. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 184 BULLETIN OP THE BUREAU OF I^m^m Fig. 176.—Sector from a male follicle prepared on April 1. X 900. Fixed in Flemming fluid and stained with Heidenhain iron hematoxylin. Spc, sperm mother cells or specmatocytes on wall of follicle; Spd, spermatids in center of follicle. Fig. 177.—Longitudinal section through a minor genital canal of a female mussel. X 765. Preparation same as fig. 176. CEp, ciliated epithelium which lines one side of canal only; GC, genital canal, containin
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 184 BULLETIN OP THE BUREAU OF I^m^m Fig. 176.—Sector from a male follicle prepared on April 1. X 900. Fixed in Flemming fluid and stained with Heidenhain iron hematoxylin. Spc, sperm mother cells or specmatocytes on wall of follicle; Spd, spermatids in center of follicle. Fig. 177.—Longitudinal section through a minor genital canal of a female mussel. X 765. Preparation same as fig. 176. CEp, ciliated epithelium which lines one side of canal only; GC, genital canal, containing a ripe ovum; GE, germinal epithelium containing developing ova. Fig. 178.—Longitudinal section through a freshly laid egg that has not been fertilized. The spindle of the first polar body is formed and does not pass beyond this stage normally unless the egg is fertilized. Fixed in Bouin fluid and stained with Heiden- hain iron hematoxylin and congo red. Fig. 179.—Longitudinal section through an egg showing the condition which follows immediately after impregnation. X 900- Head of spermatozoon, Sp, enlarges greatly as it migrates toward center of cell At same time spindle of first polar body- passes into anaphase stage and process of maturation continues rapidly from this time on until completed. Preparation same as fig. 176. Fig. 180.—Longitudinal section through an egg showing spindle of second polar body which is formed immediately after first polar body is extruded. Preparation same as fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States Fish Commission. Washington, The Commission, Govt. Print. Off
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