A MEMOIR ON THE GENUS SALPA. 



By W. K. BROOKS, 



Professor of Zoology in the Johns Hojjkins University. 



The Johns Hopkins Press announces for early publication a 

 Memoir on the Genus Salpa by Professor W. K. Brooks. It will 

 contain about three hundred and fifty pages quarto, with sixty 

 colored plates. The memoir is based for the most part upon 

 material collected by the United States Fish Commission. 



TABLE OF^ CONTENTS. 



Part I. — A General Account of the Life History of Salpa. — Chapter I. Intro- 

 ductory. Chapter II. The Development of the Solitary Salpa from the 

 Egg. Chapter III. The Morphological Significance of the Salpa Embryo. 

 Chapter IV. The Origin of the Proliferous Stolon. Chapter V. The Trans- 

 formation of the Stolon into the Series of Aggregated Salpae. 



Part II. — The Systematic Affinity of Salpa in its relation to the Conditions 

 of Primitive Pelagic Life; The Phylogeny of the Tunicata; and the 

 Ancestry of the Chordata. — Chapter VI. The Systematic Position of Salpa. 

 Chapter VII. Salpa in its Eelation to the Evolution of Life. Chapter 

 VIII. The Origin of the Chordata, considered in its Eelation to Pelagic 

 Influences. 



Part III. — A Descriptive and Critical Discussion of the Asexual and Sexual 

 Development of Salpa. — Chapter IX. The Origin and Maturation of the 

 Egg of Salpa. Chapter X. Sex in Salpa. Chapter XL Fertilization 

 and Segmentation. Chapter XII. The Foetal Membranes. Chapter XIII. 

 The Follicle. Chapter XIV. The Ontogeny of the Organs of Salpa. 



Part IV.— By M. M. Metcalf. The Eye and Sub-neural Gland of Salpa. 



Advance orders will now be received. The edition will be limited. 

 The price is fixed at $7.50 net. 



