NON-MARINE MOLLUSCS OF SURINAM. 23 
Clessin, Syst. Conch. Cab., Ed. nov., Band I, Abt. 17, 
1886, p. 114, T. 12, f. 1749. 
Martens, Festschr. hundertj. Best. Ges. naturf. Fr. 
Berlin, 1873, p. 196, T. 2, f. 8, 9. 
Environs of Paramaribo. van Heurn, 1911. 
A single specimen only was collected. At first sight it 
is distinguished from a specimen of P. guadelupensis, having 
the same size, by its greater regularity in shape and its 
greater number of whorls. It has 6%/, whorls, and a longest 
diameter of 17 m.M. 
* 54, PLANORBIS KUHNERIANUS Cless. 
Planorbis kühnerianus, Clessin, Syst. Conch. Cab., Ed. nov., 
Band I, Abt. 17, 1886, p. 108, T. 11, f. 12. 
Environs of Paramaribo. van Heurn, 1911. 
Clessin, 1886, p. 108. Surinam. 
Only one specimen of this little shell has been found by 
me in Mr. van Heurn’s collection. 
55. PLANORBIS SURINAMENSIS Cless. 
Planorbis surinamensis, Clessin, Syst. Conch. Cab., Ed. nov., 
Band: IE Abt.. 17, 18855. 420 T47, 41. 
Clessin, 1886, p. 126. Environs of Paramaribo. 
* 56. PHysA SOWERBYANA d’Orb. 
Physa sowerbyana, d'Orbigny, Moll. Cuba, I, 1855, p. 190, 
Pl. XIII, f. 44—13. 
Physa rivalis, Sowerby (non Maton et Rackett, 1807), Genera 
of Shells, 14820—24, Limnaea, f. 9. 
Martens, Festschr. hundertj. Best. Ges. naturf. Fr. 
Berlin, 1873, p. 199. 
Environs of Paramaribo. van Heurn, 1911. 
A great number of specimens was collected in the neigh- 
bourhood of Paramaribo. Unfortunately it is not indicated 
on the label if they are found at various places, in order 
to make it possible to explain the differences in size and 
shape. Until I get more specimens of Physa from various 
localities, with careful indications of the physical condi- 
tions they were living in, I feel inclined to consider all the 
Paramaribo-specimens as P. sowerbyana. Some of them are 
INotes from the Leyden Museum, Vol. XXXVI. 
