80 
A COB.NISH FAUNA. 
Its geographical range is from the Orkneys, where it reaches; 
its largest size, to the Mediterranean. On onr coast it ranges 
from the shore to about three fathoms of water, and is very 
common. 
PoEOELLANA LONSicoENis. — Pennant, pi. 2. 
Pisidia longicornis. — Leach, Diet. dee. set. nat., xviii, p. 54 (not 
Malac. Brit.y, Milne Edwards, Mist des Crust., Vol. 2, p. 257 ; Bell, 
Stalk- Eyed Crust, p. 193. 
Porcellana Leaohii. — Gray, Zool. Miscel,, p 45-, Couch, Cornish 
Fauna, p. 76. 
Common on zoophytic and rocky ground, from one to forty 
fathoms of water. It seldom frequents the shore above half-tide. 
I think that there can be little doubt but that Mr. Bell is 
correct in his opinion that Porcellana acanthecheles of Couch’s 
previous Cornish Fauna is but a young specimen of this species. 
galatmiaem:. 
Genus, Gajdathea. — Fair. 
“ Carapace covered with transverse sections edged with short 
hair ; snout (rostrum) advanced and spirey ; half of the abdomen 
(pleon) permanently bent under.” 
Carapace depressed ; anterior pair of legs chelate, equal, flat, 
long ; posterior pair feeble, unfit for walking ; abdomen (pleon) 
broad, flat ; posterior pair of pleopoda (tail) broad, flat ; telson 
wide. 
Galathea sxeigosa (Plated Lobster) ; Linn. 
G. spinigera. — Leach, Malac., pi. 28 ; Pennant, pi. 14, p. 26 
Milne Edwards, Mist, des Crust., t. 2, p. 323 ; Bell, Stalk-Eyod 
Crust., p. 200. 
“Common, and in its yoimger state not easily distinguished from 
G. squamosa. It is incapable of any motion but backward, and 
rarely rises above the hottom, when by a laborious motion of it® 
tail it continues to retreat from its enemies ; and its usual pro- 
gress is creeping, and by its legs only.” 
Mr. Couch’s observations must have been on the sea-shore 
when the animal is out of the water. In the sea, Galathea a® 
well as Porcellana, having the power of swimming very rapidly» 
and this they do mostly with the power of the whole tail (e^' 
pleon.) 
