26 NON-MARINE MOLLUSCS OF SURINAM. 
Nickerie. ten Kate. 
Galibi. ten Kate. 
Surinam River at Paramaribo. Horst, 1907. 
Environs of Paramaribo. van Heurn, 1911. 
Post Groningen. van Heurn, 1911. 
Martens, 1873, pp. 210, 216. Surinam. 
Martens, 1879, p. 118. Surinam. 
Kappler, 1887, p. 203. Surinam. 
* 63. ALCADIA SERICEA Drouet. 
Helicina sericea, Drouet, Moll. terr. et fluv. Guyane franc., 
1859, pid, ES Ut. 1820. 
Alcadia sericea Drou., Wagner, Syst. Conch. Cab., Ed. nov., 
Band I, Abt. 18, neue Folge, 1911, p. 62, T. 10, 
f. 1—A4. 
Environs of Paramaribo. van Heurn, 1911. 
This is the typical A. sericea, the shell-epidermis bearing 
closely set rows of hairs. 
63a. ALCADIA SERICEA Drou., var. KUHNI Pfr. 
Helicina kithni, Pfeiffer, Malakozool. Bl. XIX, 1872, p. 76, 
EB 1412 
Alcadia sericea Drou., var. kithni Pfr., Wagner, Syst. Conch. 
Cab., Ed. nov., Band I, Abt. 18, neue Folge, 1914, 
p. 63, T. 10, f. 5—7. 
Pfeiffer, 1872, p. 76. Bergendal (Upper Surinam 
River). 
Martens, 1873, p. 217. Surinam. 
Wagner, 1911, p. 65. Upper Surinam River. 
64. ALCADIA HISPIDA Pfr. 
Helicina hispida, Pfeiffer, Arch. f. Naturgesch., I, 1839, p. 355. 
Alcadia hispida Pfr., Wagner, Syst. Conch. Cab., Ed. nov., 
Band I, Abt. 18, neue Folge, 1911, p. 55, T. 8, 
f. 8—12. 
Martens, 1873, p. 217. Surinam. 
* 65. LUCIDELLA LIRATA Pfr., var. LAMELLOSA Guppy. 
Helicina lamellosa, Guppy, Ann. Mag. Nat. Hist. (3), XIX, 
1867, p. 260. 
Lucidella lirata Pfr., var. lamellosa Guppy, Wagner, Syst. 
Conch. Cab., Ed. nov., Band I, Abt. 18, neue Folge, 
1911, p. 34, T. 68,404: 
Notes from the Leyden Museum, Vol. XXXVI. 
