186 MEGASPIBA. 



mouth. The sculpture and the internal structure seem to be 

 substantially the same. Specimens measure 36 to 36.5 mm. 

 long, 7 wide above the aperture, with 18% to 19% whorls. 



3. M. ELATA (Gould). PL 28, figs. 5, 6; pi. 29, figs. 12, 13. 



Shell minutely rimate, cylindric-tapering, terminating 

 above in a very obtuse, rounded apex; thin but moderately 

 strong. Faintly yellowish corneous, sparsely streaked with 

 reddish; sculptured with fine, close, oblique rib-stria, the 

 intervals somewhat wrinkled across. Whorls 19 to 21, slightly 

 convex. Aperture somewhat oblique, irregularly ovate ; outer 

 and basal margins narrowly expanded, columellar margin 

 dilated above. Columella with two folds, the lower one bifid ; 

 parietal lamella small, penetrating about 6 whorls. Interior 

 as in M. elatior, but the scalloped columellar lamella is some- 

 what longer, and the basal barriers are low, and without 

 hooks, only a few of the upper ones showing a notch at the 

 axial end. 



Length 39, diam. above aperture 7.8 mm., whorls 20%. 



Brazil. 



Pupa (Megaspira) elata GLD., Proc. Boston Soc. Nat. Hist., 

 ii, p. 197 (March, 1847) ; Otia Conch., p. 34. Megaspira 

 elata GLD., U. S. Expl. Exped., Moll, and Shells, p. 91, pi. 7, 

 f. 101. KUSTER, Conch. Cab., p. 140, pi. 17, f. 6Balea 

 elatior var. g, PFR., Monogr., ii, p. 390. 



Readily distinguished from M. elatior and its var. gracilis 

 by the decidedly finer external sculpture and the lower radial 

 barriers of the interior. The name might be held to conflict 

 with the earlier Pyrgelix elata of Beck, but that has never 

 been used in combination with the generic term Megaspira, 

 and since Beck does not claim it as a new name, it was evi- 

 dently an error for elatior. 



Gould's description follows: " Shell subcylindrical, elon- 

 gated, thin, shining, longitudinally barred with crowded 

 strise, horn-colored, and variegated near the suture with 

 small, dusky blotches. Spire obtuse at apex, composed of 

 about 19 narrow, nearly plain whorls. Aperture small, 

 oblique, lunate, somewhat effuse at base, with a lamellar plate 



