358 MOLLUSCA. 
Strebel 4); San Juan, near Vera Cruz (Heilprin’) ; Jalapa (Hoge); Mexico, without 
nearer indication of locality ? >. 
Yucatan (Philippi, in coll. Dunker). 
Fischer and Crosse’s figure of Aplecta nitens represents the most ventricose specimen 
I have ever seen. 
Strebel4 mentions subfossil specimens of 33 millim. in length, and Fischer and 
Crosse® figure (t. 39. fig. 3) a subfossil example from Vera Cruz, which measures 
36 millim., but approaches in its outlines P. maugere. 
Var. gracilenta. 
Physa nitens, schlankere form, Strebel, loc. cit. p. 49, t. 6. figg. 25 5, c’. 
Aplecta aurantia, var. 8. gracilenta, Fisch. & Crosse, loc. cit. p. 37, t. 39. figg. 4, 4a”. 
Diameter less than one-half of the whole length of the shell. Colour paler yellow, often with white rays. 
a. Long. 28, diam. 13; apert. long. 20, lat. 7 millim. 
b. 2 253 ” 12; ” 193, ” 63 ” 
C. 2 183 ” 833 ” 13, ” 5 ” 
d. ” 163 ” 743 2” 11g, ” 4 ” 
a. Measurements by Fischer and Crosse; 6 and d. by Strebel*, as individual variations of P. nitens ; 
c. Taken from a specimen collected at Tejeria by Hoge. 
Hab. E. Mexico: Vera Cruz, found with typical specimens (Strebel ®); Tejeria, several 
specimens, one 27 millim. long, all the others about the same size, and varying a 
little in the comparative diameter, some with a few white rays ({ége). 
N. Guatemata: Coban (Bocourt !), 
CENTRAL GuaTEMALA: San Antonio, north of the city of Guatemala (Sto//). 
4, Physa impluviata. (Tab. XX. fig. 1.) 
Physa impluviata, Morelet, Test. Noviss. 1. p. 18 (1849) *. 
Aplecta impluviata, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, il. p. 91, t. 30. fig. 3, t. 89. 
fig. 5°. 
Physa purpurostoma, Tristram, P. Z. 8. 1861, p. 231°. 
Aplecta purpurostoma, Fisch. & Crosse, loc. cit. p. 90%. 
Physa nitens (Philippi), v. Mart. P. Z.S. 1875, p. 649°. 
The most ventricose of the medium-sized species of the subgenus Aplecta, with somewhat broad, but very flat 
and faint strie; columellar margin straight, rather thick, well distinct from the very convex bulk of the 
last whorl, somewhat dark purple above, white in the middle and below. 
Long. 22-23, diam. 12-13 ; apert. long. 15, lat. 63 millim. 
Hab. 8.K. Mexico: Tabasco (Saldé ?). 
N. GuatemaLa: Coban, in a pond (S¢ol/), 
Centra GUATEMALA: Guatemala city, in small streams (Morelet 12). 
W. Guatemata: from asmall stream running into the lake of Duefias, above Santiago 
Zamora (Salvin, Aug. 1873°); Lake of Duefias (Salvin 3+); Duefias, in pools 
near the lake (Stol/) ; Capetillo, a little below Antigua in the valley between 
the Volcan de Agua and Volcan de Fuego (Champion). 
CrntraL Costa Rica: San Francisco de los Rios, near San José (Pittier). 
