444 MOLLUSCA. 
Melania glaphyra, Hanley, Conch. Miscell., Melania, t. 2. fig. 17°. 
Pachychilus glaphyrus, var. y. immanis, Fisch. & Crosse, loc. cit. p. 351, t. 58. figg. 1, la’. 
? Melania maxima, Lea, P. Z. S. 1850, p. 187 *. 
One, two, or three strong, knobbed, spiral keels on the last-formed whorls (the terminal and the second and 
third from the end); vertical plaits stronger on the first-formed whorls, nearly vanishing on the later 
ones. Attains a very large size: long. 80-108, diam. 34-40; apert. long. 293-32 millim. 
Hab. N. Guaremata: in small streams in the Province of Peten (Morelet*); Dolores 
(Morelet’); Coban *&; Rio Jacinto at Punta Gorda (v. Lhering, in litt.). 
The variety of P. glaphyrus figured by Pilsbry (Proc. Acad. Phil. 1892, p. 339, t. 10. 
fig. 6), from Tabasco, is very near this form, but of smaller size and wants the spiral 
ridges at the base, as in var. 7 from the same locality. 
b. Var. polygonatus. 
Melania polygonata, Lea, P. Z. 8S. 1850, p. 195°; Reeve, Conch. Icon. xii., Melania, t. 3. fig. 11". 
Pachychilus glaphyrus, var. 8. polygonata, Fisch. & Crosse, loc. cit. p. 351”. 
Pachychilus (polygonatus, var.?) rovirosai, Pilsbry, Proc. Acad. Phil. 1892, p. 153, t. 8. fig. 10”. 
Vertical plaits strong, extending to the last-formed whorl, rather distant, 8-9 on each whorl; spiral ridges 
rather fine, strong only on the base of the last whorl. Long. 67-70, diam. 29-31; apert. long. 
21-26 millim. 
Hab. S.E. Mexico: western brow of the little ridge of the Limon, State of Tabasco 
(Rovirosa 1). 
N. Guatemata: Coban * 9 (Conradt, in Mus. Berol.); Dolores (Morelet '*). 
c. Var. scamnatus. 
Pachychilus glaphyrus, var. 5. scamnata, Fisch. & Crosse, loc. cit. p. 352, t. 52. fig. 2”. 
Near the preceding, but with the vertical plaits crossed by 3-4 elevated spiral ridges. Long. 68, diam. 31 ; 
apert. long. 25 millim. 
Hab. N. GuatemaLa: Coban (Bocourt 18), 
d. glaphyrus, 8. strict. 
Melania glaphyra, Morelet, Test. Noviss. i. p. 24 (1849) *; Reeve, Conch. Icon. xii., Melania, t. 2. 
fig. 8°”. 
Pachychilus glaphyrus, var. «. glaphyra, Fisch. & Crosse, loc. cit. p. 352, t. 52. fig. 2a"*. 
Pachychilus glaphyrus, var., Pilsbry, Proc. Acad. Philad. 1892, p. 339, t. 14. fig. 5”. 
More cylindrical; vertical plaits strong, persistent, crossed by 6-7 elevated ridges; last whorl angulated in 
the continuation of the suture. Long. 63-71, diam. 20-27; long. apert. 22-24 millim. 
Hab. 8.E. Muxico: State of Tabasco (Rovirosa 1"), 
N. GuatTemaLa: at the springs of the River Usumacinta (Morelet 1°); Province of 
Peten, in small streams (Bocourt 1°). 
e. Var. glaphyroides. 
Melania immams, var. ¢, Brot, loc. cit. p. 22, t. 2. fig. 1f**. 
Pachychilus glaphyrus, var. ¢. glaphyroides, Fisch. & Crosse, loc. cit. p. 352". 
* The locality given by Lea ®® is «‘ Copan, Central America” : probably Coban is intended. 
