312 GASTEIIOPODES. 



panion in the same vessel, from the bristling up of the branchiae, and biting 

 each other as they met, led to conjecture that it was from violence. On 

 the 1st of October a papilla, rather cylindrical than conical, indicated 

 renovation of the tentaculum : and a low prominence denoted the origi- 

 nating corniculum. Both the organs had regained half their natural 

 dimensions on the 31st, and were tipped with white. 



Some of the other specimens also suffered mutilations of the tenta- 

 cula, and conical papillte subsequently arose from the stumps. But the 

 preceding animal suffered most, for, besides complete privation of a ten- 

 taculum and corniculum, it lost a fragment of the posterior extremity of 

 the body on the 9th of September, which remained still indented, instead 

 of being pointed, on the 23d. None of the whole specimens survived 

 long enough to admit redintegration of the defective parts. 



The exhaustion concomitant on the profuse spawning of the prolific 

 specimen above described enfeebled it so much, that, rejecting sustenance, 

 and losing the adhesive faculty, it died, having shrunk to a third of its 

 original dimensions. 



The survivance of no specimen exceeded eleven or twelve weeks. 



This animal is rare ; but about fourteen years after the preceding 

 colony was taken, a small specimen, not extending above three lines, oc- 

 curred, which reposed constantly supine in quiescence under the surface 

 of the water. Its survivance was short. 



After the lapse of other fourteen years, one occurred of larger 

 dimensions, being about equal to the size of the largest of the former 

 colony. The general disposition of all these animals was in correspon- 

 dence. 



PLATE XLV. 



FIG. 4. Eolis hystrix. 



5. The same, slightly enlarged. 



6. Spawn. 



12. EOLIS PURPUREA The Purple Eolis. Plate XLV. Figs. 19, 20. 



Hitherto our attention has, with few exceptions, been directed to 

 those species of the Eolis having the anterior of the shoulder or sole 



