183 
NAUTILUS striatus. 
TAB. CLXXXII. 
-Spec. Ciiar. Slightly depressed ; umbilicate ; con- 
centrically striated ; aperture half the diameter 
of the shelly nearly orbicular. 
"W horls rather gibbose, they are few, and increase 
rapidly ; the umbilicus is large, exposing a small part of 
the inner whorls ; the numerous stride which cover the 
surface are irregular, elevated, and so strong, that they 
might almost be considered as ridges ; the front is a little 
compressed, giving the aperture a squarish form. 
Found in the blue Lyas at Lyme Regis, Dorset. 
The large fragment was lent me by the Rev. W. Ruck- 
land. 
