LONG-TAILED GROUP 



3233 



of which, the crawfish (Palimirus vulgaris}, may be seen for sale in England. 

 It is larger than the lobster, and has enormously long stout antennae, and a spiny 

 carapace but no claws. This species is figured on the left side of the colored plate. 

 The second family, Scyllarida, contains a considerable number of genera (Scyllarus, 

 Ibaciis, etc.), mostly from tropical seas, remarkable for having the carapace broad 

 and flattened, with the eyes inclosed in complete orbits on its upper surface, 

 and the antennae short and scale-like. In this tribe the larvae are unlike those of 

 crabs or lobsters. On account of their transparency and delicacy they are called 



COMMON CRAWFISH. 

 (Slightly reduced.) 



glass-crabs. The body is formed of three distinct parts, a large round-sided head, 

 a smaller but also round-sided thorax, and a minute jointed abdomen which projects 

 like a short tail from the hinder end of the thorax. The abdomen bears no limbs. 

 The lobsters and crawfish (Astacidea) have at least three pairs of the large 

 thoracic limbs pincer-like, the first being much larger than the others. The 

 antennae are furnished with a distinct basal scale-like plate. The first family 

 (Eryontidce) contains several genera found in deep water in various parts of the 

 world, the slender-clawed Willemcesia leptodactyla occurring in both the Pacific and 



Atlantic Oceans, at depths varying from thirteen hundred to over two thousand 

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