CIONA. 



of that time lie called his essay a letter, and he addressed 

 it to Linnaeus, but although the work was printed six 

 years before the 12th edition of the ' Sy sterna ' 

 appeared, it is not referred to in that edition, nor is it 

 in Grmeliii's edition of 1791 ; indeed it appears to have 

 been entirely overlooked by all subsequent writers 

 with the exception of Dryander who correctly cata- 

 logued the work. Linnaeus appears to have had a 

 copy, for there is one in his library in the possession 

 of the Linnean Society ; that in the Banksian Library 

 is of course in the British Museum. 



| , li,!!:!-' I 



FIG. 26. Teihyum sociabile Gunner. ('Trondhj. Selsk. Schrift.' Ill, pi. iii, 

 figs. 3 and 4.) In fig. 3 (test), a, threads (of attachment) ; b, c, nipples 

 (worter). In fig. 4 (mantle), a, belly ; b, neck ; c, month ; d, e, nipples 

 or worts on each side of mouth; /, anal tube (" K<pr som gaaer op til 

 anus"). 



This is one of the earliest known Tunicates. It is 

 the Mentula marina of Redi in his ' Osservazione . . . 

 intorno agli Animali Viventi, die si trovano negli 

 Animali Viventi,' p. 183, pi. xxi, f. 6 (Firenze, 1684), 

 and it is almost certainly also Rondelet's " other 

 species " of Mentula marina in his ' Universse aqua- 

 tilium Historian pars altera, cum veris ipsorum Imagi- 

 nibus,' p. 129, fig. (Lugduni, 1555). 



With regard to the other British species of Ciona 

 which are described in the present work, it has been 

 stated above that one, C. fascicularis Hanc., closely 



