122 AURIS-GONYOSTOMUS. 



Key to species of Gonyostomus. 



I. Shell fusiform, base angular ; aperture with a basal channel. 

 a. Unicolored chestnut ; granulation fine, goniostoma. 



aa. Striped and maculated with yellow, more coarsely gran- 

 ulated, hybrida. 

 II. Shell ovate-conic, base rounded ; aperture rounded below, 

 a. Opaque whitish and dark brown, streaked, dotted and 

 maculated, multicolor. 



A. GONIOSTOMA Ferussac. PI. 43, fig. 76. 



Shell rimate-umbilicate./imjorm, solid, chestnut-brown. Surface 

 finely, irregularly striate longitudinally, and encircled by close, un- 

 equal, spiral series of minute granules. Spire long, the apex obtuse. 

 Whorls 6, gently convex, separated by oblique sutures, the last 

 whorl compressed and angular at base, the umbilical region excavated. 



Aperture less than half the alt., elliptical, angular above and be- 

 low, whitish or livid within. Peristome very narrowly reflexed 

 throughout, rose color or white; basal margin produced, angular 

 and channelled; columella margin concave, with alow entering fold 

 above ; parietal wall bearing a white callus between the lip ends, 

 livid within. 



Alt. 56, diam. 18*-21 mill, (specimens). 



Alt. 60, diam. 19 mill. (Pfr.). 



Macahe (Paz), and Rio Janeiro, Brazil. 



Helix (Cochlogena} goniostoma FER., Prodr., p. 57, No. 441 



(founded on MAWE, Travels in the Interior of Brazil, 



1812, third plate of Appendix, fig. 3; and with a"?," Lister, pi. 

 1059, f. 4 [=Glandina truncata~\~). WOOD, Index Test. Suppl., pi. 

 7, f. 246. Bulinus goniostoma SOWB., Zool. Journ., i, 1825, p. 59, 

 pi. 5, f. 2. DESH. Lara., An. s. Vert, viii, p. 249, and in Fer., 

 Hist., p. 105, pi. 143, f. 9, 10. POT. & MICH., Galerie, i, p. 141, pi. 

 14, f. 17, 18. PFEIFFER, Conchyl. Cab., p. 21, pi. 5, f. 1, 2 ; Mon- 

 ogr., ii, p. 50 (excl. var.). REEVE, Conch. Icon., pi. 34, f. 206. 

 Pupa goniostoma GRAY. Gonyostomus gonyostoma BECK, Index, p. 

 53. Goniostoma erubescens SWAINS, Malacol., p. 177, 335, f. 25. 



This well-known species is unmistakable, its only near ally being 

 the next species, with which it was formerly united. The smallest 

 fully adult specimen I have seen is 49 mill. long. The only varia- 



