The Morphology of Cosmobia 435 



In the present case the first of the two diagrams in Fig. 33, which 

 represents the actual conditions of the two inner eyes of Teras I, with 

 their muscles, gives us the two pictures to be superimposed, and the 

 second the result of an approximation equal to that shown by the monster 

 in question. Here, however, aside from simple superposition one must 

 consider an hypothetical force which tends to push to one side, either 

 dorsally or ventrally, parts that come in so close contact that they en- 

 danger each other's existence. 



Thus the two muscles in the first diagram which would suffer the first 

 and the most by a gradual approximation of the two eyeballs are the 

 external recti and the retractores bulbi; of these, the first, which lies a 

 little above the other, would be the one pushed out from the region of 

 contact, while the two components of the other pair would simply fuse. 

 Above the two external recti the two superior obliques would come 

 together by their insertions, which run directly across the eyeballs and 

 point outwards, in this case towards one another, and the resulting organ 

 would be a transverse band with a tendon in the middle and a muscular 

 belly at either end. This band would lie in contact with the surface 

 of the eyeball but would at no point be inserted into it. Still above 

 this would be found the two superior recti, closely approximated. 



Upon the ventral side of the united retractores we would expect to 

 find the two inferior obliques, united at their insertion and separating 

 the two inferior recti. The two former might, in accordance with the 

 degree of approximation of the two eyeballs, either unite to form a 

 transverse median tendon, as in the case of the obliquus superior, or 

 might find themselves, as represented here, running into a groove between 

 the two eyeball components. The two internal recti would occupy the 

 side of the eyeballs farthest removed from the region of approximation 

 and would consequently remain in their normal position upon the 

 anatomical inner sides of the two components. 



Thus far the second diagram of Fig. 32 has been treated as though 

 it were a purely hypothetical diagram, constructed, as suggested above, 

 for the purpose of furnishing a key to the interpretation of the actual 

 conditions, but it is at the same time much more than this, for it 

 actually represents, not merely a possible stage in a cosmobiotic series, 

 but the real relationships found in the monster in question (Teras XII). 

 These conditions are shown in Plate IV, Figs. 9-12, drawn directly from 

 the dissections before any attempts at interpretation were made. 



In one point, however, the reasoning is not complete, and that is in 

 reference to certain extra muscular slips found in Teras XII, for which 



