YOUNG OF THE STEPHANOCEROS. 69 



Thirty hours after its liberation from the sheath of the 

 parent, the young Stephanoceros maintained the same 

 general appearance: but it had increased in size, the 

 cilia were larger, and their action more powerful ; and 

 a cluster of four (or five) sub-conical papillae was per- 

 ceptible within the body, (pi. xi, fig. 1, a) ; these were 

 probably the rudimentary rotatory organs. Eighty 

 hours after birth the young creature, when partially 

 contracted, appeared as in pi. xr, fig. 2, The five mam- 

 millated projections fringed with cilia, (four only are 

 shewn in this aspect), on the upper margin, are evi- 

 dently the rudiments of the tentacula. The position of 

 the stomach is indicated by the green colour of the food 

 that has been swallowed. 



The development of this individual was traced no fur- 

 ther ; but in another, observed from its exclusion from 

 the egg to the eighty-fourth hour, the arms were more 

 produced, (pi. xi, fig. 3, a), and the digestive organs 

 very distinct, (pi. xi, fig. 3, b). In this example the 

 young one did not escape from the sheath : the parent 

 died about ten hours after the egg burst, and its body 

 soon decomposed. The young one continued to grow, 

 though inclosed in the sheath, till the eighty-fourth 

 hour, as shewn in pi. xi, fig. 3, when it expired. No 

 traces of a sheath or mantle were observable in any of 

 these specimens, nor was the red eye, described by M. 



