THE NAUTILUS. OF 
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.; 1i 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. 6 is the basal part of the same 
specimen rolled more towards the left. Fig. ¢ 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- 
