CHIEFLY OF THE UNITED STATES. 127 



Remarks. — A. single specimen only of this well marked species was procured by Dr. 

 Newcomb. It is remarkable in the folds stopping suddenly on the middle of the 

 whorl, where a well marked transverse stria cuts them off. The folds are smooth 

 and arcuate. It is nearly allied to Myersiana, herein described. The aperture is more 

 than one-third the length of the shell. 



-'o'- 



Melania Planensis. PL 22, fig. 26. 



Testa lasvi, subfusiformi, magna, crassa, tenebroso-fusca, obsolete maculata; spira eleyata, conoidea; suturis 

 parum impressis ; anfractibus instar novem, convexiusculis, striis tranversis exilissimis impressis ; 

 apertura grandi, ovata, superne angulata, intus fuscata ; labro acuto ; columella albida, superne 

 inspissata. 



OperrAilo tenebroso-fusco. 



Shell smooth, subfusiform, large, thick, dark brown, obscurely spotted; spire raised, 

 conoidal ; sutures somewhat impressed ; whorls about nine, somewhat convex, with 

 transverse, impressed close stride; aperture large, ovate, angular above, brownish 

 within ; lips sharp ; columella whitish, thickened above. 



Operculum suboval, with three volutions and the polar point subcentral. 

 Proc. Acad. Nat. Sci. 1858, p. 118. 



Hah. — Plan and Omao, Valley of Ulua River, Atlantic Slope, Honduras, J. L. 

 LeConte, M. D. 



My cabinet and cabinets of Major LeConte and the Academy of Natural Sciences. 

 Diam. -90, . Length 2-27 inches. 



Remarks. — A number of very fine specimens were taken by Dr. LeConte during 

 his late scientific journey through Honduras. It is one of the largest and most robust 

 species which has come under my notice. It is nearly allied to M. Largillierti Phil., 

 but is not so slender, is darker, and has not the lines at the base. It is rather 

 larger than lierculea Gould, and has no appearance of ribs. The aperture is nine- 

 tenths of an inch long, being more than one-third the length of the shell. The young 

 specimens have the revolving strijB beautifully perfect, the dark markings are 

 somewhat flammulate, and a lighter line runs below the suture. The specimens from 

 Plan are covered with a deposit of carbonate of lime. I am indebted to the kindness 

 of Dr. LeConte for this fine species and other Mollusca from Honduras. 



Melania Veereauxiana. PL 22, fig. 27. 



Testa leevi, pyramidata, crassa, tenebroso-castanea ; spira valde elevata ; suturis linearibus ; anfractibus 

 11 — 12, planulatisj apertura subgrandi, ovata, intus parum brunuea ; columella alba incurvaque. 



Shell smooth, pyramidal, thick, dark chestnut colored ; spire much elevated ; su- 



