VI CONTENTS. « 



IX. On an Abnormal Spike of Ophioglossum vulgatum. By 



H. S. IIOLDEN, B.Sc, F.L.S. With 6 Text-figs. pp. i— 13 

 (Issued separately, March 2ist, i<)ii). 



X. The Boric Acids. By Alfred Holt, M.A., D.Sc. 



With 2 Text-figs pp. 1—9 



{Isszced separately-, April 20th, igii). 



XI. Studies in the Morphogenesis of certain Pelecypoda : 

 (2) The Ancestry of Trigonia gibbosa. By Margaret 

 COLLEY March, B.Sc. Plate and 3 Text-figs. ... pp. i — 12 

 {Issiied separately, A iril 20th, iQii). 



XII. Some Physical Properties of Rubber. By Prof, Alfred 

 Schwartz and Philip Kemp, M.Sc.Tech. With 11 

 Text-figs pp. I — 22 



(Issued separately, May 2nd, igii). 



XIII. The Manner of Motion of Water Flowing in a Curved 



Path. By Prof. A. H. Gibson, D.Sc pp i— S 



(Issued separately. May 4th, igii). 



XIV. On the Periodic Times of Saturn's Rings. By Henry 



Wilde, D.Sc, D.C.L., F.R.S pp. 1—3 



(Issued separately. May 8th, igii). 



XV. Studies in the Morphogenesis of certain Pelecypoda : (3) 

 The Ornament of Trigonia clavellata and some of its 

 Derivatives. By Margaret Colley March, B.Sc. 



With IS Text-figSk pp. i — 13 



(Issued separately. May 30th, igii). 



XVI. A Plesiosaurian Pectoral Girdle from the Lower Lias. By 



D. M. S. Watson, JM.Sc. With 2 Text-figs. ... pp. 1—7 



(Issued separately. May igtk, igii). 



XVII. The Upper Liassic Reptilia. Part 3. Microdeidiis Macro- 

 pterus (Seeley) and the Limbs of Alicrocleidiis homalo- 

 spondylus (Owen). By D. M. S. Watson, M.Sc. With 



3 Text-figs pp. 1—9 



(Issued separately. May 2gth, igii). 



