MUSEUM OF COMPARATIVE ZOOLOGY. 35 



ber of . soundings made. The Monaco trap proved successful 

 down to 450 fathoms, the greatest depth at which it was tested, 

 and it brought back numerous fishes on each occasion that it was 

 set. Considerable collections of the surface fauna were made, 

 Salpa and Doliolum, in particular, being remarkably abundant, 

 but very few species from intermediate depths were taken. Espe- 

 cially noteworthy among the collections are a series of excellent 

 specimens of a Medusa belonging to the Bythotiaridae, a family 

 but little known. 



Publications. August 1, 1907-July 31, 1908. 



Studies on the nuclear cycle of Gonionemus murbachii A. G. Mayer. 



Bull M. C. Z., December, 1907, vol. 48; p. 285-399, 8 pis. 

 On hybrids between the mallard (Anas boschas) and certain other 



ducks. Auk, October, 1907, vol. 24, p. 382-388. 



