. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. STUDIES ON THE ACROSOME. IV. 55 3. In the large Mytilns acrosome, three differentiated regions can be dis- tinguished, consisting of a basal structure which seems to be concerned with the extrusion of the filament; a distal region containing what is believed to be an egg- membrane lysin; and an axial structure which appears to be a tubular sheath, possibly surrounding a precursor of the filament. The same regions can be seen in the spermatozoa of Pctricola, Spondylus and Mactra. In the smaller acrosomes of Lithophaga. Cliain
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. STUDIES ON THE ACROSOME. IV. 55 3. In the large Mytilns acrosome, three differentiated regions can be dis- tinguished, consisting of a basal structure which seems to be concerned with the extrusion of the filament; a distal region containing what is believed to be an egg- membrane lysin; and an axial structure which appears to be a tubular sheath, possibly surrounding a precursor of the filament. The same regions can be seen in the spermatozoa of Pctricola, Spondylus and Mactra. In the smaller acrosomes of Lithophaga. Cliaina, Zirjaca and Crassostrca, only two regions can be dis- tinguished, and the acrosome of Trapezium is too small to show any clear dif- ferentiation. LITERATURE CITED DAN, J. C., 1952. Studies on the acrosome. I. Reaction to egg-water and other stimuli. Biol. 103: 5-4-66. DAN, J. C., 1954. Studies on the acrosome. II. Acrosome reaction in starfish spermatozoa. Biol. Bull., 107: 203-218. GALTSOFF, P. S., 1938. Physiology of reproduction of Ostrca riruinicu. II. Stimulation of spawning in the female oyster. Biol. Bull., 75: 286-307. GALTSOFF, P. S., 1940. Physiology of reproduction of Ostrca riri/inica. III. Stimulation of spawning in the male oyster. Bio!. Bull., 78: 117-135. IWATA, K. S., 1949. Spawning of Mvfilus cdnlis. II. Discharge by electrical stimulation. Bull. Japan. Soc. Sci. Fish., 15: 443-446. (In Japanese) KUPELWIESER, H., 1909. Entwicklungserregung hei Seeigeleiern durch Molluskensperma. Arch. f. Entw., 27: 434-462. McCuLLOCH, D., 1952. Note on the origin of the cortical granules in Arhacia pnnctnlata enu^ Ex p. Cell 3 : 605-607. MEVES, F., 1915. Ueber den Befruchtungsvorgang bei der Miesmuschel (Mytilns edulis L.). Arch. mikr. Anat., 78: Abt. 2: 47-62. WADA, S. K., 1936. Thermal stimulation of spawning in the Japanese pearl oyster. Siiisan Gakkwai Ho. 7: 131-133. (In Japanese) WADA. S. K., 1954. Spawning in the tridacnid clams. Jap. J. Zoo!., 11: 273-2
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