ZOOLOGICAL SOCIETY BULLETIN 



The Spider Crab (Libi- 

 nia emarginata) is a rather 

 sluggish species, with legs 

 sometimes spreading eigh- 

 teen inches. It is found all 

 along the Atlantic and Gulf 

 coasts in rather deep water. 

 It has the habit of placing 

 hydroids, sea weeds and 

 other marine growths on its 

 back for the purpose of con- 

 cealment. The material used 

 matches its surroundings. 

 The males are larger than 

 the females. It has no food 

 value. 



The Rock Crab {Cancer 

 irroratus) is common all 

 along the coast. It is not 

 much used for food, but is 

 sometimes sold as blue crab 

 when in the soft-shelled con- 

 dition after molting the hard 

 shell, which it does in win- 

 ter. The shell is from three 

 to five inches wide. It is 

 abundant below low tide 

 level and we have dredged 

 many in the deeper parts of 

 Long Island Sound. 



The Sergeant M a j o r 

 {Abudefduf saxatilis) is 

 much given to camouflage, 

 being at times uniformly 

 silvery, entirely black, or 

 yellowish with black bands. 

 It changes from one phase 

 of coloration to another al- 

 most instantly. It shows 

 these changes in the tanks 

 of the Aquarium, where it 

 makes itself at home and 

 lives for years. This small 

 active fish is always to be 

 seen in groups about wharves 

 in Florida and the West In- 

 dies. 



SPECIMEN ILLUSTRATIONS AM) DESCRIPTIONS FROM THE AQUARIUM G 



K NOW IN PRESS 



