VI VORICATA—— THE, ROCK LOBSTER 165 
Tribe 5. Loricata. | 
The Loricata include the Langouste (Palinurus) of the Mediter- 
ranean coasts, which replaces there the Lobster of the North Sea 
as an article of food, and the peculiarly shaped Seyllarus arctus 
(Fig. 111), which is also prized in the Mediterranean as a delicacy. 
The bright red “ Crayfishes,’ Panulirus and Jasus, of the Australian 
— 
as 
Fia. 112.— Embryonic area of developing 
Palinurus quadricornis. Ab.1, 1st abdo- 
Fic. 111.—Dorsal view of Scyllarus arctus, ae Scene SiR Cane ag eas 
x 4. (From an original figure prepared ma ese mage ye ae upper lip; 2’, 
for Professor Weldon.) lower lip; MM, mandible; Mw.1, Mza.2, 
é : Ist and 2nd maxillae ; Map. 7, 1st maxilli- 
pede; 7, 6th (antepenultimate) thoracic 
appendage. (After Claus.) 
coasts are also largely used as food. Besides its peculiarity in 
shape, S. arctus has remarkable scales on the second antennae in 
place of flagella. The larva hatches out as the so-called Phyllo- 
barred, lined, or monochrome colour-pattern may be present, which is ultimately 
induced by the nature of the environment, and does not subsequently change. In 
other species of Hippolyte, and in Palaemon and Crangon, only one adult colour- 
pattern oceurs. Thus H. varians, besides reacting to light by its chromatophores, 
possesses a permanent colour-pattern, which is also determined by environment. 
