450 _ MOLLUSCA. 
in the Berlin Museum has somewhat the appearance of a fossil shell, and the reddish 
or rusty colour noticed by Say and Lea seems to indicate that their examples also were 
not in a fresh state. 
My description and figure are taken from Deppe’s specimen, called Melania labiosa 
by Wiegmann, which, according to Brot, is identical with M. rubida, Lea, although 
this last-mentioned author says nothing of the spiral ridges, these being, however, 
distinctly visible in his figure. J. pluristriata, Say, seems to me, from the description, 
to belong to the same species. 
5. Pachychilus subnodosus. (Tab. XXV. figg. 11, 13.) 
Melania subnodosa, Philippi, Abbild. neuer Conch. ii. p. 173, t. 4. fig. 18 (Feb. 1847)"; Brot, in 
Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Melaniaceen, p. 29, t. 3. fig. 5 *. 
Pachychilus subnodosus, Fisch. & Crosse, Miss. Scient. Mex., Moll. ii. p. 366°. 
Near P. largillierti, the last two whorls more convex than the preceding, with some spiral ridges. Columellar 
margin very oblique, less descending than in the other species of the genus. Colour yellowish-brown. 
Hab. Centrat Nicaragua: Managua (Rothschuh, in Mus. Berol.). 
Costa Rica, without nearer indication of locality (van Patten, in Mus. Berol.). 
Very near P. lacustris, and also varying in a similar manner, but broader, each whorl 
broader compared to its height than in P. laeustris. The obliquity of the columellar 
margin is very striking in some specimens, as shown in Brot’s figure? and in our 
example from Managua, but this is less noticeable in Philippi’s original figure! and in 
our specimen from Costa Rica. 
The recorded localities for this species are rather vague: Philippi ! gives “ Central 
America,” and Brot?, on the authority of Sowerby, “ Guatemala,” which is doubted by 
Fischer and Crosse *. The Berlin Museum, many years ago, received a specimen of it 
with other Costa Rican shells from Mr. Van Patten, as having been found by himself 
in Costa Rica, but it has not been met with by either Pittier or Biolley. 
6. Pachychilus largillierti. (Tab. XXV. fig. 12; Tab. XXVI. fig. 2.) 
Melania largillierti, Philippi, Abbild. neuer Conch. 1. p. 62, t. 2. fig. 10 (1843) '; Reeve, Conch. 
Icon. xii., Melania, t. 18. fig. 127°; Brot, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, 
Melaniaceen, p. 31, t. 4. figg. la, 6, c*. 
Pachychilus largillierti, Fisch. & Crosse, Miss. Scient. Mex., Moll. ii. p. 364, t. 52. figs, 5,5a', 
Melania intermedia, Von dem Busch, in Philippi’s Abbild. neuer Conch. i. p. 160, t. 3. fig. 4 (1844)’; 
Reeve, Conch. Icon. xu., Melania, t. 20. fig. 141°. 
Melania rubicunda, Reeve, loc. cit. t. 31. fig. 206 (1860) ”. 
Melania rusticula, Von dem Busch, in Malak. Blatt. 1858, p. 86°. 
Melanoides glaphyra (Morelet), Tristram, P. Z. S. 1863, p. 413°. 
Melania guatemalensis, Parreyss, in litt.” 
Smooth on the greater part of the surface, but on the base of the last whorl se ; 
? veral elevated ore 7 : 
somewhat convex, especially the last.’ ated’ ridges. Whorls 
