feffing the power of contrafting or opening at plea- 
fure the cavity of their extremities; they are very 
tranfparent, and fometimes exhibit a rich appearance 
of varying colors. Several are frequently found ad¬ 
hering clofely together in a lateral diredlion. It may 
not be improper to add that the animals of the ge¬ 
nus Salpa feem extremely nearly allied to thofe of 
the genus Dagyza, firft difcovered by Sir Jofeph 
Banks and Dr. Solander, near the coafts of Spain. 
Perhaps the two genera of Salpa and Dagyza might 
be incorporated without any violation of propriety: 
the Salpae, in general, are natives of the Mediterra¬ 
nean fea. 
