182 APPLICATION OF THE NAME TEUTHIS—GILL. vol. xvm. 



Secondly, in the suoeeeding'Taun.t! Orientalis Conspectus " prefatory 

 to the " Descriptiones Aninialiam'' ' the following names are to be found : 



Scarus : novum genus. 'Lmpoi^. 



9 («) rhniUdns: Djezavi ycX SUjdn. [Arabic letters.] Nov. jrenu.s: Siyanus. 



10 (b) stellatus. Gbiejehiin. [Arabic letters.] 



No corresponding mention of the name Acanthnn(.s occurs under 

 Chrvtodon.'^ 



Tliirdly, on referring to the text (page 25) these species are mentioned 



in the following terms: 



Scanis novnui genus antiquo nomine S/cdpor. Character genericns: Dentium loco 

 maxillie ipsie eminentes, margine deutato-crenatio, ossca'. 



9. Scarus siganus; rivnlatus; maxillis continuis, coiiiplauatis, margine serrato- 

 denticulatis : denticulis approximatis, tiliformibus; a medio labio paulatim decre- 

 scentibiis. 



[A detailed descriiition of the species follows.] 



Obs. Videtur genus proprium una cum sequente constituere; quum Jiabitus prorsus 

 ]troprius. Nomen Siyani de.sumtum ex Arab. Sidjan vel Sigian. 



10. 8carns stellatus ; ovalis fasciis anuulis ca»ruleo-pallidis, subhexagoni.s, uudi- 

 que contignis. 



The name Siganus was thus (1) formally proposed as that of a new 

 genus or ''novum genus"; (2) the diagnosis of the "/S'carw.s' sU/anus^^ 

 was related intentionally to thegeneric characters, as will he j)erceived 

 by a comparison of it with that of the succeeding, and (3) the group was 

 recognized as a natural genus on account of the peculiar habit or 

 appearance of the two species for which it was jiroposed. 



The "new genus" was (piite properly adopted by Cuvier, for a time 

 at least. 



In connection with Chfcfodon,^' a i)roposition was made to distribute 

 the S])ecies of the Linnsean genus among three subdivisions, as follows: 



Genus Loc subdivisioncm admittit: (a) Chwtodon: dentibus filiformibus, brevibus, 

 numerosis, multoruui ordinum, densis, acutis, iuferioribus seusiui minoribus. P. Br. 

 radiis 6. Spin;c P. A. 3. (&) Ahii-def diif: dentibus maxillaribus unius seriei, iili- 

 formibus, coutigui.s, submobilibus, obtusis, deutibus faucium nullis, annulo subtus 

 circa oculos, P. Br. rad. 5. Spina' P. A. 2. (c) Acantliunin : dentibus unins seriei, 

 rigidis, acutis, contignis, vel simplicibus vel lobatis. Cauda in utroque latere aculeo 

 uno vel pluribus; exserto et rigido; vel iiiobili et recondendo. Diversum prorsus a 

 Clia'todonte genus; aliquande propriam constituens faniiliam. 



This procedure was even less formal than the introduction of the 

 genus Sif/cunis, but, nevertheless, the name uicitnihurus has been very 

 generally accepted as a generic name for the species of the family dis- 

 tinguished by the characters attributed to it. 



It is again to be recalled that the first Linuiean species of Tex this is 

 congeneric with the Araufhnri of Forskal, while the other is congeneric 

 with the two Sigani of the same author. 



' Page X. ^ Pages xii, xiii. ^Page 25. 



