Vlll CONTENTS. 



Page 



LXII. On Hyalonema lusitanicum, and on the Animal or Vegetable 

 Nature of Sponges. By Professor Ehrenberg 419 



LXIIL Remarks on the River-Fishes of Chili. By Dr. R. Phi- 

 Lippi, Director of the Museum of Nat. Hist, at Santiago in Chili ... 427 



LXIV. Description of a new Species of Rissoa from Madeira. By 

 J. GwYN Jeffreys, F.R.S 435 



The Theory of the Vertebrate Skeleton, by Herbert Spencer ; On the 

 Type of a new Family of the Order Rodentia, by A. Milne- 

 Edwards ; On the Spontaneous Movements of Colocasia esculenta, 

 by H. Lecoq ; Characters of new Fishes, by Dr. F. Steindachner ; 

 On some points in the Anatomy of the SipuncuH, by S, Jourdain 



436—443 



Index 444 



PLATES IN VOL. XIX. 



Plate I. Organs of Circulation in Helix pomatia. 



II. Anadebis Himachala. — Debis Diana. — Mycalesis Gamaliba.- 

 Orinoma. 



yy' ^New Genera and Species of Satyride Lepidoptera. 



V 1 



Tj* >Ybung Stages of some Annelids. 



VI 



VIT 1 

 Yjjj' [-Excavating Sponges. 



IX. Mesoprion Mitchelli. 



X. Falces and Maxillae of Spiders.— Helicina lamellosa. — Stylo- 

 spores of Sphaeriae. 



XI. Dentition of the Common Mole. 



XII. Anatomy of Pelonaia corrugata. 



