352 DIVISION IV. RADIATA.—CLASS II. ENTOZOA. CLASS III. ACALEPHA. 
It is the kind most commonly met with in Germany, France, and England. 
2. Bothryocephalus latus (the Proper or Broad Tape-worm), in which the 
sexual organs are found on the flat sides of the articulations. It is met with 
only in Russia, Poland, Switzerland, and some parts of Frances and causes 
little pain. Both kinds often reach the length of twenty or thirty feet, and 
usually only detached parts pass from the body, but not that which has the 
head; before this has passed away, the worm reproduces itself; and, more- 
over, what was formerly doubted, several Tape-worms are often met with in 
one intestinal canal. 
“The symptoms of the Tape-worm are a peculiar sensation of pricking 
in the stomach, abdomen, anxiety, cramps, swoons, &c. ; but all these symp- 
toms are uncertain, and only the actual passing of pieces of the worm from 
the body is a certain proof its existence. The cure is difficult, and requires 
an experienced physician.” 
CLASS TI. ACALEPHA. 
The Radiated Animals which find their home in the waters of the ocean, 
and which have perceptible vessels ramifying the pulpy substance of the 
body, constitute this class. They are seen swimming in all seas, and are 
remarkable for their transparent, gelatinous bodies, which reflect every hue 
as the rays of the sun fall upon them. 
Swelling from almost microscopical dimensions to a diameter of two feet 
and upwards, the Acalephx, in a long row of genera and species, inhabit 
the icy as well as the temperate and torrid seas. In them also is seen the 
influence of the more energetic solar light, which in the equatorial zone 
tinges the whole animal creation with livelier colors ; for while the meduse 
of our seas are generally obscure and dull as the waters in which they swim, 
those of the torrid zone appear in all the splendor of the azure, golden- 
yellow, or ruby-red tints which distinguish the birds and fishes of the 
tropical regions. During stormy weather their delicate squadrons, incapa- 
ble of standing the shock of the wave, sink into profounder and more 
tranquil depths; but as soon as the winds are lulled they again appear on 
the smooth surface, and delight the eye of the seafarer as he traverses the 
equatorial ocean, 
The Acalephex are divided into two orders — Simple and /1ydrostatic. 
These creatures are of no direct use to man; but indirectly they render a 
service of the most important character. They partly nourish the colossal 
whale, which furnishes the oil of commerce, and millions of mollusks, which 
feed the mighty herring-shoals, whose capture gives employment and wealth 
to whole nations of fishermen. 
