408 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



All the species of Orthalicus enumerated above whose dentition is known 

 have the same type of teeth as O. undatus, excepting O. gallina-sultana. This 

 last (see Ann. Lye. N. H. of N. Y., XI. 38, PI. IV. Fig. A) is peculiar in hav- 

 ing a long, stout cutting point with subobsolete side points to its central tooth, 

 and three lateral teeth of same form but asymmetrical. Thus in both Liguus 

 and Orthalicus we find the usual type of dentition is not constant excepting as 

 to the marginal teeth. 



I have also examined the form figured in Vol. IV. PI. LXXVIII. Fig. 

 12, and copied in L. and Fr.-W. Shells N. A., I. p. 216, Fig. 370 (not Fig. 

 371, which is referred by Fischer and Crosse to O. melanochilus, Val.). It 

 is probably a variety of undatus, not O. zebra, as I at first believed. The jaw 

 has 7 — 1 — 7 separate pieces. The lingual membrane has 126 — 1 — 126 teeth. 

 The teeth are of same type as in O. undatus, but the cutting edge of the cen- 

 trals and first laterals is shorter than the base of attachment. 



Orthalicus undatus, P/rug. 



Vol. III. PI. LIV. 



Shell imperforate, subconical, rather thick, smooth ; incremental striae fine, 

 whitish, with longitudinal, irregular, undulating or somewhat zigzag, dark 

 brown bands and clouds, intersected by straight, revolving lines of the same 

 color; the body-whorl often with one or more straight, brown lines, at irregu- 

 lar intervals, indicating the former margins of the aperture ; spire conic, apex 

 obtuse; whorls 6 to 7, diminishing in diameter rapidly ; body-whorl capacious, 

 occupying two thirds of the whole length of the shell ; aperture ample, ovate, 

 showing the external colors within ; peristome simple, acute, bordered with 

 dark brown, or black, both internally and externally ; parietal wall with a thin, 

 shining, brownish, entering callus ; columella slightly thickened, not reflected, 

 nor truncate, making a continuous curve with the peristome. Common length 

 of axis about 50 mill.; diameter of large whorl rather more than 25 mill. 



{Bulla) Zebra Mullen, Chemnitz, IX. Pt. 2, p. 24, PI. CXVII1. Figs. 1815, 1816. 

 Helix (Cochlostyla) undata, Ferussac, Tab. Syst., p. 32, No. 337 ; Hist., PL 



CXV. Figs. 1, 4 ; PI. CXIV. Figs. 5, 6. 

 Bulimus (0.) undatus, D'Orbigny, Cuba, I. 174, PI. VI. Figs. 9, 10. 

 Bulimus zebra, Binney, Terr. Moll., II. 271, PI. LIV. (= Ferussaci, Mart, teste, 



Fischer and Crosse). — W. G. Binney, Terr. Moll., IV. PI. LXXVII. Fig. 



13? — Pfeiffer, Mon. Hel. Viv., II. 143. 

 Orthalicus undatus, Shuttleworth, Not., 63, PI. III. Figs. 4, 5. — Pfeiffer, 



Mon. Hel. Viv., IV. 589. — Tryon, Amer. Journ. Conch., III. 166? — W. 



G. Binney, L. & Fr.-W. Sh., I. 217 (1869). 

 Bulimus zebra, W. G. Binney, Terr. Moll., IV. PL LXXVIII. Fig. 12. -Var. 



Reeve, Con. Icon., PL XXVII. Fig. 90 b ? 

 Orthalims zebra, Fischer and Crosse, Moll. Mex. et Guat., 441, PL XVIII. 



Figs. 8, 8 a. 



