.0 MR. W. CARRLTHERS ON FOSSIL CYCADEAN STEMS 



Sp. 1. Y. Morisiiy Carr. ; squamis et basibus petiolorum horizontalibus, non imbricatis, apice tfuncatis, 



tumidii 

 Form. 



wer Cretaceous, Loc. Potton, Bedfordshire. 

 gracilis, sp. nov. ; trunco tenuissimo, squamis 



tis, cicatricials rhomboideis. 



Form. Lias. Loc L\me Regis, Dorsetshire. 



Sp. 8. JT. crassa, sp. nov.; trunco humili, squamis et basibus petiolorum patentibus vix imbricatis, 

 < rassis, transverse subovoideis. 



Form. Middle Oolite, Loc. Brora, Sutherlandshire. 



Sp. 4. Y. Joassunia, sp. nov. j trunco erecto, basibus petiolorum brevibus vix imbricatis, squamis ad 

 basin strobilorum confertis. 



Form. Middle Oolite. Loc. Brora, Sutherlandshire. 



Gen« 3. Pittonia, gen. nov. Truncus obovatus humilis, squamis et petiolorum basibus magnis geni- 

 ii lat is persistentibus tectus. 



Sp. 1. F. sqttamata, sp. nov. j squamis oblongis apice obtuse rotundatis, basibus petiolorum infra articu- 

 u ion cm constrictis. 



Form. [Jpper Cretaceous. Loc. Bonchurch, Isle of Wight. 



(Jen. 4. Crossozamia, Pomel. Truncus oblongo-ellipsoideus, petiolorum basibus brevibus subimbricatis 

 tectus j folia pinnata, petiolata, pinnis basi contractis lineari-lanceolatis oblongisve ; spadices feminei in 

 rtrobiloa dispositi, imbricati, adpressi, lanceolati, flabellatim laciniati. 



Sp. 1. C. Moreaui, Pomel; stipite oblongo, petiolorum residuis infimis patentibus, supremis adpressis 



dnrso ralde carinatis. 



Form. Jurassic. Loc. St. Michel, France. 



■ r 



Sp. 2. C. Buvignieri, Pomel; "An pnecedentis varietas?" Pomel. 

 Form. Jurassic. Loc. St. Michel, France. 



Tribus II I . Williamsoniei, trib. nov. 



1- lores masculi circa spadicem cylindricum aggregati ; spadices feminei peltati, infundibuliformes 

 bieulati, multifidi, ovula plura gerentes, 2 utrinque ad latera costa? segmenti symmetrice disposita. 



(ion.:.. Williamsoma, gen.nov. Truncus cylindricus, stigmatibus 



petiolorum 



baseos 



margmibus libera ; flores termin 



arr 



i s, alterni- 



rato-aeuminatis, basi attenuatis j segmentis nume- 



libcros basales e\i»;ue divaricatis. 



Form. Inferior Oolite. Loc. Scarborough, Yorkshire. 



W\ Pecten, Carr. ; foliis parvis linearibus apice et basi attenuatis j segmentis 



cati- 



margmes 



Form. Inferior Oolite. Loc. Gristhorpe, Yorkshire. 



bJLLT' ha T la> °, arr " ' f ° liiS lanceolatis a P ice ^ basi attenuatis, segmentis numerosis lineari- 

 se divaru^' 1S ' SUbimbricatis ' P at ^tibus ; nervis parallelis in margines liberos basales 



F*rm. Inferior Oolite. Loc. Saltwick, Yorkshire. 



