15 
In some rock pools — or ponds — on the shore of Hawaii, 
near the little town Hilo I observed a small black-and-white spot- 
ted crab, which was always found attached to the large, black 
Holothurians living here. That here is a case of protective color- 
Fig. 9. A small Dromiid carrying on its back an empty bivalve shell, which covers 
it ra Feireg so that the crab is perfectly invisible from above. —- Fig. 10. Oreo- 
peer US Sp., a Crab bearing the most perfect resemblance to a piece of dead, eroded 
ca. 20 fathoms ; 
Coral. The Younger specimen has lost one of its claws. From off rs 
— Fig Zebrida Adamsii 
dig a bottom with coral single, Lithothamnias a. 0 3 
hite. — Fig. 12; A Hippolytid, covered with fine hairy Fase resembling small 
algæ. All figures nat, 
ation can hardly be doubted; in the same time the crab gets the 
Protection afforded by its host, whose Cuvierian organs must make 
It an object feared by its assailants. I have not succeded in finding 
the crab as yet among the large collections brought home from 
the Expedition, so that the name of this interesting species cannot 
be given. 
Among the shrimps hardly any special case of protective re- 
Semblance is known, outside the communities of the sand fauna, 
Sargasso fauna etc. Beddard (p. 191) calls attention to the pe- 
Culiar eye-like markings on the shrimp Angasia pavonina de- 
