APPENDIX. 355 



carp, and tench may escape destruction. The 

 ever watchful eye of a Father Providence is over 

 all his works, and he has provided means, in 

 every department of the animal kingdom, so to 

 limit the inroads of the predaceous species, that 

 a due proportion and harmonious mixture may 

 every where be maintained, and that with respect 

 to every individual species. The means are va- 

 rious, but the end is one ; and the partial evil 

 terminates in the general good and welfare of the 

 whole. 



Next to the eyes, the gills of fishes are subject 

 to annoyance from internal worms ; and amongst 

 these there is none more remarkable or wonder- 

 ful than one first discovered by Dr. Nordmann, 

 upon those of the bream, 1 and to which, on ac- 

 count of its remarkable structure and conforma- 

 tion, he has given the name of Diplozoon, or 

 Double animal. In the Classes of Polypes and 

 Tunicaries we have been introduced to many 

 animals that appear to be compound ; which, 

 from a common stem or body send forth nume- 

 rous oscula or mouths, in this emulating the 

 members of the vegetable kingdom : but amongst 

 all these plant-animals, 2 there is none can 

 compete with this of Dr. Nordmann, which, like 

 the Siamese youths, appears to be formed of two 

 distinct bodies, united in the middle so as to pre- 



1 Cyprinus Brama. ~ Phytozoa. 



