20 
ANATOMY OF ASTRANGIA, 
Fig. 26.—Nematocyst with thread partially coiled in the cell. 
Fig. 27.—Nematocyst with inflated base of the thread. 
Figs. 28-31.—Different forms of the cell of a nematocyst with thread coiled within. 
a. Cell wall. b. Style. c¢. Thread. 
Fig. 32.—Small club-shaped nematocysts with nucleated cells. 
a,a,a. Nematocysts. d. Cell nuclei. 
Fig. 33.—Large nematocyst with thread withdrawn into the cell. 
a. Cell wall. b. Style. c. Thread. 
Fig. 34.—Nematocyst with thread protruded to its full length. 
a. Cell wall. b. Basal inflation. c. Thread. 
Fig. 835.—A portion of the basal inflation of the thread of a nematocyst highly magnified. 
Fig. 86.—The same more extended. 
Fig. 37.—Nematocyst with thread partially protruded. 
Fig. 88.—Nematocyst with thread tightly coiled in the cavity. 
Fig. 39—Nematocyst with thread half protruded. 
a. Cell wall. b. Basal inflation. oc. Thread. 
Fig. 40.—Nematocyst with the larger part of the thread protruded. 
Figs. 41-50.— Different forms of the nematocyst. 
Fig. 51.—Nematocyst with thickened superficial layer. 
a. Thick layer. c. Coiled thread. 
Fig. 52.—A similar cell with thread protruded. No basal inflation shown and thread very long, 
Fig. 53.—Same with thread contracted into the cell. 
a. Cell wall. b. Style. c¢. Coiled thread. 
Fig. 54.—Nematocyst with thread partially retracted. 
Fig. 55.—Nematocyst with thread protruded. 
Fig. 56.—Basal inflation with spiral row of “ stiff cilia.” 
Fig. 57.—A nematocyst and portion of the inflated base of the thread of the same. 
a. Cell. b. Inflated base of the thread. 
Fig. 58.—The same with “ stiff cilia” on the basal inflation. 
Fig. 59.—A portion of the coiled thread. 
Fig. 60.—Row of “ stiff cilia” from the spiral line of the basel inflation of the wall of the thread. 
Fig. 61.—Nematocyst with partially coiled thread in its interior. 
Fig. 62.—Nematocyst with the thread protruded. 
Fig. 63.—Fully developed nematocysts with the thread retracted, showing them crowded together 
Taken from an unknown region of the body. 
