Fig. 
Fig. 
EXPLANATION OF PLATES. 667 
PLATE XX. 
[Most of the figures are a little enlarged, the natural size indicated by the vertical line. ] 
1. Physa (Aplecta) impluviata, Morel. (p. 358), Dueifias. 
2, 3. ( ) , var. leta, n. (p. 859), Vera Paz (Tristram’s P. aurantia). 
4. —— (Stenophysa) nicaraguana, Morel. (p. 366), Lake of Nicaragua, from a drawing of 
Morelet’s type-specimen made by E. Smith: 4 a, back view. 
5, 6. (Aplecta) fuliginea, Morel., var. hoffmanni, n. (p. 360), Laguna Redonda, two 
somewhat different specimens from the same locality : 5 a, back view. 
7. (Stenophysa) obtusa, Cless. (p. 368), Honduras, type-specimen in Clessin’s collection : 
7 a, back view. 
8. ( ) panamensis, Meg. (p. 365), Panama, type-specimen from Anton’s collection, 
now in the Dresden Museum. 
9, 10. (Aplecta) cisternina, Morel., var. minor, Fisch. & Cr. (p. 362), San Antonio, two 
somewhat different specimens from the same locality. 
Ti, Y2. ( ) fuliginea, Morel., var. plicu/osa, nu. (p. 8361), Rio Reventazon, two some- 
what different specimens from the same locality: 11a, back view. 
18. —— (Alampetis) osculans, Hald., var. mexicana, Phil. (p. 370), City of Mexico, obtained 
by Deppe. 
14, 15. ——— (——) polakowskyi, Cless. (p. 374), City of Guatemala, typical specimens in the 
Berlin Museum, 7. 
16. (——) berendti, Fisch. & Cr., var. minima, v. Mart. (p. 372), Orizaba, 3. 
17. —— { ) osculans, Hald., var. coniformis, Strebel (p. 371), Lake of Patzcuaro, obtained 
by Uhde. 
18. ( ) , var. boucardi, Cr. & Fisch. (p. 371), Mexico, obtained by Deppe, #. 
N.B.—In this figure the line indicating the natural size, 15 millim., has been accidentally 
omitted. 
PLATE XXI. 
[All the figures of Planorbis in three views : in those which are enlarged the middle 
figure indicates the natural size. ] 
1. Planorbis tenuis, Dunk. (p. 381), City of Mexico, obtained by Uhde. 
2. , var. uhdei, n. (p. 385), Central Mexico. 
3. —— , var. applanatus, nu. (p. 384), Plateau of Mexico. 
4, —— , var. juvenilis, n. (p. 884), City of Mexico. 
5. —— wyldi, Tristr. (p. 387), Costa Rica, very young specimen, #}. 
6. fieldi, Tryon (p. 894), Lake of Nicaragua, }. 
7. tenuis, Dunk. (p. 884), Mexico, young specimen: 7a, a still younger one. 
8. caribeus, @Orb. (ancylostomus, Cr. & Fisch.) (p. 387), Vera Cruz, obtained by Uhde, 
a somewhat irregular specimen (see p. 388). 
of. __—., Vera Cruz, young specimen: 94, a still younger one. 
10. nicaraguanus, Morel. (p. 391), Lake of Nicaragua, type-specimen of Morelet, from a 
drawing made by E. Smith. 
84* 
