96 



The two anterior bands of cilia have shifted their positions on the 

 ventral side to such an extent that they now lie in interradii of the 

 developing star. In proportion to the size of the star in three and 



five day embryos, the larval 

 '^' organ in the latter is much 



smaller. 



Figure 5 is a sketch of 

 a five day larva, and is about 

 the same stage as the young- 

 est figured by Krohn. 



It will be noted that 

 from the very first appear- 

 ance of any part of the adult 

 structure, it has had a direct 

 and constant relation to the 

 larval body. That pouch of 

 the hydrocoel, which by any 

 method of numbering would 

 be 3, points towards the an- 

 terior end of the larva and 

 opposite it is the interradius 

 which contains the pore 

 and stone canals. The plane 

 which cuts the larva into 

 two bilaterally symmetrical 

 halves, also divides the developing star symmetrically, that is, in 

 the axis of its radial symmetry. We have in the live history of O. 

 olivaeea, a complete verification of the conclusion arrived at by Goto 

 in his study of the relation of the adult form to the larva in Asterias 

 pallida. Here, however, there is nothing to obscure the relations re- 

 ferred to while in A. pallida^ there are several factors which so com- 

 plicate the question as to allow of other conclusions than the one ar- 

 rived at by Goto, viz: in A. pallida the rotation of the oral and aboral 

 disks brings into the same radius arm III and radial water tube 2. 

 Baltimore Md., 24./12. 1898. 



III. Personal -Notizen. 



Necrolog. 



Am 18. Januar starb in Wien Dr. Karl Friedr. Wilh. Claus, Professor 

 der Zoologie emer. der dortigen Universität. Am 2. Januar 1835 in Kassel 

 geboren, studierte er in Göttingen und Gießen, wurde Professor in Göttingen 

 und Marburg und später nach Wien berufen. 



Druck von Breitkopf & Härtel in Leipzig. 



