PHYSA. 357 
Physa aurantia, Sowerby, in Reeve’s Conch. Icon. xix., Physa, t. 2. fig. 13*; Clessin, in Martini 
& Chemnitz, Syst. Conch.-Cab. ed. 2, Limneiden, p. 269, t. 87. fig. 1°. 
Aplecta aurantia, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, ii. p. 86, t. 30. fig. 2, t. 33. fig. 1°. 
More inflated than the preceding (P. maugere), with shorter blunt spire; colour almost always orange-brown 
with a tendency to darker shades, in rays, below the suture (Carpenter *) ° 
a. Long. 35, diam. 18; apert. long. 27, lat. 15 millim. | 
6b 865, 84 ,, 163. 
ce 864, 33, ,, 17d; + 26, , 18 ,, 
d. ,, 323, ,, 16; > 244, ,, 11 
@ 5, 29, 4, 16; 5 22, , 9 ,, 
a. From the figures given by Binney*; 6. From Menke!; ¢. From Fischer and Crosse’s figure, t. 33, fig. 1°; 
d. Measurements given by Fischer and Crosse in the text °; e. From Sowerby’s figure. 
Hab. N.W. Mexico: Mazatlan (H. Melchers1; Fr. Reigen? >> 6), 
Var. glandiformis. 
Aplecta aurantia, var. glandiformis, Fisch. & Crosse, loc. cit. p. 86, t. 32. fig. 17. 
Spire short and blunt, as in the type; general outline more ovate. 
Hab. 8.W. Mexico: Acapulco (Sallé7). 
3. Physa nitens. (Tab. XIX. fig. 19.) 
Aplexa suturalis, Beck, Index Moll. p. 117 (1837) (sine descr.) ’. 
Physa nitens, Philippi, in Kiister, Martini, & Chemnitz, Syst. Conch.-Cab. ed. 2, Limnzaceen, p. 5, 
t. 1. figg. 1, 2 (1845) °*; v. Mart. Malak. Blatt. xii. p. 57 (1865) *; Strebel, Beitr. Mex. 
Land- und Siissw.-Conch. i. p. 49, t. 6. figg. 25 (living animal), 25 a—/*. 
Bulinus nitens, Binney, Land and Freshw. Shells N. Am. ii. p. 98, fig. 168 (copied from Kiister) °. 
Aplecta nitens, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 88, t. 39. figg. 1, la, 16 
(the living animal, copied from Strebel) °. 
Aplexa nitens, Pilsbry, Proc. Acad. Phil. 1891, p. 3257. 
Physa conspicua, Uhde, MS. in Mus. Berol.*. 
More oviform than P. maugere and P. aurantia, last whorl about equally convex above and beneath; spire 
moderate, pointed. Colour dark brown, with a whitish band near the suture (Philippi ”), clear or deep 
chestnut-brown (fading after death), with a reddish and often also a whitish band near the suture 
(Strebel *). In some specimens (as in the one found by Uhde) a few white rays are visible on the last 
two whorls. 
. Long. 26, diam. 14; apert. long. 183, lat. 83 millim. 
29 313, be) 15; 29 23%; 9 9 9? 
30, ” 132; 29 24, ” 9 2” 
29, ” 16; ” 22, ” 9 ” 
253, » 12; ” 193, 55 63 ” 
” 20, ” 103 ; ” 143, 9 53 ” 
a. From the figure of Philippi’s type”; 6. From a specimen collected by Uhde, in Mus. Berol.* (Strebel, 
fig. 25¢); ¢ and f. Measurements of individual variations given by Strebel*; d. Fischer and Crosse’s 
specimen of A. nitens®; e. Specimen in the collection of the late Albers. 
Hab. FE. Mexico: Vera Cruz, in ditches, and the larger ones in puddles* (Uhde?®; 
mS Asemes 
* Pp, 1-28 and tabb. 1-4 of this Monograph were edited by Kiister, under the title “ Limnzaceen”; the 
remainder was dealt with by Clessin under the title ‘‘ Limneiden.” Pp. 21-28 were published in 1850 
(cf. Troschel, Archiv f. Naturg. xvii. 2, pp. 101, 128); pp. 1-20 very probably before 1846 (¢f. Troschel, ibid. 
xii. 2, p. 414). 
