16 CLASSIFICATION. $ 2. 
THIRD GROUP. 
VERMES. 
Animals with an elongated, symmetrical body, and whose organs are 
arranged along a longitudinal axis; so that right and left, dorsal and 
ventral aspects may be indicated. 
The central nervous mass consists of a cervical ganglion, with or with: 
out a chain of abdominal ganglia. 
Crass VI. Hetminvues. 
Crass VII. TourseLvari. 
Crass VIII. Rorarortz. 
Crass IX. ANNOLATI. 
FOURTH GROUP. 
MOLLUSCA. 
Animals of a varied form, and whose bodies are surrounded by a fleshy 
mantle. The central nervous masses consist of ganglia, some of which 
surround the cesophagus, and others, connected by nervous filaments, are 
scattered through the body. 
Crass X. ACEPHALA. 
Crass XI. CrpHaLornora. 
Crass XII. Cepuatopopa. 
FIFTH GROUP. 
ARTHROPODA. 
Animals having a perfectly symmetrical form, and articulated organs 
of locomotion. The central masses of the nervous system consist of a 
ring of ganglia surrounding the cesophagus, from which proceeds a chain of 
abdominal ganglia. F 
Crass XIII. Crustacea. 
Ciass XIV. Aracunipa. 
Cuass XV. Insecta. 
BIBLIOGRAPHY. 
§ 2. 
Besides the various ancient and modern works upon general comparative 
anatomy, —such as those of Blumenbach,? G. Cuvier,? F. Meckel,® E. 
Home,” Blainville,” Delle Chiaje,© Carus,” Grant, Rymer Jones, Strauss 
1 Handbuch der vergleichenden Anatomie. Gét- 
tingen, 1824. 
2Lecons d’Anatomie comparee. Paris, 1799- 
1805. Translated into German and published with 
notes and additions by Meckel and Froriep. 4 vols. 
Leipzig, 1809-10. 2nd edit. Paris, 1835-45. 
System der vergleichenden A i 
Halle, 1821-33. 
4 Lectures on Comparative Anatomy. 6 vols. 
London. 1814-29. 
6 vols. 
5 De l’Organisation des Animaux, ou Principes 
d’Anatomie comparée. Tom. I. Paris, 1832. : 
6 Tstituzioni di Anotomiae Fisiologia © 
Napoli, 1832. 
7 Lehrbuch der vergleichenden Anatomie. 2nd 
ed. Leipzig, 1834. ; 
eo of Comparative Anatomy. London, 
* A General Outline of the Animal Kingdom, and 
ie lof ive A y. London, 1841. 
parata. 
