﻿ADDENDA ET CORRIGENDA. 



Page 4, line 8, read Maryland Academy of [Sciences]. 



Page 1 1 , second clause of first complete sentence at top of page is misleading. State- 

 ment should be : an old peduncle is present in the axil of nearly every leaf 

 base over large areas of the trunk surface. Cf. closing lj of page 185. 



Page 19. Wealden cycads : Bcnnettites {Sax by anus]. 



Page 25. In third paragraph, Pterophyllum is to be read Ptilophyllum . 



Page 25. It should be added to the third paragraph, thai like the mature leaves, the roots 

 of fossil cycad trunks uniformly fail of silieification. 



Page 104. Closing sentence is obscure. The leaf and scale leaf succession of the 

 fossil cycad trunks is far from sufficiently studied; although it is surmised 

 that most species bore foliage leaves only, whereas in the existing cycads 

 many species bear fully as numerous scale as foliage leaves, while but a 

 very few species bear foliage leaves only. A study of the rate of trunk 

 elongation as conditioned by the several types of scale and foliage leaf suc- 

 cession in existing cycads must aid in determining the approximate rate of 

 growth and age of the fossil trunks. 



Page 107. To fourth sentence. The first cycad trunk sections made are probably those 

 presented by Witham to Buckland, and studied by Robert Brown. 

 Diagrammatic figures of these sections are given by Buckland (18, vol. II, 

 plates 61 and 62). 



Page 176, in last paragraph, eighth line, read Plate VI [No. 12]. 



Page 177, in last paragraph, first line, read Plate VI [No. 12]. 



Page 240, line 25, eighth word [reproduction]. 



Text figures 14, 89, and 94 show three views of Yale cycad trunk 214 (Cycadeoidea daeo- 

 lensis, cotype), after the removal of a study series of floral axes. A view of 

 the trunk as collected is given on Plate VI, No. 12. Photographs of 

 various sections from the axes numbered in the several figures are located 

 as follows : 



Fig. 14 



Fig- 94 



fAxis Plate 



I V XL, photos. 1-8. 



] VI XXXIX, phot. 1. 



VII XXXIX, phot. 4. 



XI [Similar to axis IV and VI.] 



XIV XXXVIII, photos. 1 and 2. 



f I, cf. 89; II, cf. 89; (III), Plate XXXVI, 

 photos, -i-zd: IV, cf. 89; V, cf. 89; VI, 

 cf. 14; VIII, cf. 89; X, cf. 89; XI, sim- 

 ilar to axes IV and VI. 



Fig. 89 



rAxis Plate 



I XXXIV, phot. 2. 



XXXV, photos. 2-2C. 

 XXXVII, photos. 1-5. 



II XXXIX, phot. 3. 



IV XLI, photos. 1-7. 



V XL, photos. 1-8. 



VI XXXIX, phot. 1. 



Y1II XXXIX, phot. 2. 



X XLII, photos, i-ic. 



296 



