PACHYCHILUS. 445 
Near the preceding ; vertical plaits less developed, 3-4 interrupted elevated spiral lines on the upper half of 
each whorl. Long, 53-54, diam. 20-21 3 apert. long. 18 millim. 
Hab. N. Guatema.a: springs of the River Usumacinta (Morelet 19), 
f. Var. semilevis. 
Melania immanis, var. 8, Brot. loc. cit. p- 21, t. 2. fig. 15. 
Pachychilus glaphyrus, var. . semilevis, Fisch. & Crosse, loc. cit. p. 352, t. 53. figg. 2, 2a”. 
Rather conical ; whorls evenly sloping in profile, angulated in the suture or its continuation ; vertical plaits 
weak, wanting in the upper whorls. Long. 70-75, diam. 30-33 ; apert. long. 30-31 millim. 
Hab. N. Guatemata; Dolores, Province of Peten (Morelet 71). 
Specimens from Rio Chajmayu, in Alta Vera Paz, noted by H. v. Ihering as 
P. opiparis, with rufous-brown periostracum and numerous subvaricose thickenings, 
probably belong to this variety. 
g. Var. opiparis. 
Melania opiparis, Morelet, Test. Noviss. ii. p. 28 (1851) ”. 
Melania pyramidalis (Morelet), Reeve, Conch, Icon. xii., Melania, t. 5. fig. 25”. 
Melania immanis, var. y, Brot, loc. cit. p. 21, t. 2. fig. le™. 
Pachychilus glaphyrus, var. 0. opiparis, Fisch. & Crosse, loc. cit. p. 358, t. 53. fig. 3”. 
Conico-turrite ; vertical plaits nearly or quite absent; spiral ridges also on the whorls above the sutural line, 
at least on the last two whorls. Long. 73-75, diam. 28-31; apert. long. 29-80. 
Hab. N. Guatemata: Dolores, Province of Peten, in small streams (Morelet 2? 25), 
The words opiparus and opiparis, in Latin, mean “‘ ample,” “ copious.” 
h. Var. pyramidalis. (Tab. XXV. figg. 2, 3.) 
Melania pyramidalis, Morelet, Test. Noviss. i. p. 25 (1849); Hanley, Congh. Miscell. t. 4. 
fig. 31. 
Melania opiparis (Morelet), Reeve, Conch. Icon. xii., Melania, t. 35. fig. 241 *. 
Melanoides godmani, Tristram, P. Z. 8. 1863, p. 113”. 
Melania godmani, Brot, loc. cit. p. 25”. 
Pachychilus godmani, Fisch. & Crosse, loc. cit. p. 363”. 
Melania immanis, var. 5, Brot, loc. cit. p. 21, t. 2. figg. 1 d,e”. 
Pachychilus glaphyrus, var. n, Fisch. & Crosse, loc. cit. p. 353, t. 52. figg. 1, la”. 
Pachychilus glaphyrus, var. @ (part.), Fisch. & Crosse, loc. cit. p. 358, t. 53. fig. 4. 
Pachychilus polygonatus, var. rovirosai, Pilsbry, Proc. Acad. Phil. 1892, p. 153, t. 8. fig. 9 (part.) 
36 
More slenderly turrite ; vertical plaits absent; spiral ridges confined to the base of the last whorl, or only a 
few above the sutural line on the last two whorls. 
. Long. 85, diam. 30; apert. long. 29 millim. (Brot, fig. 1 d). 
85, », 293 ” 26 ~,, (Brot, fig. 1 ¢). 
St, 28: - 24 ~~-,,- (Hanley, fig. 31). 
oF, 2S a 28 ~,, + (Morelet). 
SO. ,, 203 s 28 ,, (specimen collected by Stoll). 
75, 4 283 . 23 +4, (Fisch. & Crosse, fig. 1). 
(ee o 25 4,4, (Fisch. & Crosse, fig. 4). 
To. ,, 24; “ 23. ~-,,_+~=« (specimen in Dunker’s coll.). 
Q 
PAW aero 
