308 NEW YORK STATE MUSEUM 
tains the neanic position of the eyes and the round anterior angles and 
stands in the proportion of length to width between the neanic and nepionic 
stages aS 10 ! 15. 
The submarginal position of the compound eyes in the neanic stage 
is a feature inherited from the preceding stage and corresponding to the 
appearance of these eyes in the larva of Limulus at the line of insertion 
of the rimlike edge of the lateral lobes [text fig. 24]. A peculiar difference, 
apparently at variance with the enormously enlarged eyes in the larval 
condition between the neanic and ephebic stages consists in the re- 
latively smaller size of the visual surface and inclosed node in the for- 
mer [c7. fig. 9, 11 with pl. 52, fig. 2, 3]'. But if, as we have inferred before, 
the final visual node and visual surface in the nepionic stage are repre- 
sented by the central or apical node borne on the large larval visual 
node, then the small size of the eye in the neanic stage is the direct result 
of the nepionic condition. We have then the peculiar fact, that in the 
ontogeny of S. myops the actual visual surface of the eye increases 
relatively with advancing age, while the visual node on which it is borne, 
greatly decreases. | 
The ocelli have not been located in the nepionic stage, but their po- 
sition midway between the lateral eyes in the neanic stage can be clearly 
made out. 
1 In former [fig. 9] to length of carapace as 10 : 37; in latter [fig. 2] as 10: 27. 
