306 Lang.—Development of Cycadean Sporangia. 
Fig. 29. Longitudinal section of embryo borne on a short suspensor in the tissue 
of the prothallus; the archegonium-wall is broken through at its lower end. 
( x 7°0 
Fig. 30. Older embryo on long suspensor, the embryo still firmly fixed in the 
prothallus-tissue. ( x 70.) 
Fig. 31. Similar section of the largest embryo found in a seed still borne on the 
cone; the embryo shown has outstripped its competitors more completely than 
that in Fig. 30. ( x 70.) 
Fig. 32. Similar section of an embryo from a seed sown for some weeks, the 
embryo is at this stage suspended freely in the cavity formed by the destruction 
of the tissue ol the prothallus. ( x 70.) 
Fig. 33. Abnormal embryo, the suspensor having grown through the archegonium- 
neck into the archegonial depression; the remains of a small accessory embryo are 
seen below the base of the suspensor. ( x 50.) 
Figs. 1, 3-6,13, 18, 19, 21-24 and 28 from drawings, the rest from photographs. 
