826 THE INHABITANTS OF THE SBA. 
crystalline tube, through which one can distinctly see the internal 
coloured parts. Sometimes these animals, which abound in the 
Salpa maxima. 
a. Upper lip or posterior orifice. 8. Anterior orifice. c. Prolongations of the test by which the 
animal is adherent to its neighbours. 
warmer seas, are found solitary, at other times associated in cir- 
cular or lengthened groups, termed garlands, ribands, and chains ; 
but, strange to say, these two forms so different in outward 
Salpz, isolated and associated. 
A Salpa runcinata, solitary. B. Salpa runcinata, associated. C. Salpa xonaria, aggregated. 
appearance are only the alternating generations of one and the 
same animal. The chained Salpz produce only solitary ones, and 
the latter only chains, or, as Chamisso, to whom we owe the dis- 
covery of this interesting fact, expresses himself, “a salpa. mother 
never resembles her daughter, or her own mother, but is always 
like her sister, her grand-daughter, or her grand-mother.” When 
Chamisso first made known his discovery, he was laughed at as 
a fanciful visionary, but all later observations have not only 
fully confirmed his statement but also discovered similar or 
even more wonderful metamorphoses among the jelly-fish, 
polyps, crustacea, sea-urchins, and other marine animals. Thus 
Chamisso gave the first impulse to a whole series of highly 
interesting observations, and his rank is now as well established 
among naturalists as it has long been among the most distin- 
