weW YORK SHELL CLUB NOTES No. 234 _ September 1977 Page 

NEW YORK CITY MOLLUSCAN FOSSILS 
Morris K. Jacobson 
Colus stonei Pilsbry, 1892 was described by Dr. Pilsbry (as Chryso- 
domus (Sipho) ) on the basis of shells sent to him by vitner Stone 
(after whom the shell is named) from Point Pleasant, New Jersey. 
Other specimens were sent from Sea Isle City and Cape May, also 
New Jersey. 
Colus stonei is an ex- 
tinct species occurring 
as a fossil in Pleisto- 
cene deposits along the 
coasts of New York and 
New Jersey. Specimens 
are occasionally found 
washed up on the beaches 
as far south as Cape 
Hatteras and the species 
has been collected in 
fossil beds on Gardiner's 
Island at the far eastern 
end of Long Island, and 
on southern Nova Scotia. 
The shell differs from 
other species of Colus 
by having a shorter, 
dumpier shape, a deep 
suture and swollen body 
whorl, and a surface 
covered with prominent 
cords. Some authorities 
place it in the genus 
Atractodon Charlesworth. 
Although I have examined 
numerous examples of this 
species in private col- 
lections and in museums, 
the only specimens I ever 
found in Rockaway Beach 
are figured in the accom- 
panying illustrations. 

Collectors should keep 
their eyes open for this 
unhandsome but extremely 
interesting species. 
Illustration by Ed Carswell of Colus stonei from Rockaway 
Beach, New York. 
Upver specimen 40.6mm long x 20.5mm wide. 
iver snee tien (without spire) 56mm long x 39mm wide. 
—— an 
