* XIV FAUNA OF SOUTH CAROLINA. 
11, DIVISION. ANNULATED ANIMALS. 
No internal osseous skeleton, but generally a tegumentary one, composed of moveable rings. 
Organs symmetrically placed about a vertical median plane. No cerebro-spinal axis. Nervous 
system central, generally a series of ganglia. 
I SUBDIVISION. ARTICULATA. 
Organs of locomotion composed of several segments articulated with each other. Nervous sys- 
tem highly developed. : 
1. CLASS. INSECTA. 
Respiration aerial. Body composed of a head, thorax and abdomen, distinct from each other. 
Three pairs of feet, attached to the thorax. 
A class abounding in species, probably not less than 5000 in South Carolina. We have not been 
able to procure an authentic list of the more common or most important species. 
IL CLASS. MYRIAPODA. 
Respiration aerial. Body composed of a head and a series of thoraco-abdominal rings. Nume- 
rous pairs of feet. Centipede, Fortyleg, &c. 
Il. CLASS. ARACHNIDA. 
Respiration aerial. Head and thorax in one piece, to which are attached four pairs of feet. 
Spiders, &c. 
We have not been able to procure authentic lists of species in these two classes. 
IV. CLASS. CRUSTACEA. 
Respiration aquatic, effected generally by gills or branchie. Circulatory system highly de- 
veloped. Generally five or seven pairs of feet. Sexes distinct. 
I. ORDER. DECAPODA. 
Mouth formed for mastication (as also in the eight following orders) and furnished with six pairs 
of members, one pair mandibles, two pair jaws, and three pair foot-jaws, the last of these covering 
the mouth externally. Eyes on moveable peduncles. Head not distinct from the thorax, both 
protected by a continuous shell, not separable into segments. Five pairs of feet, prehensile, ambu- 
latory or natatory. Gills enclosed in cavities on the side of the thorax. 
A. Brachyura. 
Abdomen but slightly developed, folded under the body. 
1. Family. Oxyrhincha. 
Shell triangular in form, tapering anteriorly to a beak, sometimes much prolonged. Mouth- 
frame nearly square, remote from the front. 
1. Leptopédia Leach. 2. Libinia Leach. 
1. calcarata* - Say. | 2. canaliculata Say. Spider Crab 
