INVERTEBRATE ANIMALS. 7,3 



habitation, it is said carefully to convey the Anemone 

 to its new tenement. Within the shell, together 

 with the crab, a beautiful sea-worm. Nereis bilineata, 

 often resides, seizing and devouring without molestation 

 a share of the food captured by the crab. 



The Purse-crab, Blrgus latro, inhabits many islands 

 in the Pacific, living in holes at the roots of trees, and 

 only occasionally visiting the sea. It feeds on the nuts 

 of various palms, and is said to climb the cocoa-nut 

 trees in search of its favourite food. 

 Estimated number of species : recent, 43 ; British, 10. 



IT Examples of Cenobita, Calcinus, &c. 



Group 174.-ANOMOURA SUB-MEDIA. (Dana.) 

 Sub-tribe LITHODEA. Stone-crabs. 

 Not more than about six species are known belonging 

 to this group. 



H The Northern Stone-crab, Lithodcs Mala, is 

 found occasionally on the coasts of Scotland 

 and the Isle of Man. The colour whilst the 

 animal is living is yellowish red; that of an 

 allied species from Fuegia is cherry-red. The 

 Porcupine Stone-crab, Lithodes hystrix, is 

 from Japan. The Noduled Stone-crab, 

 Echinocerus cibarius, is from the Columbia 

 River. It is probable that all the species are 

 weak slow-moving animals, and that their 

 strange aspect corresponds in some way with 

 their more than ordinary need of protection. 



Group 175.— ANOMOURA MEDIA. (Dana.) 



Sub-tribe PORCELLANIDEA. Porcelain-crabs. 



The little Porcelain-crabs are the butterflies of the 

 class. Many species frequent coral reefs, and, as 



