^4 



Aperta. Lobaria quadiilobata. Mull. Zool. Dan. iii. t. 100. (animai^ 

 p. p. £08. Id. Prodr. No. 2741. 



583 Gmcl. Syst. p. S'iAS.—Turt. iv. p. 113. 



Bulla aperta. Lin. Trans, viii. p. 121. 



The animal to which this fliell belongs confiitutes a diflini^l 

 genus in the Mollufca clafs of the Midlerian arrangement, 

 and ftands fingly between the genera Afcidia and Clio ; but 

 tbis author in his Zoologia Danica remarks, that the fliell 

 taken from the animal is like the Linnaan Bulla aperta. 

 The Gmelinean fyftem takes in the Lobaria between Holo- 

 thuria and Triton, where the fpecific title qiiadrilobata ftands 

 folitary in the genus, without the leafl intimation of its being 

 the animal of Bulla aperta. Thus the pages of Natural 

 Hiftory frequently become tortured, and perplexing, by one 

 part of an animal being defcribed in the clafs of Vermes Tef- 

 tacea, and another part in Mollufca as diftinft. Ascanius 

 calls the animal Philine quadriparlita. 



Htdatis. ^"^' ^''^"*- viii. p. 123. 



p. p. 217. 



5g4 An opportunity of examining the living animal belonging 



to this fhell of a very fuperior fize, enables us to correal: a 



miftake in our former account, and to throw more light 



upon the fubjec^t. 



The animal, when extended and in motion ( which is 

 fimilar to that of a Limar ) is nearly as long again as the 

 Ihell ; the colour is a mixture of purpliiTi-brown, cinereous, 



and 



