Palaeontolosfie. 375 



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was an Alethopteris, and an account of the new Medullosan genus 

 Sutcliffia, described b}'- the author. The newly discovered seeds of 

 the Medidlosae are also considered; Trigoiiocarpus and the allied 

 StepJianosperminn are briefly described and seeds are mentioned 

 as attributed provisionally by Grand'Eury to certain groups.among 

 others to the genera Odontopteris and Linopteris. It is held that, even 

 where specialized, the organ bearing the seeds is clearly foliar in 

 nature. The evidence as to the nature of the male organs of the 

 Medullosne is touched upon. A short entirely new section on the 

 Aneimiteae is introduced. Another section, also new, discusses the 

 seed-bearing Pecoptevideae represented by Pecopteris Pliickeneti, the 

 flat winged seeds of which are said to be very like those of Dory- 

 cordaites ; what are probabl}'^ the microsporangia of such a form 

 have recentl}' been recorded by Grand'Eury, though not de- 

 scribed in detail. The difliculty that a connection was at one time 

 believed to have existed between a Pecopteris closely allied to the 

 seedbearing form just mentioned and Caidopteris usually regarded 

 as the cast of a Psaronius is brought out. This point and the fact 

 that certain Pecopterids had fructifications, presumably microsporan- 

 gia of the Crossotheca type, afford a presumption that a considerable 

 number of Pecoptevideae had seeds. Further Grand'Eury has dis- 

 covered simple ovoid seeds and large CyossotJieca-\\y.e sporangia in 

 CalUpteris: he also regards Marioptevis as a Pteridosperm. It is con- 

 cluded that the seed habit was widely spread in Palaeozoic times, 

 the füll 5^ established cases Lyginodendron , Neuropteris hetevophyüa , 

 Aneimites fertilis and Pecopteris Pliickeneti representing four distinct 

 families. The Pteridosperineae probably included most of the Neuro- 

 pterideae and Sphenopterideae, a considerable number of Pecopteri- 

 deae and various outlying genera. For certain forms whose fructifi- 

 cations are unknown Po to nie 's name Cyeadofilices is retained. The 

 account of Megaloxylon is unchahged except that the genus is com- 

 pared to the newly discovered form Sutcliffia and Zalesskya, to both 

 of which it shows certain resemblances though other differences 

 forbid the Suggestion of an affinity. Calamopitys is now made the 

 tj^'pe of a separate family; two other species besides the Devonian 

 C. Saturni are shortly described; these species show reduction and 

 locally süppression of the centripetal wood, while the secondar}" 

 xylem of one approaches that of the Cordaiteae. The sections dealing 

 with the Cycadoxyleae, Pvotopityeae and Cladoxyleae have been but 

 slightly altered. Ä few words are added as to Mr. Kidstons's as 

 yet undescribed genus Stenomyelon; its stele has a nearly con- 

 tinuous apparenth^ exarch mass of tracheides traversed b}^ bands of 

 parenchyma; its secondary wood is dense and its traces appear to 

 arise by the division of a smaller number of main Strands. The 

 chapter concludes with a discussion of the cryptogamic or phanero- 

 gamic nature of the groups considered ; the Calamopityeae , Cycado- 

 xyleae and, though less decidedly, Megaloxylon are regarded as 

 probably Pteridospernis ; the nature of the Pvotopityeae and Clado- 

 xyleae is left doubtful. The next chapter is devoted to the Cordai- 

 tales (including the Poroxyleae, Pityeae and Cordaiteae); its first 

 section has been extended by a notice of a British Povoxylon older 

 than though essentially like the French Permian species and b}^ a 

 note that on grounds of association Grand'Eury attributes seeds 

 resembling those of the Covdaiteae (R/iabdocavpns of Brongniart) to 

 the Povoxyleae. The next and completely new section gives an account 

 of the genus Pitys the secondary wood of which, like that of the 



