OF ASPLANCHNA INTERMEDIA. 11 



A. brightwelli has jaws without inner tooth or outer basal 



hook, as represented in Fig. 3. The female is saccate, 



humpless, and has about ten flame-cells on each side of 



the lateral canals, attached to a nearly straight band ; 



the male also is saccate without humps. 



A. intermedia has jaws without inner tooth, but with large 



outer basal hook, as represented in Fig. 5. The female is 



saccate, humpless, and has about twenty flame-cells on 



each side of the lateral canals, attached to a nearly straight 



band. The male has two lateral humps, as represented in 



Fig. 2. Both male and female are as a rule smaller than 



the two other species, whilst the jaws are markedly larger. 



A. amphora has jaws with a large inner tooth and outer basal 



hook on each ramus, as represented in Fig. 4. The 



female is saccate, with two lateral humps more or less 



prominent, and has about forty flame-cells on each side 



of the lateral canals attached to a nearly straight band. 



The male has two prominent lateral humps, as represented 



in Fig. 1. Both male and female are as a rule larger 



than the two preceding species. 



I possess preserved and mounted specimens of all these species, 



and also separately mounted slides of the jaws, which have been 



prepared by dissolving out with caustic potash. All these are 



exhibited under microscopes in the room. 



The animal which M. de Guerne has called Asplanchna girodi 

 is certainly A. brigldivelli, and this new species would not have 

 been made if at that time (1888) a correct figure of the jaws of 

 A. hrightioelli had existed. 



In 1891, Dr. E. v. Daday published a Revision of the Species 

 of Asplanchna : it is necessary to say that the figures of the 

 jaw^s he gives, which are copied from different authors, are 

 mostly quite wrong, and therefore misleading. No synonym or 

 identification can be founded on these figures. 



I add some measurements of the female, male, and jaws of 

 these three species ; from these it will be seen that A. intermedia 

 is the smallest species of the three, but has much larger jaws 

 than the other two. A. brightwelli varies a good deal in size 

 in different localities. 



I also add an unpublished figure of the jaws of Dinops 

 longipes, a rare, Asplanchna-like animal with a foot, intestine 



