l^o. AS^-V,^-.-] AMERICAN SOCIETY OF ZOOLOGISTS. 



organs are, therefore, concerned with \-ibrati() 

 quency. These vibrations are often prockiccd \vh 

 move in the water or when wind blows on its sui 



The Sexual Elements of the Giant Salain 

 Reese, Syracuse University. — Eggs and spcini 

 tained by stripping giant salamanders {iryptohi 

 iensis) during the latter part of September. 



Each egg is a spherical mass of yellow \(.lk, 

 diameter, surrounded by two layeis of tian.span 

 not completely fill the inner envelope, but is m 

 aqueous fluid. 



The egg proper is filled with yolk giainilcs ( 

 and is surrounded by a thin vitelline membrane. 



The gelatinous envelopes are continued as sk 

 egg to egg, forming a continuous string similar t( 

 of Amphiuma. The distance between two a< 

 about four or five times the diameter of a single 



Some dozens of eggs were obtained from oi 

 them apparently being derived from one ovai>. 



The spermatozoa, in which no motion could 

 stripped with little difficulty from the males, c( 

 gated, cylindrical nucleus, a shaip, giaduill) 

 body, and a tail of moderate len^i^th wnich ion 

 fibre and a transparent envelope. No middlt-pi 



Artificial fertilization was attemptetl but 



Some Recently Discovered Casc^ </ Mutual 

 tion: P. P. Calvert. Unix. ■r.'-it) ol l\:nns>hanK 

 the Odonata ()f Mexico and Central AuKiua 



neura, P. peramans, presented a i^niaikabU. a 

 sexes for mutual grasping during palnn,^. m th 

 rior, terminal, abdominal appendai^c.s ..t the n 

 between bifid, mesothoracic processes ot the tei 



