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CONTENTS OF VOL. V. 



No. i. — June, 1891. 



pages 



I. W. B. Scott. 



On the Osteology of Pcebrotherium : a Con- 



tribation to the Phytogeny of the Tylopoda, 1-78 



II. Julia B. Platt. 



A Contribution to the Morphology of the 

 Vertebrate Head, based on a Study of 

 Acanthias Vulgaris 79-112 



III. E. A. Andrews. 

 Reproductive Orgajis of Diopatra . . . . 1 13-124 



IV. J. Playfair McMurrich. 

 Contributions on the Morphology of the 



Actinozoa. III. The Phytogeny of the 

 Actinozoa 125-164 



V. F. Mall. 



Development of the Lesser Peritoneal Cav- 

 ity in Birds and Mammals 165-179 



No. 2. — September, 1891. 



I. Samuel Fessenden Clarke. 

 The Habits and Embryology of the Amer- 

 ican Alligator 18 1-2 14 



II. Hermon Carey Bumpus. 



The Embryology of the American Lobster . 215-262 



