linnjEan arrangement. l;j 



The 4th, Zoophyta, or Animal Plants, consisting of corals, 

 sponges, &c. are mostly marine productions ; many of 

 them resemble vegetables so much that they were for- 

 merly classed in the Vegetable Kingdom, and called Stony 

 Plants : it has, however, been ascertained that they are 

 the work and habitation of numberless small animals of 

 the Polypus kind. 



The 5th, Infusoria, which are mostly microscopic objects, 

 are found in various infiisions, also in water both pure 

 and impure. 



Linnaeus divides the order TESTACEA, or Shells, into Mul- 

 Ti VALVES, Bivalves, and Univalves. The first is composed 

 of those that consist of more than two pieces ; the second, of 

 those of two pieces only, united by a hinge ; and the third, 

 of those of but one piece. The whole of these are divided into 

 35 genera. The genus named Sabella does not properly be- 

 long to the Testacea ; many of the species are only the cases of 

 the larvae of sub-aquatic flies; and the rest are all, more or less, 

 composed of extraneous matter agglutinated together ; such 

 as sand, broken shells, &c. of a finer or coarser texture, accord- 

 ing to the nature of the animal inhabitant*. 



* See Montagu's Testacea Briiannica, p. 534 ; and Linn. Trans, vol.8. 

 p. 249. 



