CONTENTS. 



I. — Observations on the Nature of Capillaries, and on the Mode of Arrange- 

 ment of those in the Gills of Fishes. By John Quekett, Esq., Assistant 

 Conservator of the Museum, and Demonstrator of Histology at the Royal 

 College of Surgeons of England. - - - - -I 



II. — Observations on the Vascularity of the Capsule of the Crystalline Lens, es- 

 pecially that of certain Reptilia. By John Quekett, Esq., Assistant 

 Conservator of the Museum, and Demonstrator of Minute Anatomy at 

 the Royal College of Surgeons of England. 9 



III. — Observations on some part of the Anatomy of two Species of Naked-eyed 



Medusa?. By George Busk, Esq., F.L.S., &c. - - - 14 



IV. — Observations on certain points in the Anatomy of a Species of Thauman- 



tias. By George Busk, Esq., F.L.S., &c. - - - -22 



V. — The " Disk-cutter," a new Instrument for cutting circular Disks of thin 

 Glass for mounting Microscopical Objects. Also, the Description of a 

 Collecting Stick for procuring Infusoria, &c. By George Shadbolt, 

 jun., Esq. -_.--_. - 32 



VI. — On the Markings on the Scales of Amathusia Horsfieldii. By Warren 



De la Rue, Esq., F.R.S. - - - - - - 36 



VII. — A Description of a new Form of Hair from a Species of Tarantula. By 



George Shadbolt, Esq. - - - - - - 41 



VIII. — On a peculiar Form of Elastic Tissue found in the Ligamentum Nucha? 

 of the Giraffe. By John Quekett, Esq., Assistant Conservator of the 

 Museum, and Demonstrator of Histology at the Royal College of Sur- 

 geons of Euglanrl. - - • - - - - 45 



IX. — On the Structure of the Siliceous Lories of the Genus Arachnoidiscus. 



By George Shadbolt, Esq. - - - - - - 49 



X. — Microscopical Observations on a Malady affecting the Common House-fly. 



By Cornelius Varley, Esq. - - - - -55 



XI. — On the Architectural Instincts of Melicerta ringens, an Animal of the 



Class Rotifera. By P. H. Gosse, Esq. - - - - 58 



XII. — An Account of the Dissection of a Human Embryo, of about the Fourth 

 Week of Gestation ; with some Observations on the Early Development 

 of the Human Heart. By Arthur Farre, M.D., F.R.S., Professor of 

 Midwifery in King's College, &c. - - - - - 65 



