20 Seward, Jurassic Plants in the MancJiestcr Mjischvi. 



B. CVCADAI.ES. 



Williamsonia pecten (Phillips). 

 PI. iii., fig. 6 (No. 33). 



1829. Cycadites pcctcn, Phillips, G^^<9/. Yorks., p. 148, [)1. vii., 

 fig. 22. 

 C. pccti)ioidcs^ ibid., p. 125, pi. x., fig. 4. 

 1834. PtcropJiylhini pcctcn, Liiidlcy and Mutton, /''oss. 



Flora, pi. cii. 

 1849. Zaniites pecten, Brongniart, Tableau, p. 106. 



OiOf^aniites Goldiaei, ibid., p. T06. 

 1854. Palaeoaaniia pecten, Morris, Brit. Pass., p. 15. 

 1864. Palaeoaaviia hastula, Leckcnb}-, Quart. Jonrn. Gcol. 



SOC, vol. XX., [). ']']. 



Otopteris lajiccolata, ibid., p. yZ, pi. viii., fig. 4. 

 1870. Ctenophylluni pecten, Schimper, Traitd Pel. Vcg., 

 vol. ii., p. 144. 

 Willianisonia pecten, Carruthers, Trans. Linn. Soc, 

 vol. xxvi., p. 694. 

 1875. Otozaniites gracilis, Phillips, GcpI. Yorks., p. 224. lign. 

 52. 



The specimen shown in fig. 6, pi. iii., has been cho.sen 

 for illustration as it represents a good example of this 

 common type of Lower Oolite Cycadean plant, which 

 differs in some respects from the better-known form of the 

 species. Tb.e portion of frond seen in the photograph has 

 a length of 14-5 cm., and is 4 cm. broad in the widest part. 

 The rachis bears crowded linear [)innaj attached to its 

 upper surface ; each i)inna tapers to an asymmetrically 

 pointed distal end, the upper margin is practically straight 

 up to the tip, but the lower margin bends suddenly 

 upwards at the ape.x. I'he upper edge of the base of the 

 pinn;e is slightly lobed or auriculate. The veins are 

 spreading from the base, but preserve an approximately 



