a 
40 GRAND DIVISIONS. 
The process of reproduction among this di- 
vision of animals resembles that of plants with 
perfect flowers, Some of them may be propaga- 
ted by cuttings like plants. In this, and in some 
other | particulars, they seem to partake of the na- 
ture of plants and animals ; and are therefore cal- 
Jed zoophytes, or animal-plants. ‘They are the 
most simple in their organization, and seem to 
have been some of the earliest inhabitants of the 
earth ; as some of the species are found in the 
oldest rocks, which contain any petrifactions. 
Example. Sea-hedghog, starfish, sea-nettle, 
cerals, corallines, animalcule, tape-worm, 
II. MOLLUSCOUS ANIMALS. 
In this division the sentient principle is lodged 
ina number of medullary masses, dispersed in 
different parts of a soft body. And though the 
medullary masses are not always united by nervous 
jilaments, the organs of sense and motion are ar- 
ranged more or less on tieo sides of a nervous axts 
or longitudinal series of medullary masses. 
The principal medullary mass is situated upon 
the throat. ‘ihe circulatory system is considera- 
bly complicated ; much more so than that of the 
articulated division. The bleod is dark colour- 
ed or blue.. Fibrin appears more abundant than 
in vertebral animals. ‘heir muscles are attach- 
ed to many parts of the skin, forming a tissue 
more or less complicated and compact. By va- 
rious contractions and clongations they move, 
swim, and perform other, motions. They have 
considerable irratibility ; ‘the naked skin is very 
be 
