60 ECHINODERMATA 



a mop from the anterior, and, added to this, in a few hours the whole in- 

 testinal aggregate, gradually discharged, lay free on the bottom of the 

 vessel. Here the tentacula and antennulas, much contracted as usual 

 on separation from the body, continued some time imperfectly exer- 

 cising their ordinaiy functions. 



Meanwhile, the shaggy sac or integumentary body itself, de- 

 prived of all this important organization, remained adhering to the 

 glass as before privation, but, for a day, comparatively quite flattened. 

 However, adhesion was firm ; and the partial recovery of its pristine 

 rotundity and natural figure, with the lapse of two more days, showed 

 that turgescence did not depend on the absorption of water, to be ef- 

 fected by means of the lost organs. 



No external indications of reproduction were betrayed for seven 

 weeks ; nor, by illuminating the sac as much as practicable in such an 

 opaque substance, could any renovated interanea be discovered. To ob- 

 viate the injury of augmenting temperature in an apartment, the speci- 

 men was exposed during an hour or two to the cool nocturnal air. 



Owing to my absence, and certain unavoidable circumstances for a 

 month preceding the middle of August, this specimen was entirely ne- 

 glected : it had lost its adhesive quality, was greatly contracted, and 

 rolled as an ovoid below. Replenishment of the vessel revived it in 

 six hours. 



From the end of August it became whiter and whiter, and towards 

 the middle of September, a dark internal substance announced regenera- 

 tion there. 



At last, in four months from the date of mutilation, recovery of 

 the essential organs, whereof the animal was then deprived, now ap- 

 peared, by the display of new tentacula and antennulre, exercising those 

 evolutions peculiar to their nature. 



The length of the cyUnder did not exceed a line in the first week of 

 October, whUe the tentacula and antennulce were scarcely more than 

 visible from extreme transparency. One of the former had acquired 

 twelve twigs on the fifteenth, some of these without subordinate parts. 



