xvi FAUNA OF SOUTH CAROLINA. ‘ 
C. Macroura. 
Abdomen highly developed, extended behind the thorax, furnished with appendages on the 
penultemate segment, which with the last segment form a fanlike caudal fin, a powerful organ 
of locomotion. 
24. Callianassa Leach. 28. Pontonia Lat. 
34. major Say. 39. occidentalis _L. Gibbes. 
25. Gébia Leach. 29. Hippélyte Leach. Freshwater 
35. affinis Say. AO. caroliniana Gibbes. Shrimp. 
26. Astacus Fab. 30. Paleemon Fab. 
36. Bartoni Fab. : 41. vulgaris Say. Hardbacks. 
37. Blandingi Harleis coon 31. Penéus Fab. 
27. Alpheus Fab? 42. setiferus Lin. nr 
38. heterochélis Say. 43. caraméte Rond. OES: 
II. ORDER. STOMAPODA. 
Eyes on moveable peduncles. Gills not enclosed in thoracic cavity, generally attached to the 
false feet of the abdomen, which part of body is in general highly developed. Feet in seven or 
eight pair generally. 
32. Squilla Fab. ? 
44. scabricatida Lat. 
45. emptsa Say. 
46. neglécta L. Gibbes. Not yet described. 
47. dabia M. Ed. 
III. ORDER. AMPHIPODA. 
Eyes sessile. Head, thorax and abdomen distinct, composed of separate rings. No proper gills, 
but vesicles supplying their place. Abdomen highly developed. Body frequently compressed. 
Seven pairs of feet. 
33. Orchéstia Leach 35. Gammarus Fab. 
48. longicérnis Say. 51. mucronatus Say. 
34, Amphithoe Leach 52. fasciatus Say. 
49. dentata Say. 
50. not determin- 
ed. 
IV. ORDER. LAMIPODA. 
Eyes sessile. Head, thorax and abdomen distinct, the latter rudimentary. Branchial vesicles in 
place of branchiz. Feet in seven or five pair. 
36. Caprélla Lam. 
53. equilibra Say. 
44. geométrica Say. 
V. ORDER. ISOPODA. 
Eyes, head, thorax and abdomen as in Amphipoda. No branchie or branchial vesicles, the 
abdominal feet supplying their place. Body depressed. Seven pairs of feet. 
