[67] 



FISHERIES OF THE UNITED STATES. 



Ostrea Virginica, Graelin. American Oyster— Continued. 



Figure 48.— The seminal fluid of a ripe male oyster, mixed with water, 

 and seen with a power of 80 diameters. Zeiss, a. 2. 



Figure 40.— Fluid from the ovary of a ripe female oyster, seen with the 

 same magnifying power. 



Figure 50.— Seminal fluid of a ripe male oyster, magnified 500 diameters. 



Figure 51.— Egg a few minutes after mixture with the male fluid magni- 

 fied 500 diameters. 



Figure 52.— Egg about thirty minutes after fertilization magnified 500 

 diameters. 



Figure 67.— Section of a portion of the visceral mass of a male oyster mag- 

 nified 250 diameters. The surface epithelium of the body is shown at the 

 lower end of the figure. Above this is a loose, thick layer of wrinkled cells, 

 which have the appearance of adipose cells from which all the fat has been 

 removed. Above this layer is a large duct, lined with epithelial cells, and 

 filled with ripe spermatozoa, which have been poured into it from two 

 follicles which communicate with it on each side. Above this are sections 

 of a number of the follicles of the testis, in three of which the contents are 

 figui-ed. 



Figure 53.— Section of a portion of the visceral mass of a female oyster 

 magnified 250 diameters; a. epithelium of the surface of the body; b, layer 

 of connective tissue ; c, layer of wrinkled cells, which are probably fat cells, 

 from which all the fat has been removed; /, sections of ten ovarian fol- 

 licles ; e, the ovarian eggs. 



Figures 54-66.— Abnormal or direct form of segmentation. 



SERIES OF PHOTOGRAPHS ILLrSTRATIXG ATTACHMENT AND GROWTH OP 

 "spat" and oysters, investigations of FRANCIS WINSLOW, U. 8. N., 

 ASSISTANT U. S. COAST AND GEODETIC SURVET, 1879. 



SERIES OF SPECIMENS ILLUSTRATING ATTACHMENT OF SPAT. 



33391. Jamaica Bay, L. I. C. E. Vreeland. 



,33519. Saunders' Point, Povidence River. Soft bttom. Jason S. Pierce. 



32802. Bayou Cook, Louisiana. Alex. Gordon. 



32796. Blue Point, Long Island. " Seed " on leather shoe. B. J. M. Carley. 



33618. Oyster Bay, Long Island. Growth on stone. H, A, Townsend. 

 32973. Long Island Sound. Growth on part of stone jug. Hoyt Bros. 



32792. Blue Point, Long Island. Growth on Mactra shell. B. J. M. Carley. 

 32958. Long Island Sound. Growth on various "stools." Hoyt Bros. 

 32958. Long Island Sound. Growth on "King crab." Hoyt Bros. 

 32958. Long Island Sound. Growth on stone. Hoyt Bros. 



33390. Huntington Harbor, Long Island. Growth on stone. Wilson 

 Beardsley. 



32793. Blue Point, Long Island. Growth on stone. B. J. M. Carley. 



32970. Long Island Sound. Growth on bottle. Hoyt Bros. 



32971. Long Island Sound. Growth on stone. Hoyt Bros. 



32894. Blue Point, Long Island. Growth on bone. B. J. M. Carley. 



3151. Long Island Sound. Growth on stone. Hoyt Bros. 



33619. Patchogue, Long Island. Growth on clay pipe. F. C. Dayton. 

 329.32. Blue Point, Long Island. Growth on boot-leg. B. J. M. Carley. 



33572. Potomac River oyster transplanted June, 1882, to Delaware Bay. 



Peculiar growth. Thos. J. Love. 



33573. Delaware Bay. " Set" five months old. Thos. J. Love. 



33620. Providence River. Growth on crab. Monsell & Dewing. 



32794. Blue Point, Long Island. Growth on rubber boot. B. J. M. Carley. 



