-7. 
Planorbis xerampelinus, Drouet, Moll. terr. et fluv. Guyane 
franc., 1859, p. 76, T. 2, f. 27—29. 
Nickerie. Voltz. 
Notes from the Leyden Museum, Vol. XXXVI. 
