664 
Big. 
Fig. 
EXPLANATION OF PLATES. 
11. Bulimulus durangoanus, n. (p. 246), Villa Lerdo. 
12-16. schiedeanus, Pfr. (p. 239), Tehuacan, different forms. 
17. —— » Villa Lerdo. 
18. —— , specimen from an unknown locality. 
19, 20, 21, 22. , somewhat deformed and abbreviated examples, found at Tehuacan 
among more normal ones. 
23. —— , young specimen, Tehuacan. 
[ 24. alternatus, Say (p. 243), dark-streaked specimen, Texas: 24a, back view ; 
24.6, aperture seen from the side, showing the columellar tubercle. ] 
[25, —— (p. 243), white specimen (B. marie, Albers), Texas. ] 
[ 26. , unusually broad example, approaching in general form to B. schiedeanus, 
Texas. | 
PLATE XVI. 
1. Otostomus attenuatus, Pfr., var. pittier’, n. (p. 216), Alto de Mano Tigre. 
2. Celocentrum clava, Pfr., var. rufescens, n. (p. 271), Mexico. ~ 
3,4. Eucalodium truncatum, Pfr. (p. 264), normal forms, Angangueo! 4a, summit of the 
shell, seen from above; 4.0, enlarged view of the sculpture; 4c, base of the shell, seen 
from below. 
5, 6, 7. , smaller full-grown forms, + also from Angangueo. ) ° Ow Ad AS 
8, 9. , young specimens, SL Lye 
10-16. Holospira elizabethe, Pilsbry (claviformis, n.) (pp. 277, 635), Anta, the most different 
forms chosen from a very large number of specimens found at the same locality: 16, a 
young specimen. The figures below show the shell seen from the basal end. 
17. teres, Menke, var. hoegeana, n. (p. 280), Maltrata. 
18. pfeifferi, Menke, var. minima, un. (p. 280), Mexico. 
19-24. fusca, n. (p. 281), Omilteme, the most different forms chosen from a large 
number of examples found at the same locality : 24, a not full-grown specimen. The 
figures below show the shell seen from the basal end. 
25. —— imbricata, v. Mart. (p. 273), Mexico, type-specimen, copied from Malak. Blatt. xii. 
t. 1. fig. 2 (1865). 
26. Celocentrum championi, n. (p. 269), Cerro Zunil: 26a, shell seen from the basal end 
26 6, view of the columella within the whorls ; 26 c, enlarged view of the sculpture. 
27. —— gigas, n. (p. 267), Livingston, young specimen. 
28. , Livingston, full-grown specimen : 28 a, upper end of the full-grown truncated 
shell from above; 28 0, basal end; 28 c, enlarged view of the sculpture. 
29, clathratum, nu. (p. 269), Hacienda Buenavista: 29 a, upper end of the truncated shell ; 
29 b, basal end, seen from below ; 29 c, enlarged view of the sculpture. 
30. —— » same locality, living animal, from a drawing made by Dr. O. Stoll. 
31-84. Eucalodium strebeli, Pfeffer (p. 265), Cerro de Palmas, the most different forms chosen 
from a large number of specimens found at the same locality : 33 a, enlarged view of 
the sculpture. 
