92 Palaeontolojjfie 



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VacctJinnn arboyenm Marsh. It is suggested that these forms represent 

 migrants from the coastal piain through the water gap of the James 

 River at a time of subsidence when most of the present coastal 

 piain was submerged by the waters of the Atlantic. ßerrj'. 



Gordon, W. T., Note on the. Pro t hall us of Lepidodendrou 

 Veltheimiamim. (Ann. Bot. XXIV. p. 821—822. text fig. 1910.) 



Prothallial cells have several times been found in the megaspores 

 of Lepidodendvon Veltheitnianuin, but in the present paper the 

 author describes the first example of the archegonium of the spe- 

 cies. In this specimen the archegonium mothercell appears to have 

 been one of the superficial prothallial cells which divide into an 

 Upper and lower cell. It appears to have been essentially similar to 

 the corresponding slructure in Selas^inella. M. C. Stopes. 



Hiekling, G., The Anatomy of Calamostachvs, Binneymia, 

 Seh im per. (Mem. Proc. Manchester Lit. and Phil. Soc. LIV. p. 

 1 — 16. pl. 1. 1910.) 



The author has particularh'- studied the details of the vascular 

 Organisation of the cone of Ca/aniostachys with a view to elucidating 

 its phylogenetic relations. He does not regard the so-called "tertile 

 nodes" as nodes at all, and shows that the sporangiospore-trace 

 virtually arises at the subjacent "bract node". A variable number of 

 bundles on the siele is observed, and the older view is substan- 

 tiated, which looked on three Single bundles and not three pairs 

 as the common axial number, The author concludes by regarding 

 C. Bi}ineya>in as the most primitive calamitian cone yet known. 



M. C. Stopes. 



Horwood, A. R., On Calamites Schiltsei Stur, and on the cor- 

 respondence between some new features observed in 

 Calamites and Equisetaceae. (foarn. Linn. Soc. London. XXXIX. 

 272. p. 277—289. pls. 18—19. 1910.) 



Specimens bearing on the structure of the pith are described, 

 and this is followed b}'- descriptions and tables of detailed measure- 

 ments of the internodes illustrating the recurring short internodes 

 in Calamites. Recent Equiseta are described, which show the same 

 peculiarities, and it is concluded that some general principle under- 

 lies these characters. The short internode in both living and fossil 

 specimens is found to preceed a new period of growtli, and may 

 possibly add strength to the stem. M. C. Stopes. 



Kidston, R., Note on the Petiole of Zv^opteris Grayi, Will. 

 (Annais Bot. XXIV. 94. p. 451-455. pl. XXXIV. 1910.) 



The author amplifies previous descriptions of the fern Zygo- 

 pteris Grayi, in the course of which he gives reasons for rejecting 

 the commonl}' used descriptive term „axillary shoot" and substi- 

 tuting the term "branch" for the structure, which is so characte- 

 ristic of the Zys^optevideae. M. P. Bertrand had united the petiole 

 Z. bibractensis var. Westphalica with the stem Z. Grayi Will., which 

 indicated to Dr. Kidstoa that it was not generally known to botanists 



