FISHERIES OF THE UNITED STATES. 45 



1). Peculiarities of form and growth : 



32959. "Pinclie(l" oyster from luuddy bottom. South Norwalk, Codu. 

 32930. Showiug the ettVct of traiisphiuting the " pinched" from a muddy to 



a hard bottom. South Norwalk, Conn. 

 32787. Form caused by growing in a tideway. Vicinity of New York. 

 32786. Form caused by growing in still water. Vicinity of New York. 

 32974. Curious forms of .shell. South Norwalk, Conn. 

 32782. Peculiar growth. Vicinity of New York. 



32795. Specimens of peciiliai form. Vicinity of New York. 



32971. Natural growth on stone. South Norwalk, Conn. 



32973. Natural growth on i)art of stone jug. South Norwalk, Couii. 



32972. Natural growth on shells. South Norwalk, Conn. 

 32970. Natural growth on l>(>ttle. South Norwalk, Conn. 

 32969. Natural growth on crab. South Norwalk, Conn. 



32780. Illustrating methods of attachment. Vicinity of New York. 

 32914. Blue Point " seed." Long Island, New York. 

 32789. Rosette of oysters. Vicinity of New York. 



32792. Shell growing on Mactra shell. Vicinity of New York. 

 32794. " Seed " on old rubber boot. Vicinity of New York. 



32793. " Seed" growing on stone. Vicinity of New York. 

 32895. " Seed " on rubber shoe. Vicinity of New York. 

 32894. "Seed " on bone. Vicinity of New York. 



32797. " Seed " on bark. Vicinity of New York. 



32796. " Seed " on leather shoe. Vicinity of New York. 

 32932. "Seed " on old boot-leg. Vicinity of New York. 



c. Enemies and parasites : 



32927. Specimens injured by whelk. South Norwalk, Conn. 

 32929. Specimens injured by hairj^ whelk. South Norwalk, Conn. 



32928. Specimens perforated by "drill." South Norwalk, Conn. 



32963tt. Specimen injured by boring worm (an Annelid). South Norwalk, 

 Conn. 



32956. Specimens killed by star-fish. South Norwalk, Conn. 



32963. Specimens showing ravages of Cliona or boring sponge. South Nor- 

 walk, Conn. 

 For commensal crab, see Cru.stacea. 



33092a. Lime derived from oyster shells. Use in medicine and as a fertili- 

 zer. Washington, D. C. W. H. Dall. 



SERIES OF II.LUSTKATIONS OF THE EMBRYOLOGY OF THE 

 AMERICAN OYSTER, PREPARED FOR THE MARYLAND FISH COM- 

 MISSION BY DR. AV. K. BROOKS, PH. D., OF JOHNS HOPKINS UNI- 

 VEBSITY, BALTIMORE. 



EXPLANATION OF THE FIGURES. 



Unless the contrary is stated, the figures are drawn with a 

 magnifying power of 250 diameters; Zeiss. F. 2, but it was neces- 

 sary to amplify the sketches considerably in order to repro- 

 duce, by the process of photo-engraving, the features which 

 this magnifying power rendered visible, and the figures as they 

 are leproduced are of about twice the diameter of camera 

 sketches made with the same magnifying power. 



The first thirty-two figures show the process of segmentation. 

 Figure 1 is an egg at the end of the first period of rest ; Figures 

 2, 3, 4, 5, 6, and 7, the changes during the first period of actiWty ; 



