PACHYCHILUS. 455 
f. Long. 34, diam. 15; apert. long. 13 millim., Anfr. superst. 8 
g. ry 32, ” 14 > ” 13 ” ” 8 
h. 5, 25, 4 18; ” ll, ks 7. 
99 24, 5 11; ” 93 ” ” 8. 
k. 4, 22, 5, 103; 9 10. —,, es 8 
1. ” 15, ” 8 > ” $ ” 9 8. 
Me. 39 14, ” 8 ; ” 3 9 ” 8. 
a is a large but comparatively typical specimen ; 6, a very broad one; ¢ and d, comparatively slender, more 
turrite forms, approaching P. licbmanni; e is a curious, rather abnormal form, very turrite, with narrow 
last whorl, and therefore also more narrow aperture (probably an abnormally formed shell, with the 
last two whorls descending more than in typical specimens, so that the preceding whorl is embraced to a 
less extent by the following, and each of the abnormal whorls gains in height (length) what it loses in breadth, 
and also the whole shell in the same manner: I have seen similar monstrosities in several genera of shells). 
f-k are not full-grown shells, and among these some (f, h, &) are comparatively broader, others (g and 2) 
narrower. The two youngest, / and m (the last from Cordova), are the only ones in which the upper whorls 
are not chalky-white, but still brownish. 
9, Pachychilus apis. 
Melania apis, Lea, P. Z. S. 1850, p. 90"; Ann. & Mag. Nat. Hist. ix. p. 69 (1852)?; Reeve, 
Conch. Icon. xii., Melania, t. 38. fig. 266°; Brot, in Martini & Chemnitz, Syst. Conch.-Cab. 
ed. 2, Melaniaceen, p. 40, t. 5. fig. 3 (copy from Reeve) *. 
Melania (Elimia) apis, H. & A. Adams, Gen. Moll. i. p. 300°. 
Pachychilus apis, Fisch. & Crosse, Miss. Scient. Mex., Moll. ii. p. 856°. 
A distinct spiral keel on the whorls preceding the last, two on the last itself, according to the figure*; in 
Lea’s descriptions '*, however, four keels are mentioned. 
Tlab. FE. Mexico: Vera Cruz, in marshy places !~4, 
Brot+ suggests that P. apis may be an angulated variety of P. turatii. 1 cannot 
understand why Lea has named this species apis, “bee” (or Apis, the sacred ox of 
the old Egyptians ). 
10. Pachychilus indiorum. 
Melania levissima (Sow.), Brot, Matériaux fam. Mélaniens, i. p. 42°; in Martini & Chemnitz, 
Syst. Conch.-Cab. ed. 2, Melaniaceen, p. 34 (part.), t. 4. fig. 5d”. 
Pachycheilus levissimus, H. & A. Adams, Gen. Moll. i. p. 299, t. 81. fig. 7 (1854) *. 
Pachychilus levissimus, Fisch. & Crosse, Miss. Scient. Mex., Moll. ii. p. 828 *. 
Melania indiorum, Morelet, Test. Noviss. i. p. 25 (1849) ’; Petit Journ. de Conch. iv. p. 162, t. 5. 
fig. 7 (indorum) (1858) °; Hanley, Conch. Miscell., Melania, t. 3. fig. 24’. 
Pachycheilus indiorum, H. & A. Adams, Gen. Moll. i. p. 299°; Chenu, Manuel de Conch. i. p. 289, 
fig. 1983°. 
Melania sallei, Reeve, Conch. Icon. xii., Melania, t. 19. fig. 183 (1860) °°. 
Melania radix, Brot, loc. cit. p. 30, t. 3. fig. 5". 
Hab. E. Mexico: San Andres Tuxtla (Sallé *). : 
S.E. Mexico: Palenque, in small streams near the ruins (Morelet®); Isthmus of 
Tehuantepec, State of Oaxaca (Sumichrast *). 
H. v. Ihering (in Witt.) says that this species occurs also in N. and E. Guatemala, 
