( m ) 



Trekt men hiervan af volgens (5) 













= 



1 d*V 



1 dF, 



-v a - 



e -?i 





4 db* 



46 db 



46 ' 



d 



\n komt 









1 



u = 



Ih. 







2 







Met beh 



lip 



van 



de 



verg. (8) 



vindt 



men nu 



terstond 





v>- 



1 



~~2 



u x 



= 1 



:»ti) 



g-24 









v,~ 



1 



2 



u t 



= 1 



^36 2 

 (- '26 



■ 



,—24 







r,- 



1 



'Y 



u. 



= 1 



26 3 -f 56 2 



+ G6 -f 3) e-24 





(9) 



F 4 £7 4 = f — 6 4 + 106' 4-216" -|- 256 4- 12 j 



waarin men gemakkelijk de volgende wet ontdekt 



e~ u . ..(10) 



V n -~ Un = ~ 



(m+1)/ 1/(m+2)/ 2/(h+3)/ 



n! 3/^-1)/ 5/(n-2)/ 



Uit vergelijking (8) en deze blijkt dat F,.-fi C7,i+i dezelfde 



wet volgt, dus is de betrekking (10) juist. 



Dierkunde. — De Heer Wkber biedt eene mededeeling aan van 

 den Heer Sydney J. Hickson, Professor of Zoology in the 

 Victoria University of Manchester. „On a new species of 

 Corallium from Timor. 



(Mede aangeboden door den Heer G. C. J. Vosmaer). 



The species of corals included in the family Coralliidae have been 

 arranged by s_) stematists in the four genera, Corallium, Pleurocoral- 

 lium, Hemicorallium and Plein •oeoralloides. 



The genus Hemicorallium of Gray was merged with Pleuroeorallium 

 by Ridley in 1882 and quite recently Kishinoüye lias called attention 

 to the diffieulty there is in maintaining the distinction between Pleu- 

 roeorallium and Corallium. 



One of the prineipal characters of Pleuroeorallium is the presence 

 in the coenenchym of peculiar twinned spicules which Ridley calls 

 "opera-glass" shaped spicules. These "opera-glass" shaped spicules 

 are not supposed to occur in the genus Corallium. Whether future 

 investigations will support the view of Kishinoüye or not is a 



