42 THE NAUTILUS. 



2. Shells in which broken parts have been repaired or restored. 



2a. Broken peristome repaired, figs. 13, 14. 

 2b. A new peristome developed behind the original one after 

 breakage, figs. 7, 10, 15. 



3. Shells coiling abnormally. 



3a. Shell sinistral, fig. 17. 

 3b. Shell scalariform, figs. 4, 16. 

 3c. Shell irregularly coiled, figs. 1, 2, 8. 

 Part of these cases are always due to breakage ; others, such as 

 no. 1 and 3a to more obscure constitutional conditions. Scalariform 

 shells may be due to several causes. The subject is of some import- 

 ance from an evolutionary standpoint because the modifications 

 denoted by classes 1, 3a, 3b and 4c have in some cases become 

 actually characteristic of species or genera. 



Collectors having material enlarging our knowledge of the subject 

 as illustrated by Mr. Daniels are invited to make it known. 

 Figures 1 to 9 of plate V are about double the natural size. 



NEW CUBAN LAND SHELLS : I. ANNULABIA AND CHONDBOFOMA. 



BY H. A. PILSBRY AND JOHN B. HENDERSON, JR. 



The following species will be illustrated in connection with the 

 second paper of this series. 



Annularia ramsdeni n. sp. 



The shell is openly umbilicate, wider than high with conic spire. 

 Last whorl brownish-corneous or whitish, the spire light red, whorls 

 4^, strongly convex, the last tubular. Suture narrowly channeled, 

 the axial threads forming little points wher» they pass over the raised 

 edge of the channel. Sculpture of closely crowded lamina-like axial 

 threads, their intervals having one or two smaller threads. There 

 are a few low spiral cords within the umbilicus and a stronger one 

 near its opening. The first 1| whorls are smooth and well raised. 

 Aperture oblique, circular, pale red within the lip. Peristome 

 expanded, duplicated by a thin outer lamina on the columellar and 

 upper sides, dilated in a forwardly concave lobe above, which is 

 appressed to the preceding whorl. 



