TUNICATA. 7 



united by a root-like base. Ex. Clavellina lepadi- 

 formisj Plate I. fig. 4. 



3. AsciDiAD^. Each animal complete in itself and inde- 



pendent. Ex. Ascidia mentula, Plate I. fig. 5. 



4. PELONAiADiE. Each animal independent and unat- 



tached ; apertures on the same level ; Kving in mud. 

 Ex. Pelonaia corrugata, PI. 1. fig. 1. 



5. Salpid^. Solitary and aggregate in alternate genera- 



tions. 

 I cannot leave this very slight notice of the Tunicata 

 without a passing tribute to the memory of one who spent 

 a great part of his life in searching into their nature. M. 

 Jules Cesar Savigny, taking the word "Patientia^^ for his 

 motto, followed up the minute history of these little masses 

 of jelly, bags of leather, and conglomerations of living stars, 

 day by day, year by year, with the dredge, the forceps, the 

 eye, and the lens, till the continued strain upon the eye at 

 last deprived him of sight, and shut out the whole world of 

 wonders from his view. 



