THE NAUTILUS. 29 
The only mollusk, seen to destroy the Melongena, was a Fascio- 
laria gigantea which enclosed it in its folds. 
On one occasion a dead king-crab was found, lying on its back, 
on which many Fasciolaria tulipa were crowded and eating it. 
An abundant food for the Fusciolaria distans is the Vermetus, 
(Petaloconchus) nigricans, into the tubes of which the former inserts 
its beak. 
A WORD ABOUT SPHZAERIA. 
BY EDWARD W. ROPER. 
Among thousands of Spheria examined during the past year 
several unique forms have been found. For example, a robust, 
rounded shell less than one-fourth inch long, with prominent beaks, 
from near Tallahassee, Florida. This is quite distinct from any 
species yet seen from the Gulf states. Again a very dark brown 
shell from southern Ohio, of the group of S. occidentale, but thicker 
and with more prominent beaks. From an unknown locality came 
a single specimen resembling a small S. transversum but with a less 
angular outline. Lastly from Minnesota and other neighboring 
states, may be mentioned a thin, orbicular, gray or light olive shell 
with calyculate beaks, often regarded as S. truncatum, but probably 
different from the New England shell described by Linsley. These 
forms have mostly come from single localities in very smal] numbers, 
and in view of the great variation among species in this genus, it 
would be unsafe to consider them new on such slight evidence. The 
writer would like correspondence with collectors having unique and 
doubtful Spheeria in their possession. 
THE MUSSELS SCARS OF UNIOS. 
BY CHAS. T. SIMPSON. 
In some comments on my recent paper on the classification and 
distribution of the Naiades in THE Nauriius for June, 1896, I 
notice the statement that in having a series of muscle scars in the 
middle of the disk Margaritana margaritifera, monodonta, ete. differ 
