38 CYCADITES. 



1875. C. reetangularis, Saporta, Pal. Fran(;. vol. ii. p. 69, pi. Ixxxiiil 

 figs. 1-4. 

 Cf. 0. Delessei, ibid. p. 73, figs. 5-7. 

 1884. C. eoncentriciis, Eichards, Synopsis Foss. Cycad. p. 1. 

 1893. C. concmtricus, Woodward, Lias, p. 378. 



C. reetangularis, ibid. p. 378. 

 1895. C. reetangularis, Lignier, Mem. Soc. Linn. Kormandie, vol. xviii^ 



p. 27, pi. vii. fig. 19. 

 1902. Cf. C. SalacUni, Zeiller, Flor. foss. Toulcin, pi. xli. 



Frond pinnate ; rachis broad, bearing narrow linear and crowded 

 pinnas ; pinnae attached laterally by a broad base, of uniform 

 breadth., terminating in an acuminate tip, they may be either at 

 right angles to the axis of the frond or curved slightly upwards ; 

 the lamina is traversed by a well-defined midrib. 



The genus Cycadites ' is less abundantly represented in Mesozoi& 

 floras than the comparatively frequent use of the name implies. 

 Sternberg's generic name was formerly used as a general designation 

 of Cycadean fronds which have since been separated intp several 

 distinct genera. Other leaves have been referred incorrectly to- 

 Cycadites instead of to the genus Dioonites ; if, as occasionally 

 happens in fossil as in recent Cycadean fronds, the lamina of the 

 pinnse has a revolute margin, an impression or cast presents an 

 appearance suggestive of a midrib. Among existing Cycads th& 

 species Encephalartos OhelUnchii, Lem.,^ affords a good example of 

 a frond that might be easily mistaken for a Cycadites if preserved 

 as a fossil. 



Cycadites reetangularis has a fairly wide distribution in Ehfetic 

 and Lower Jurassic strata, and represents a typical example of the 

 genus. Unusually large and well-preserved Wealden specimens- 

 of Cycadites have been described from England and Portugal 

 respectively as Cycadites Saportts, Sew.,' and C tcnuisectus. Sap. ^ ^ 

 in all probability these two specific names stand for one species. 



52,665. PI. IV. Figs. 4, 4a. 



Part of a frond 20'5 cm. in length. The rachis is 1 cm. broad, 

 and bears numerous linear pinnse, none of which are complete ^ 



' Solms-Laubach (91), p. 86 ; Seward (95), p. 23. 



2 Seward (98=). 



' Seward (95), p. 29, pis. iii., vi., viii. 



' Saporta (94), p. 171, pi. xxxii. 



