X] 



HUTTONIA. 



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 Stemberg^*-^ 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 Renault (82), p. 120, PI. xix.; (93), PI. xxix. figs. 8—14; (96), p. 77. 



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

 4 Renault and Zeiller (88), PI. xlvi. fig. 7. 



6 Kidston (86), p. 47; (93), p. 319. Vide also Renault (93), PI. xxvra. 

 Renault and Zeiller (88), PI. xlv. 



7 Solms-Laubach (91), p. 339. Weiss (84), p. 159. 



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

 10 Ibid. Pis. XIV. and xv. Cf. also Stur (87), Pis. vi. and viib, and 



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



" Grand'Eury (90), pp. 205, 208. Renault and Zeiller (88), PI. li. 

 " Vide Unger (50), p. 63. 



