166 HELIX-LABYEINTHUS. 



colored, continuous, upper and outer margins expanded, the latter 

 bearing at its junction with the base a compressed elevated short 

 entering lamina, rather deep-seated, not extending to the edge of 

 lip by about 2 millimeters ; basal lip slightly incurved in the middle? 

 reflexed, bearing a small dentiform fold near its outer part ; parietal 

 wall with a slightly sinuous long plate-like entering fold ; umbilicus 

 narrow, about 4 mill, wide ; superior lip curved downward. 



Alt. 12, diam. maj. 25, min. 21 mill. ; apert. wide 14, long 8 mill. 



Costa lit ca- 

 ll, triplicata MARTENS, Malak. Blatter 1868, p. 156. PFEIFFER, 

 Novitates Conch., iii, p. 460, t. 101, f. 1-3. H. cesopus ANGAS, 

 Proc. Zool. Soc. Lond. 1878, p. 72, t, 5, f. 11, 12; loc. ciL, 1879, p- 

 476. 



This shell may be known by the almost rounded periphery? 

 deflexed superior lip of the aperture, outer basal tooth a short high 

 lamella, removed from the edge of peristome. It has a longer 

 parietal lamina than H. quadridentata, tamsiana or leucodon, and is 

 less carinated ; the parietal callous is not incurved in the middle as 

 in H. manueli, and the lower lip is different. 



Var. CESOPUS Angas. PI. 64, figs. 27, 28. 



Larger, more conical, heavier, with nearly one more whorl, deep 

 purplish-brown above, yellowish beneath with a faintly indicated 

 dark zone ; and a dark umbilical patch ; whorl less deflexed an- 

 teriorly ; upper lip less flattened ; scrobiculatious or grooves behind 

 the basal lip shorter ; peristome white, reflexed all around, thick- 

 ened ; lip-teeth brown, parietal lamina white. 



Alt. 15, diam. maj. 27, min. 22* mill. ; aperture, width 15, length 

 11* mill. 



Buena Vista, Costa Rica (3000 ft. alt.) 



My figures of this form are from specimens collected by GABB. 

 Since writing the above description, I have seen a form intermediate 

 between triplicata and cesopus, having the deep color of the first, and 

 the form of aperture of the latter variety. 



H. MANUELI Higgins. PL 42, figs. 27, 28 ; pi. 55, figs. 15, 16. 



Umbilicate, depressed, thin but rather strong, acutely carinated 

 at the periphery, light chestnut-colored ; surface lightly obliquely 

 striate and indistinctly, minutely granulated; spire low-conoidal, 

 apex obtuse, apical whorl smooth and whitish, sutures slightly im- 



