1883.] The Siphonophores. 833 
noticing the presence of a covered basket of carrion placed among 
them, decided him forever against the ideas I have endeavored to 
prove in this paper. 
I find in the introduction to “ A Manual of the Ornithology of 
the United States and Canada,” by Thomas Nuttall, a short para- 
graph referring to this self-same experiment, and, as it echoes the 
sentiments of his friend Audubon, whose follower he was, with 
other naturalists of that day, I will finish by its quotation: 
“Comparing animals with each other we soon perceive that 
smell in general is much more acute among the quadrupeds than 
among the birds. Even the pretended scent of the vulture is im- 
aginary as he does not perceive the tainted carrion on which he 
feeds through a wicker basket, though its odor is as potent as in 
the open air.” 
ee 
THE SIPHONOPHORES. 
BY J. WALTER FEWKES. 
(Continued from February number, 1882.) 
V.—Tue DIPHYÆ. 
Tere remain of tubular Medusæ yet to be mentioned a few 
genera closely related to Diphyes! which form a characteris- 
tic group called the Diphyæ.? While all of these jellyfishes like 
Agalma and the majority of its relatives are furnished with a long 
tube like axis, none of them have at one end of this stem an air 
bladder for flotation in the water or upon its surface. Most of the 
animals which we are now to consider have swimming-bells as 
means of self propulsion by which they move through the water 
with a velocity which is very great when compared with many of 
their float-bearing relatives. As a rule, however, the members of 
the division are smaller than the Physophore, and the gelatinous 
substance of their swimming-bells is generally of a firmer con- 
Sistency. The group may be said to include some of the most 
specialized forms of the Siphonophores. 
The Diphye with the exception of at least one genus called 
1 For a popular account of the anatomy of Diphyes the reader is referred to the 
AMERICAN NATURALIST for February, 1882. 
? The terms Physophoridz and Diphyidz are family names and should give place 
en ag and Diphye, which may be applied to groups containing several 
Ies, i ; x 
