12 g ZOOPHYTES. 



means of their base, which supplies the place of a foot; one of 

 them, which was left at the bottom of a jar at night had ascended 

 about six inches on the side by the next morning. The only organs 

 which could be discovered apparently connected with the faculty of 

 attaching themselves to objects, were the delicate fibrous penicilla- 

 tions on the extremities of the inner series of tentacula. None of the 

 others appeared to be tubular, yet all of them, more or less, possessed 

 this power. 



" Having a number of Monodontas too much crowded in a large jar 

 of water, I took out half a dozen and placed them in a jar with the 

 Actinia. On looking at them about three hours after, I found that 

 instead of climbing like the others to the top of the water, they re- 

 mained just where they had fallen, closely withdrawn into their shells. 

 Supposing them dead, they were taken out, when they directly began 

 to emerge ; and when returned to the jar with the other Monodontas, 

 they were all, in less than five minutes, clustered around its mouth. 

 On placing them again in the jar with the Actinia, though kept there 

 for two hours, they did not once show themselves out of the shell. 

 Once more placing them along with the other shells, they exhibited 

 their former signs of life and activity. The experiment was repeated 

 several times with a large Littorina with the same results, evincing 

 fear of the Actinia on the part of the molluscs." J. P. COUTHOUY. 



2. ACTINIA PUSTULATA (Couthouy). 



A. extus pustulata, medio cylindrica et 2" crassa, infra supraque valde 

 dilatata (fere 3"), basi angustissime (1-1J'") inciso-lobata, margine 

 superno tuberculata, tuberculis remotis, breviter tentaculiformibus ; 

 tentaculis subcequis, prcelongis (fere 2") et validioribus, subulatis, 

 biseriatis ; ore oblongo (f") valde prominente, intus sex-partito : con- 

 tracta, cylindrico-hemispherica. 



Exterior pustulate, at middle cylindrical and 2 inches broad, upper 

 and lower extremities very much spread (nearly 3 inches in 

 breadth), base at margin inciso-lobate with the lobes very narrow 

 (1 to l lines), upper margin tuberculate, the tubercles remote and 

 like rudimentary tentacles; tentacles nearly equal, quite long (nearly 

 2 inches) and stout subulate, in two series ; mouth oblong (^ of an 



