40 
MONOGRAPH OF THE GENUS STROPHIA. 
shell, in other words, the tooth in S. pannosa is absolutely as long as in 
S. regia, although the shell is only about half as large. The mouth in 
Longidens is not widely open, nor is the margin Hanging, hut thickened 
and beveled, and, above all, the umbilicus is nearly or quite closed, not 
widely open as in Stropbiops .In Sfcrophia, as I have already remarked, 
it will be found that the natural groups, which we call sub-genera, are 
comparatively limited in disturbution hence the type of a given sub-genus 
should he selected from the area inhabitated by the greatest number of 
species. I have never yet seen a member of the sub-genus Longidens, 
taken off the Cayman Islands, which I regard as its proper habitation. 
I have to thank Dr. Dali for kindly sending me his type of Stroph- 
iops, S. regia, far examination. 
NOTES ON AN AGED LEGHORN HEN. 
1 r '° 
Ttg 
In the autumn of 1895, my friend, Mr. F. C. Browne of Framing- 
ham gave me a white Leghorn hen which, as near as he can remember, 
was about ten years old, and which had assumed secondary sexual 
characters, that, is, she had the elongated tail feathers and hackles of 
the male. These began to appear in 1894, 
at which time she began to crow. That 
year she laid two eggs only. In 1895, 
she laid one only. When she came into 
my possession in October, 1895, she had 
evidently ceased crowing, for I did not 
hear her do so while in my possession. 
When placed with some young Buff 
Cochins of my own, which were about 
two thirds grown, the old hen behaved 
much as a rooster would under similar 
circumstances, strutting about among the 
young pullets and uttering the peculiar sounds emitted by tne males 
at such times, and she would also drive the young roosters about until 
they became quite frightened whenever she appeared. 
She did not remain long "with these fowls, however, hut escaping 
one day, concealed herself among some weeds and bushes so effectually 
