ALTEUTHA. 
299 
Hab. Berwick Bay ; Dover. 
Gen. 162. ARPACTICUS, M. Edwards . 
Poot-jaws forming strong cheliform hands ; antennules 
simple; ovary single. 
Ahpacticus chelieeb, Muller, sp. — Thorax of four, the 
abdomen of six, segments ; the last one ending in two long, 
finely-serrated, bristles, fully the length of body. Head 
beaked. 
Hab. Sea-shore, Berwickshire ; Kent. 
Arpacticus nobilis, Baird.— Three times larger than the 
A . chelifer; the whole animal beautifully coloured with green, 
red, and purple ; thorax large, rounded, of four segments ; 
the body of six slender segments, the last bilobed and with 
four setse, two long and two short. 
Hab. Berwick Bay, and Dover. 
Gen. 163. ALTEUTHA, Baird. 
Eoot-jaws small, simple ; body flat. Eifth segment of 
body with two strong falciform appendages. Dr. Baird 
found the curious species on which he founded the genus 
