“PHYSA.:*: 367 
(1837)], =P. spiculata, according to the typical specimen of Anton, now in the Dresden 
Museum. It has been renamed P. antonii by Kiister [Martini & Chemnitz, Syst. 
_ Conch.-Cab. ed. 2, Limnzeaceen, p. 12 (1850)], but his figures (t. 2. figg. 6-8) much 
-more nearly resemble P. sowerbyana, dOrb. ; it is therefore probable that Megerle and 
Anton have united different forms under the one name peruviensis, which, moreover, 
is preceded by P. peruviana, Gray (Spicilegia Zoologica, 1828). 
Var. tapanensis. 
Aplecta tapanensis, Fisch. & Crosse, loc. cit. p. 98, t. 30. figg. 6 a, b°. 
Physa speculosa, Clessin, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Limnziden, p. 349, t. 49. 
fig. 9”. 
Spire shorter, shell very thin, aperture more lengthened below, columellar margin more twisted. 
Long. 16, diam. 7; apert. long. 9, lat. 3 millim. 
e885 os 83 a 103, ,, 44 ,, 
Hab. S.W. Mexico: Tapana, on the Isthmus of Tehuantepec, west of Tonala 
(Sumichrast °). 
S.E. Mexico: Frontera, State of Tabasco (H. H. Smith: young specimens). 
Yucatan: Campeche (Morelet); Tabi (Godman). 
Some of the specimens collected by Morelet agree exactly with this variety. 
Clessin’s description and figure’ were drawn from an example in the Albers col- 
lection, which is now before me; the name “ speculosa” being evidently a mistake 
for “ spiculata.” 
Var. guatemalensis. 
Aplecta tapanensis, var. guatemalensis, Fisch. & Crosse, loc. cit. p. 94°. 
Similar to the preceding, but considerably smaller. 
Long. 13, diam. 7 ; apert. long. 9, lat. 3 millim. 
Hab. CentraL GuatemaLa: Plateau of Guatemala, in small streams (Bocourt 8). 
W. Guaremata: Antigua, in wells in the city (Stoll); Lake of Duefias (Salvin). 
CrentraL Costa Rica: San Francisco de los Rios, near San José (Pittier); San José 
(Biolley). 
I am unable to point out any reliable characters by which the vars. tapanensis and 
guatemalensis may be separated from P. sowerbyana, d’Orb. (rivalis, Maton), a species 
common in the Antillean islands and on the continent of South America. 
Var. nitidula. 
Physa nitidula, Clessin, loc. cit. p. 339, t. 47. fig. 9 (1886) °*. 
Hab. Honvvras (coll. Morelet *). 
Clessin 9 describes the columellar margin as twisted, but according to his figure it is 
not essentially different from that of the typical form of P. spiculata. 
