134 Puget Sound Marine Sta. Pub. Vol. 1, No. 12 



PLATE 24 



41. Typical utricle with two gametangia, one containing gametes. X75. 



42. Typical utricle with three gametangia, one immature. X75. 



43. Old utricle with gametangium, utricle hair, and a scar of a hair. X75. 



44. Typical utricle with a gametangium, and with withered utricle-hair, 

 and a second hair growing below it. X75. 



45. Tip of a gametangium showing opening. X325. 



46. Gametangium with mature gametes. X325. 



47. A mature plug. X325. 



48. Plug nearly mature, just closing the filament. X325. 



49. Ping just beginning to form, showing layers in process of formation. 



X325. 



