132 



DESCRIPTION OF PLATE X. 



DEVELOPMENT OF THE OVA OF THE 

 STEPHANOCEROS, 



( PAGE 67. ) 



Two indivividuals of the S. Ehrenberyi, shewing the development of 

 the ova. 



FIG. 1. In this example an egg, (e), is seen in an advanced stage of de- 

 velopment. The same ovum, two hours later, is shewn in 

 pi. xi, fig. 4, e; p. 68. 



FIG. 2. Two eggs, (e, e}, almost arrived at maturity, were observed in the 

 Stephanoceros here figured. The lowermost one, (e*), was 

 watched till it burst, and the young animal escaped into the 

 parent sheath. It is shewn at h, making its way towards 

 the bottom , from which it ultimately escaped; p. 68, 



