The Morphology of Cosmobia 



381 



existence of tciulons^ processes, and other features, each occurring so far 

 as possible in the normal position, and showing always a complete 

 bilateral symmetry, we may feel sure that tlie soft parts were as regular 

 and symmetrical as are the osseous features. 



In the synotic malleus [Fig. 7] there is present upon either side the 

 tendon of M. tensor tympani, also a median processus anterior [Folii]. 

 This latter is well developed and suggests the presence in the earlier 

 embryo of a median rudiment of Meckel's cartilage, the equivalent of both 

 halves of the mandible. The double capitulum is small and narrow 

 in proportion to that of the normal one of a single side, but it is per- 



Right of A. 



Right of B. 



Left of A. 



Crus longum ( (^ Proc. 



lentiformis 



Left of A Right of B. 



Right of A. 



b 



Crus longum 



Proc. lentiformis 



Fig. s. Baluwiis^ Synote, Teras III. 



(a) Double incus; external aspect. The normal incus, taken from the right 

 ear of the perfect face (=A, r.), is placed beside it for comparison. 



(b) The same ossicles; internal aspect. 

 Both bones are drawn to the same scale. 



fectly symmetrical and obviously similar to more familiar reduced median 

 parts that occur in Cyclops and Siren monsters. The conspicuous fora- 

 men in the median line appears to correspond to nothing in the normal 

 malleus, but is suggestive of the double nature of the piece, and reminds 

 one of the old explanation of a "fusion" of two originally separate com- 

 ponents, a theory which has in its favor only such appearances and which 

 is entirely inadequate to explain the phenomena. 



Like the malleus, the double incus [Fig. 8] exhibits upon either side 

 the features characteristic of the normal bone, save that the processus 

 lentiformis appears to be present upon one side only. This part is. how- 



