4 Unhcrsity of Michigan 



lata ("Menke" Pfr. ) (1846) are present in this lot. although 

 specimens in the A. X. S. P., from both Curacao and Buen 

 Ayre (Bland), approach the description of the latter. It will 

 prol^ably be fotmd to be a local species or subspecies. 



The shape of the aperture is very varial)le. A tendency to 

 form a broad, angular columellar reflection, and an almost can- 

 aliculate, free upper angle is quite common. 



The apical whorls of young specimens are irregularly and 

 lightly pitted. The remainder of the whorls have fine, close- 

 set axial riblets. which are always quite regular. These are 

 usually crossed l)v heavy spiral angulations; as manv as 17 

 may l)e present, or they may be so faint as to be practically 

 absent. It is quite impossible to use this character to deter- 

 mine the sectional position of this lot. One shell has only one 

 si)iral thickening, which runs around the greatest ventricosity 

 and makes all of the whorls quite markedly angular. In addi- 

 tion, a few shells are malleate. 



Representative examples measure : 



Greatest Height Diameter 



Altitude diameter aperture aperture 



male: 12.8mm. 70 ( 9.0mm.) 52 ( 6.7mm.) 45 (5.8mm.) 



female: 19.8mm. 64 (12.7mm.) 30 (lo.oinm.) 45 (8.9mm.) 



Chondropoina (?) ravcni (Crosse) (1872). 



Ten dead s])ecimens from rock debris. In some specimens 

 the aperture is scarcely solute, while in t)thers the entire last 

 whorl is free. None of my specimens have the operculum 

 (comjjare Henderson and Bartsch, 1920), but the shell char- 

 acters are certainly closest to the group of Annnlaria lachncri. 

 The apical whorls (figs. 1-6) are practically smooth, I)ut show 

 irre;(ular anastamosing wrinkles under high magnification; 

 they arc always eroded from adult specimens, but the total 

 number of wb.orls must lie about 9. 



