132 



DESCRIPTION OF PLATE X, 



DEVELOPMENT OF THE OVA OF THE 

 STEPHANOCEROS. 



( Page 67. ) 



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

 the ova. 



Fig. 1. In this example an Q^g, (e), is seen in an advanced steige of de-^ 

 velopment. The same ovum, two hours latei*, is shewn in 

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



Fig. 2. Two eggs, (e, e), almost arrived at maturity, wer'e observed in the 

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

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

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

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



