IM ;;:>. 11. t"..' classification of fossii, im.ants. 37i> 



of (lorsiventral or of radial habit, which cannot be included in 

 any of the c^encra instituted for more i)cciiliar forms. Pro- 

 fcs.sor Skwaiid, who admits tliat the nomendaturt' for these 

 forms needs revision, remarks on tlie ohjecti(jn against the name, 

 alread\' discussed in my paper, that this generic term -includes 

 forms with leav»\s (tf the Tcuitcs type as well as branches 

 with leaves like those of Siilienolepidium, Elatidcs^ and other 

 genera'. He proposes as an alternative plan 'to retain Taxitrs 

 ill the wide sense in which it is used by most authors for 

 twigs bearing linear and usually distichous leaves similar to 

 those of Taxus, certain species of Podocarpus, Sequoia .senqx r- 

 riirns, and other recent Conifers, and to adopt the name 

 ]*'n/(02)Jn/Uu)H, for forms with radially disposed leaves like 

 those of Elatides, Sphcnolepidium, and Chcirolcpis' . 



As to the use of Ta.iites for shoots of dorsiventral habit 

 (with pseudo- distichous leaves) there is nothing to be said 

 against this plan. Brongxiart instituted the genus for forms 

 with only a general resemblance in habit to the recent spe- 

 cies of Taxus. He employed it, however, especially for Ter- 

 tiary forms which ])ossibly might be compared with the re- 

 cent genus with greater probability than those from older forma- 

 tions. U this (juestion is considered alone, it would seem con- 

 venient to retain Taxitcs as advocated by Professor Seward; 

 and 1 at first intended to employ the name in this sense. 



In regard to the other group, shoots with radial symmetr}^ 

 the question is more difficult. To use Pagioplnillnm in a wide 

 sense, for this group, would not seem to l)e an imjtrovement. 

 Fa(/ioj)ht/llu))i is usually employed as designation for a fairly 

 natural form-genus, which undoubtedly should be retained for 

 forms with short and thick, often more "or less triangular and 

 strongly keeled leaves, the species figured by Saporta (Plau- 

 tes jurassiques. Vol. T), 1884, Pis. 4;")— o')), under the name of 

 FarJu/jtl/i/lhoH being good representatives of the group, in ad- 

 dition to the type-species, ra<jiopliijllum jicrrgrinum (LiNDL. & 

 HuTT.) ScuENK. It is true that there are transitions from this 



