Reports & Proceedings — Geological Society of London. 137 



Torksliire, which were sent to Cambridge for examination. Other 

 specimens described were obtained by the author from the Marske 

 Quarry and by the late Mr. Hawell, whose collection is now in the 

 Dorman Memorial Museum, Middlesbrough. 



The following species are dealt with : Equisetites columnaris, 

 Brongn., Sagenopterifi phillipsi (Brongn. ), var. »i«/or, Sew., Laccopteris 

 poh/podioides, Brongn., Dictyophyllum rugosum, L. & H., Stachypteris 

 halleri, a new type recently described by the author, Coniopteris 

 hymenophylloides, Brongn., and C. qui7iqueloha (Phill.), Todites 

 williamsoni (Brongn.), Cladophlelis dentieulata, Brongn., a new species 

 of Marattiopsis (a genus not hitherto recorded from Yorkshire), 

 Williamsonia spectahilis, Nath. (microsporophylls of which were, 

 found by the author, throwing adciitional light on this type of flower), 

 W. ivhithiensis, Nath., and a female strobilus identified as W. sp., 

 Zamites {Williamsonia) gigas, L. & H., Psilophyllum {W.) pecten 

 (Phill,), Taniopteris vittata, Brongn., 1\ major, L. & H., 2\ sp., 

 Wielandiella nilssoni (Phill.), formerly known as Anomozamites 

 nilssoni, Otozamites feisimanteli, Zigno, 0. graphicus (Leek, ex Bean 

 MS.), Dictyozamites haivelli, Sew., a C3'cadean stem classified as 

 Wielandiella sp., Nihsonia mediana (Leek, ex Bean MS.), N. orientalis, 

 Heer, a new species of Pseudoctenis (a genus recently founded on 

 specimens of Cycadean fronds from the Upper Jurassic of Sutherland), 

 Ginkgo digitata (Brongn.), Baieria longifolia (Pomel), Czehanowskia 

 murrayana (L. & H..), Elatides setosa (Phill.), and Taxites zamioides 

 (Leek, ex Bean MS.). 



The Marske flora, which includes several types not hitherto recorded 

 from the Jurassic plant-beds of Yorkshire, is believed to be of Middle 

 Jurassic age ; specimens previously identified as Zamites huchianus 

 (Ett.) and Nihsonia schaumhergensis (Dunk.), Wealden species, are 

 described respectively as a new species of Pseudoctensis and Nilssonia 

 orientalis, Heer. 



A note is appended by the Rev. G. J. Lane on the stratigraphy of 

 the Marske Quarry, situated on the northern face of the TJpleatham 

 outlieir, about a mile distant from Marske-by-the-Sea. The Marske 

 beds are assigned to the Lower Estuarine Series. 



2. "The Derived Cephalopoda of the Holderness Di'ift." By 

 Charles Thompson, B.Sc. (Communicated by G. "W. Lamplugh, 

 P.R.S., F.G.S.) 



Although it has been known for a century that the Drift of 

 Holderness is rich in derived fossils, for many years the collecting 

 of them was neglected. However, in recent years collections of 

 the Cephalopoda have been made, and it is now claimed that about 

 180 species of Ammonites are already in hand from the Glacial 

 Drift. There are two important points about these specimens : 

 the one, that a large number are new to Yorkshire lists hitherto 

 published ; the other, that the matrix of many of them cannot be 

 matched now by our land exposures. It remains to consider whence 

 they came. 



The whole of the Lower Lias is so well represented by all its 

 genera, and the rocky matrices are so characteristic, that it is urged 



