THE NAUTILUS. 



77 



white, lirate callus a short distance within the outer lip. The 

 very short columella bears a thin, wide, entering and descend- 

 ing lamella. Above it, on the lower part of the parietal wall, 

 there is a low, subtriangular callus. It is much more promi- 

 nent in young than in adult shells. 



Length 8.6, diam. 5, length of aperture 6.7 mm.; 11 to 12 

 whorls. 



Panama City and Paitilla, near by. 



This species is very peculiar by its many narrow whorls, very 

 narrow aperture, and the large, inwardly descending columellar 

 lamella. It seems remarkable that it was not found by Pro- 

 fessor Adams, but nothing described in his catalogue agrees 

 with it, Perhaps it is his unidentified No. 316. 





Fig. a represents the type; fig. b is the basal part of the same 

 specimen rolled more towards the left. Fig. c is the lower part 

 of a young specimen, to show the larger lamellae of that stage. 



PHYTIA BREVISPIRA. Fig. d. 



The shell is oblong-conic, not very solid, cinnamon-brown, 

 glossy marked with weak growth-lines only. The spire is 

 straightly conic, shorter than the aperture; whorls very slightly 

 convex, the last somewhat concave below the suture, with one 

 or two spiral lines in the concavity defining a wide sutural 

 margin. The aperture is pinched in above, becoming moder- 

 ately wide and rounded below, the outer lip thin, without in- 



