on the Natural Group of Tunicata. 535 



Neither is it the Ascidia pedunculata of Lamarck, which is the 

 Ascidia clavata of Shaw's Zoological Mkcellaiiy^ the Vorticella 

 Bolteni of Linnaeus in the Mantissa Plantarum, and the Boltenia 

 fusiformis of Savigny. This last animal, however, as Savigny 

 suspected, comes much nearer than the A. globifera of Lamarck 

 to the Ascidia clavata of Otho Fabricius, which, as I before 

 said, is the Ascidia globifera of Captain Sabine, and one of the 

 animals Mr. Griffiths has brought from Winter Island. It thus 

 appears that considerable confusion has arisen in the applica- 

 tion of the trivial names pedunculata, clavata, and globifera ; 

 and I shall therefore offer the following synopsis of the only 

 three species of Boltenia which are yet satisfactorily known to 

 exist, and which are all peculiar to the Arctic seas. 



Spec. 1. Boltenia ovifera. 



B. murina scabra vel potius hirsuta, corpore ovato, orificiis vix 



prominentibus, pedunculo sublaterali. 

 Boltenia ovifera. Sav. Mem. vol. i. p. 140. tab. 1. fg. 1. 

 Ascidia globifera. Lamarck, Anim. sans Vert. vol. iii. p. 127- 

 pedunculata. Shaw, Zool. Miscell. t>ol. vii. tab. 239- 



Brnguieres, Enc. Meth. no. 12. tab. 63. fig. 12, 13. 

 Vorticella ovifera. Linn. Syst. Nat. ed. 13. p. J319- 14. 

 Animal-Planta. Edwards, tab. 356. 

 Priapus pedunculo filiformi corpore ovato Alex. Russel in Phil. 



Trans, vol. Iii. p. 556. tab. xvii. (figuris malis). 

 Animal aquatique. Bigot de Morogues,in Mim. Etrang. de I' Acad. 



des Scien. de Paris, torn. ii. p. 145. cum tabuM pessimA? 



Spec. 2. Boltenia fusiformis. 



B. obscure rufa vix scabra, corpore elongato-ovato, orificiis pro- 

 minentibus, pedunculo terminali. 

 Boltenia fusiformis. Sav. Mem. vol. i. p. 141. 

 Ascidia pedunculata. Lam. Anim. sans Vert. vol. iii. p. 127- 



Ascidia 



