"""mu^'] PHOCEEUINGS OF THE NATIONAL MUSEUM. 711 



cutcutia, 1111(1 the fremiB was subseciiuMitly well detined from cranial char- 

 acters by Ilollard, as Monotreta. 

 Bibrou diagnosed a genus in the following terms: 



8.0 G. Mo»otreU',\i'\\i. {uoyo?, soul, rpero'i, troiH-, pcrcr^). '•Naiin.-s naviint « lin- 

 ciine qu'uue scale oiiverturo circul;iiroi\ bord noil Miiillant. —Point dVpiiifs hut uu- 

 cuno partie du corps, qui est compl6teiuont iis8e.--NaKfoiirM impain-H arrondicn; 

 epit^ro et bypopt("^rc comtcs." 



Eitpicc hh'kiiw : T. vKtciitUi, Hiiiii. ( lUicliuuan). 



In 1865 Bleeker united Monotreta with Leiodotiy expressing the fol- 

 lowing opinion respecting Ilollard's views : 



11 lit nn aeul genre des Craijrncion et des Leiodon, tout on consurvant le ^onre Mo- 

 notreta Hib. qui cependant no<lift>re pas des Leiodon. 



Bleeker adopted the gi^un^ Leiodon of Swainson rather than Lrisumus 

 or Leiosomns or Liosonuis, for the following reasons: 



Lo noui }jtMHMi(|UP do Xii.v/xhms nu-rittTait done d't-tre consorvi^ 8'il n'avait pas 6U- 

 employe, avant Swaiuson, en 18.J1, pour un genre de Coloopteres. Or, Swain.son dauH 

 son Natural History of Fisbes, etc., employa aiiasi (p. 194), pour indicpier hou )tctirt> 

 Lcisomus, le noui de Leiodon, et c'est par consequent ce uom, qu'il aurait dil <ln reste 

 ^crire Lioduii, qui a le droit <le priorit6 sur celui de Job. Miiller. 



I can not corroborate the statement that Leisomus or Ltiosomus or 

 Liosomus had been eniployed in zoology before its use by Swaiiisorj, 

 although Leisoma and Liosoma had been frequently used. While I 

 for myself should Inive preferred the name Lioftomus, I acknowledge 

 Bleeker's right' to choose one of two names simultaneously given, and 

 consequently accept Leiodon, as that name does not aj)pear to have been 

 previously used, either in tliat form ov under the guise of Liodmx. 



In 1870 Giinther accepted the name, under the niodifii'd form Mono- 

 tretus, for a section of Tt'/ro(/o«, including only the T. riHintin, with 

 the following diagnosis : 



D. A simple circular nasal cavity. Hody sujootb : Monotrttun {\V\\ir.). 



The other species of Leiodon noticed by Bleeker were referred to au 

 other section, viz : 



C. A simple, not perforated nasal cavity witb a fringed edj^e. HoilvHpiny: Che- 

 lonodon (MUl). 



The genus thus ai)pears to liave Itecn l)as('(l on tlc<i(lfil fxtcrnrtl as 

 well as cranial characteristics and is therefore adopted. 



The history of tlie genus is summarized in tlie syuonyim. 



i.KH)i)i>N. 



• 



= Leiodon Swainaon, Nat. Mist. Fisbes. etc., vol. 2, p. IHJ, 1831). 



= Leisonius Siniinson, Nat. Hist. Fisbes, etc., vol. '2, p. .Tis, 1*19. 



= Mouotrite liibron, Rev. et Mag. ZoOl, (2), vol. T, p. 2.S1, lrt5.'i. 



= Monotreta Hollard, Ann. Sc. Nat.. (4), vol. 8. p. 3-22, ia=i7. 



<Leiodon Bleeker, Atlas Idi. Nierland In<l., vol. .'i, p. 4T. l'*«ri. 



= Monotrotus (Hinthrr, Cali. Fisbes. \^. M.,v. b. pji. 272. 'HMK l-7n . S..<-tinii ..l T,t,„don. 



= Liosomns Cill, Proc. U. S. Nat. Mus., vol. 7, p. 422, 18?<4. 



Tetraodon sp., Hamilton et al. 



Leiodon sp., Bleeker (1H<k)). 



