IV CONTENTS. 



PAGES 



III. P. CALVIN MENSCH. 



On the Variation in tJie Position of the 



Stolon in Autolytus 89-93 



IV. THOS. H. MONTGOMERY, JR. 



Gordiacea from the Cope Collection .... 95-98 y 



V. GUSTAV P^ISEN, PH.D. 



A Preliminary Account of the Spermato- 

 genesis of Batrachoseps Attenuatus, Poly- 

 morphous Spermatogonia, Auxocytes, and 

 Spermatocytes 99 113 



No. 3. May, 1900. 



I. S. J. HOLMES. 



The Early Cleavage and Formation of the 

 Mesoderm of Serpulorbis Sqnamigcrns 

 Carpenter 115-121 



II. AXEL LEONARD MELANDER AND CHARLES 



THOMAS BRUES. 

 Neiv Species of Hygroceleuthus and Doli- 



chopus, with Remarks on Hygroceleuthus . 123-148 



III. SHINKISHI RATAL 



On the Origin of the Sperm-Blastophore of 



some Aquatic Oligochacta 149-154 



IV. CHARLES THOMAS BRUES. 



Peculiar TracJieal Dilatations in Bittaco- 



morpha Clavipes Fabr 155-160 



V. ALBERT M. REESE. 



Lampreys iri Captivity 161-162 



