EMBRYOLOGY OF CRYPTOBRANCHUS ALLEGHENIENSIS. 147 



envelope, the secretion of the oviduct. This outer egg envelope 

 is produced at opposite poles of the capsule to form a slender 

 cord connecting the eggs in a string (Fig. i). The envelope is 



up 



lam. z. 



FIG. i. Eggs and egg envelopes of Cryptobranchus, natural size, op.b., opaque 

 body ; lam.z., lamellar zone of envelope. 



FIG. 2. Optical section (longitudinal ) through lamellar zone of envelope in region 

 of junction of egg capsule with connecting cord. Magnified about thirteen diameters. 



FIG. 3. Spermatozoon, magnified about five hundred diameters, w., middle 

 piece. 



perfectly transparent when fresh, except that wherever viewed 

 tangentially its inner layers have a milky appearance, repre- 

 sented by the shaded zone in Fig. i, and due to a fine lamellar 

 structure sketched in optical section, with a magnification of 

 about thirteen diameters, in Fig. 2. The misty appearance is 



