APPENDIX. 



The following errata should be corrected in the text with pen or 

 pencil ; errors and confusion will thereby be avoided : 



Page 38, under DIALEUCA, substitute H. fuscocmcta for " H. fus- 

 colubris" as the type of Leptoloma. 



Page 44,- second line of description of H. DENNISONI, read deep 

 maroon color instead of " deep narrow color." 



Page 55, after Var. SUBBROCHERI, read PI. 32, fig. 59, not fig. 60. 



Page 67, after H. TRINITARIA, read PL 17, figs. 38-40, 42, 43. 



Page 74, fourth line of remarks under H. dominicensis, read 

 penultimate instead of " antepenultimate." 



Page 83, after H. OBESA, add PI. 29, figs. 37, 38. 



Page 120, after H. CAROCOLLA, add PI. 24, fig. 39. 



Page 164, after H. PLICATA, var., read PL <&,figs. 6, 7, 8. 



Page 159, to synonymy of LABYRINTHUS, add I^rootoma SwAtff- 

 sox, 1840. 



HEMITROCHUS. 



H. GAUSSOINI Tryon. PI. 63, figs. 14, 15. 



After the part of this volume containing the description of this 

 species (page 47) was in type, I was fortunate enough to find the 

 specimens. 



The shell is globose-depressed, with the tiniest umbilical rimation, 

 thin but rather strong. The color is white, because the two shells 

 before me have lost the cuticle, having been long dead and weathered. 

 The surface has oblique, rather fine and irregular "growth-striae. 

 The spire is low-conoidal ; whorls 5, slightly convex, slowly regu- 

 larly widening, the last depressed-globose, rounded on periphery and 

 ba^e, scarcely descending anteriorly. The aperture is oblique, 

 rounded lunar; peristome sharp, not expanded nor reflexed, 

 regularly curved in every part, the baso-columellar margin decidedly 

 thickened with callous inside, widest at the insertion, and a mere 

 trifle dilated over the scarcely perforate axis. 



Alt. 6i>, diam. maj. 10, min. 9 mill. 



[A closely allied form has recently been sent to the author from 

 Caymen Island, south of central Cuba. It is more depressed than 



(197) 



