12 



C. F. ROUSSELET ON ASPLANCHNA INTERMEDIA. 



and cloaca. These jaws are very peculiar and most instructive, 

 -as they are of the same type as those of Asplanchiui, with the 

 addition of a complete malleus. It will be readily seen that the 

 structures called secondary or reserve jaws in Asplaoichna are 

 really the remnants of the mallei. Binojjs lonyij^es is the same 

 animal as the one Mr. Gosse called Asplanchna eupoda (Supple- 

 ment, PI. XXXI., Fig 3), for in his original sketch-book, now 

 ■deposited in the Library of the Royal Microscopical Society, 

 there is a sketch of the characteristic jaws, which has not been 

 reproduced in the published figure. Owing to the foot and the 

 presence of an intestine it was removed to a new genus by Mr. G. 

 Western, but its true name, according to the laws of precedence, 

 should be Dinop)s eupoda. A figure and description of this animal 

 will be found in Mr. Western's paper in this Journal for 

 January 1891, p. 257. Measurements: — 



Asplanchna hrightwelli 





5> 



?> 



Another smaller specimen 



?j 



11 



11 



11 



Asjylanchna amphora 



11 



11 



A splanchna intermedia 



(from Hertford Heath) 



5J 



A. intermedia 



Another much larger specimen 

 (from Germany) . 



>i 



11 



11 



11 



ii 



Description of Plate I. 



Asplanchna amplwra, J', x 85 (drawn by Mr. Dixon-Nuttall). 

 ,, intermedia, ^, x 100 (drawn by Mr. Dixon-Nuttall). 

 ., hrightwelli, jawp, x 375 

 „ ,, jaws, side view, x 375 



,, „ side view of tip of ramus, x 1050 



„ avqyhora, jaws, x 400 



intermedia, jaws, x , 275 

 6a. JDinops et/poda {lo?i{fipes), jaws, x 900 

 6h. ,, .. .. side view of manubrium, x 900 



Jouni. Quekett Microscopical Club, Ser. 2, Vol. VIII., No. 48, April 1901. 



