72 University of Michigan 



"Shuttleworth" Clessin (op. cit., p. 211, fig. xxxii-6) ; Sowerby (1878; 

 Couch. Icon., XX, fig. vi-48). Planorhis sp. ? Smith (1898; Proc .Mai. 

 See, III, 113) ; first Curasao record of genus; collected by Hartert. 



Type locality : Jamaica. 



Distribution: Jamaica, Haiti, Porto Rico, St. Thomas. 

 Curagao : cement tank in front of Landhuis Wilhelmina 

 (Cc2) ; dammed pool on northwest side of Seroe Papaja 

 (Cell; dead shells only); dammed pool, Campo Lagoen 

 (Ccl7). Bonaire: Pos Baca (Bel), The water in all of these 

 places is slightly brackish to the taste, but it is used for stock 

 animals ; that from the first is quite drinkable. 



Measurements*'^ 



Shell Aperture "Whorls 



alt. maj. diam. min. diam. alt. diam. 



P. pallidus 



Adams (1846) 3.2 320(10.2) S(sic) 



Clessin (1884) 2.3 370( 8.5) 4 



P. circumlineatus 



Clessin 2.5 360 ( 9.0) 4-5 



P. weilandi 



Pfr. (1876) 2.5 320( 8.0) 220(5.5) (3.0) 4 



P. huhnianus 



Clessin 2.0 325 ( 6.5) 4 



P. meridaensis 



Preston 2.7 300( 8.0) 110(3.0) 1.5(sic) 3^^ 



Ccl7(largest) 3.0 355(10.6) 285(8.6) 120(3.6) 110(4.0) 5 



2.9 300( 8.7) 255(7.4) 120(3.5) 110(3.9) 4^ 



Bel (largest) 2.6 360( 9.4) 310(8.1)' 130(3.4) 115(3.9) 4^^ 



Ccl. Quite abundant (33 specimens collected). Thin, transparent and 

 rather small. As the tank is artificial and its water supply comes from a 

 well, the shells must have been introduced by some extraordinary means 

 of dispersal. 



Cell. (6 dead shells collected). Opaque and rather heavy; similar 

 to the next lot. 



Ccl7. Infrequent (3 living and 15 dead shells). Large, rather heavy 



41 The altitude in my measurements is that opposite the aperture ; from 

 their figures, this seems to correspond most closely with that used by the 

 older writers. The altitude given for P. meridaensis is estimated from 

 the figure. 



