Vol. 69.] THE GENUS AULOPHYLLVM. 51 



-5. On the Genus Aulophyllum. By Stanley Smith, B.A., M.Sc, 



F.G.S., Clare College, Cambridge. (Read November 20th, 

 1912.) 



[Plates V-IX.] 



Contents. 



Page 



I. Introduction 51 



II. Literature 52 



III. Sources of Material Studied 56 



IV. General Description of the Genus 5S 



V. Ontogenesis GO 



VI. Structural Variations 66 



VII. Classification and Consideration of Time-Variants... 69 



VIII. Local Characteristics and Variations 7" 



IX. Stereoplasmic Thickening 72 



X. Rejuvenescence 72 



I. Introduction. 



Aulophyllum occurs in the higher horizons (the Dibunophyllwm 

 .Zone) of the Lower Carboniferous of Great Britain, and is particu- 

 larly abundant in Scotland and the North of England. Mr. J. A. 

 Douglas has recorded ' Cyclophyllum sp.' from the Carboniferous 

 Limestone (D) of County Clare (Ireland), 1 and Dr. A. Vaughan 

 * C%iclophylla ' from the equivalent horizon at Vise (Belgium) 2 ; 

 while Kunth reported its occurrence at Hausdorf, near Glatz, on 

 the south-western border of Silesia. 3 Mr. II. G. Carruthers has 

 described a specimen from Novaya Zemlya, 4 which proved its 

 •existence at as high a latitude as 70° 49' X. Dr. G. H. Girty, 

 on the other hand, believes that the genus has not been recorded 

 from the United States. 5 



The corals studied were partly collected by myself, but for a large 

 portion of the material I am indebted to the generosity of Mr. John 

 Bishop, Mr. R. G. Carruthers, Mr. John Dunn, Prof. E.J. Garwood, 

 Dr. W. T. Gordon, Mr. Leonard Gill, Mr. Thomas Herdman, 

 Dr. Wheelton Hind, Mr. W. B. R. King, Dr. F. L. Kitchin, Mr. A. 

 IF. Sandys, Dr. T. F. Sibly, Mr. C. T. Trechmann, Dr. Arthur 

 Vaughan, Mr. F. H. Walker, Mr. Geoffrey Weyman, and Dr. Albert 

 "Wilmore. 



The preparation of material, its examination, and the literary 



1 ' The Cai-boniferous Limestone of County Clare (Ireland) ' Q. J. G. S. 

 toI. lxv (1909) p. 555. 



2 ' Faunal Succession in the Lower Carboniferous (Avonian) of the British 

 Isles ' Rep. Brit. Assoc. 1910 (Sheffield) table facing p. 103. 



3 See Bibliography, §11 [11]. 

 1 Ibid. [14]. 



5 Private communication. 



