494 
CRUSTACEA. 
Antaeus fluviatilis — The Fresh-Water Astacus, or 
Craw-Fish. 
Plate XCIV. fig. 8. 
Shell terminated by a rostrum, with a lateral tooth, and a 
second one at each side of the base ; forceps unequal and finely 
granulated, with five dentations on the inner side ; lateral mar¬ 
gins of the abdomen pointed. Inhabits the rivers of Europe. 
TRIBE VII.-CARIDES. 
With the intermediate antennae inserted above the lateral 
ones, protruding and terminated by three filamentary processes. 
Its genera are, 60. Penaeus; 61. Stenopus ; 62. Alpbeus; 63. 
Hippolyte ; 64. Autonomea ; 65, Gnathophyllum ; 66. Hymen- 
ocera; 67. Nika; 6S. Palaemon ; 69. Athanus; 70. Atya; 71. 
Egeon; 72. Crangon ; 73. Pandalus; 74. Pasiphaea. 
Genus 72. — CRANGON.— Fabricius. 
Generic Character. —The anterior pair of legs larger than 
the others, provided with a large monodactyle hand; the second 
and third pairs more slender, the fourth and fifth thicker; outer 
antennae setaceous, and as long as the body; the intermediate 
divided into two filaments; shell thin, semi-transparent, having 
a short rostrum in front. 
Crangon vulgaris. — The Common Crangon, or Shrimp. 
With a single spine placed on the thorax, and another on each 
side of the rostrum ; body green and transparent, spotted with 
gray. Inhabits the sandy coasts of Europe. 
TRIBE VIII.-SCHIZOPODA. 
All the feet slender, filiform, fitted for swimming, accom¬ 
panied with a long lateral appendage, or deeply cleft, sometimes 
with many clefts at their extremities ; but none of them with a 
hand. Its genera are, 75. Mysis ; 76. Nebalia; and 77. Zoea. 
Genus 76.—NEBALIA.— Leach. 
Generic Character. —Thorax with a moveable rostrum in 
front; anterior pair of legs longest, simple ; the rest equal, ap¬ 
proximate, the last joint bifid, with many articulations. 
