26 



THE NAUTILUS. 



ing downward, we find in Fulyur coronatum var. rugosum Conrad, 

 from the Miocene of St. Mary's, Md., its probable ancestor. 



F. canaliculatum exhibits but little variation in the recent fauna, 



except in point of size, southern specimens becoming much smaller. 



Thus, at St. Augustine, Florida, the largest shells found are not 



over half the dimensions of the largest from the New Jersey coast. 



The typical form of this species is shown in fig. 2. Mr. James A. 



Harking, of Atlantic City, 

 has called our attention to 

 a remarkable deformed 

 specimen, which he found 

 at that locality, illustrated 

 in fig. 1. It is an adult of 

 average size, in which the 

 basal canal is twisted to 

 the left at a right angle to 

 the axis of the shell. The 

 growth-lines are every- 

 where unbroken, no evi- 

 dence of an early fracture 

 being visible, either outside 

 or within the a p e r t u r e. 

 There is an abnormal lump 

 or callus upon the upper 

 part of the columella, prob- 

 ably deposited to fill some 

 space left by the altered 

 position of the soft parts 

 in the cavity. 



It is difficult to say how 

 a monster of this sort was 

 produced. The unbroken 

 sweep of the growth-strire 

 FIG. !. F<il<ji< r i;ii,,ili<-i(lni<i,,'^M\-. from body-whorl upon the 



canal indicates that the present canal was formed entirely after the 

 abnormal condition set in, andjis not a case of shell fracture and 

 subsequent " patching" of llie'pieces, such as is often found. It is 

 probable that the columellar sidej|of the canal in the half-grown 

 individual was injured, both soft^and hard parts being affected ; the 

 mantle lining of the outer lipjand base of canal being unhurt. 



