X] 



HUTTONIA. 



363 



into short pointed teeth. The internal structure of Macrostachya 

 has not been satisfactorily determined. An account by Renault^ 

 of a petrified specimen does not present a very clear idea as to 

 the structural features of this form of Calamitean strobilus. 



The association of Calamitean vegetative shoots and cones. 



The generic name Huttonia, suggested by Sternberg'^^ in 

 1837, is applied to cones which closely resemble Macrostachya 

 in habit, but differ — so far as our scanty knowledge enables us 

 to judge — in the arrangement of the members. The student 



1 Eenault (82), p. 120, PI. xix.; (93), PI. xxix. figs. 8—14; (96), p. 77. 



2 Weiss (84), p. 98, PI. xx. etc. ^ Sterzel (82). 

 ^ Eenault and Zeiller (88), PI. xlvi. fig. 7. 



« Kidston (86), p. 47; (93), p. 319. Vide also Eenault (93), PI. xxviii. 



Eenault and Zeiller (88), PI. xlv. 

 ' Solms-Laubacli (91), p. 339. Weiss (84), p. 159. 



8 Weiss (84), PI. xx. fig. 6. " Weiss (84), PI. xx. fig. 7 ; PI. xxi. fig. 4. 



i» Ibid. Pis. XIV. and xv. Of. also Stur (87), Pis. vi. and viib, and 

 Lesquereux (84), Pi. xc. fig. 1. 



11 Graud'Bury (90), pp. 205, 208. Eenault and Zeiller (88), PI. Li. 



12 Vide Unger (50), p. 63. 



