VI CONTENTS. 



Page 

 Leprieur ; On a Monstrosity of Haliotis (albicans'?), by Dr. J. E. 

 Gray; On the Perforated Structure of Rhynchonella Geinitzi' 

 ana, by William King ; On the Nucleus of the Operculum of 

 Cyclostoma elegans, by Dr. J. E. Gray; On Object-slides of 

 Canary Glass, by Prof. Ernst Briicke ; On two new species of 

 Humming Birds belonging to the genus Amazilius, by J. Gould, 

 F.R.S 346—352 



NUMBER CXIII. 



XXVI. Researches on the Development of the Pectinibranchiata. 



By J. KoREN and D. C. Danielssen. ("With two Plates.) 353 



XXVII. A Revision of the Genera of some of the Families of Con- 

 chifera or Bivalve Shells. Part III. Arcadce. By John Edward 

 Gray, Ph.D., F.R.S., F.L.S. &c 366 



XXVIII. On a new species of Macgillivrayia. By Arthur 

 Adams, S.R.N., F.L.S. &c 373 



XXIX. Descriptions of new Ceylon Coleoptera. By John Niet- 

 NER, Colombo, Ceylon ^ 374 



XXX. Note on a Nematoid Worm, parasitic upon Termites. By 



C. Lesp^s 388 



XXXI. Brief Description of a Ctenostomatous Polyzoon, allied to 

 Vesicularia, occurring on the Australian Coast. By John Denis 

 Macdonald, Assistant Surgeon R.N 390 



XXXII. Anatomical Description of a species of Asteroid Polypes, 

 probably forming the type of a new genus oi Alcyonidce. By John 

 Denis Macdonald, Assistant Surgeon R.N 391 



New Books : — Dr. Jacob Sturm's Deutschlands Flora in Abbildungen 

 nach der Natur mit Beschreibungen. Fortgesetzt von Dr. J. W. 

 Sturm. — Iconographia Familiarum Naturalium Regni Vegetabilis 

 delineata atque adjectis Familiarum characteribus, &c. ornata. 

 Auctore A. Schnizlein, Dr.Ph 392, 393 



Proceedings of the Royal Society ; Zoological Society ; Botanical 



Society of Edinburgh; Geological Society 393 — 428 



Observations on the Generation of the Arachnida, by E. Blanchard; 

 On the Brain of the Dytici in its relations to Locomotion, by E. 

 Faivre ; On SpiochcBtopterus, a new genus of Annelides from the 

 coast of Norway, by M. Sars; On the Sea Saw-dust of the 

 Pacific, by John Denis Macdonald ; Obituary Notice — Dr. Robert 

 Ball of Dublin 428—432 



