No. 506] 



NOTES AND LITERATURE 



111 



ture in which the anthoridial filaments arise cndogenously. This 

 conception has strong' support in the abnormal conditions de- 

 scribed by Ernst for Cham syncarpa where antheridial filaments 

 were found developing externally from cells below the oogonium 

 giving an hermaphrodite association of sexual organs. Schcnck 

 considers the Charales to be much more closely related to the 

 brown algae than to the green, basing his views on the above 

 considerations together with certain resemblances between their 

 vegetative structure (characterized by nodal and mternodal 

 regions) and that of certain brown alga 1 . Kpcrmatoelmns. Des- 

 marestia, etc. 



HOLOTHURIANS 

 Clark's The Apodous Holothurians. 1 — Revis 

 larger groups require more painstaking car 

 most other forms of biological study, cert 

 to the contrary, notwithstanding. Dr. Clarl 

 example of a revision applied to a difficult gi 

 is a well-executed and well-matured piece 

 which fulfills all reasonable expectations, 

 important treatise that has ever been publish 

 Molpadiida? and Synaptidae. 



The monograph is based upon a critical e 

 2,200 specimens in the collection of the Na 

 is divided into four parts. The classificatioi 

 is first discussed and a table of accepted 

 species, is given. Part II is an annotated ] 

 the collection of the National Museum, in 



