712 THE TETRAODONTOIDEA GILL. 



1S41). CHELONDON. (J. JMiill. 



This mime has been already considered in ray article ou Chonerhinus 

 aud therefore needs no further discussion here. It is very desirable, 

 however, that a renewed examination of proper material should be 

 undertaken to solve the doubtful questions that still exist. 



184L) AROTHRON. (J. Miiller. 



In 1839 Johannes Miiller, in his "Vergleichende Anatomic der 



Myxinoiden," (published in 1841,*) gave new generic nnmes to several 



types of Tetraodontids, Physogaster, Ghelonodon, Gheilichthys, aud 



Arothron, presenting the following diagnosis of the last: 



Nocli aiidere, wie Tetrodon iestudinarius f baben statt der Nasea jedereeits ganz 

 solide Teutakelu, iu welcbe der starke Gerucbsiierve gebt. Diese babeu aucb eiuen 

 Eingmuskel um das Auge und eine Art Aiigeiilieder, die Untergattnng Arothron. 



Coordinate with the ring muscle is the deflection of the postfrontals, 

 and especially the i^refrontals, to describe the segment of a circle. 

 In 1855 a diagnosis of a genus was published in the following terms : 



2° G. Dilohomyctere, Bib. (Si^, deux, /lo/iof lobe, /ivKTi/p, iiariue). "Tete courte. 

 Narines se preseutaut sous la forme d'liu double tentacule aplati. — Des ^piues an 

 ventre et sur di verses autres parties du corps. Nageoiresimpaires arrondies; ^piptfere 

 et bypoptere courtes. 



To this genus were referred eleven species, (1) T. reticularis Schu., 

 (2) T. hispidtis Bloch (including six varieties), (3) T. maculatns Lac. 

 (including four varieties), (4) T. meleagris Lac., (5) T. tiigropunctatus 

 Schn., (6) T.majjpaliess., (7) T. diadematus Riipp., (8) T. longicauda Bib. 

 (named T, manillensis Marion de Proce and T. strigosus, Benn.), (9) T. 

 sordidus Eiipp., (10) T. immaculatus Lac, and (11) T. Buppellii (=T. 

 Honkenii Riipp., not Bloch). 



This genus has been confounded by Jordan and Edwards, as well as 

 others with Tetraodon^hnt it differs decidedly in osteological characters, 

 aud has been associated with the Bibronian genera Aphanacanthus, 

 Amhlyrhynchotus, iStenometopufi, Oeneion, Epipedorhynchus, and Prome- 

 cocephalus in a comprehensive group, to which a new generic name, 

 Apsicephalus, was given by Hollard, while the typical Tetraodon was 

 united with Dichotomycter in another supergeneric group called 

 Brachycephalus by Hollard. 



Arothron, being the prior name and based on the typical species of 

 Dilohofnycter, should be adopted. 



1854.) CHONERHINUS. (Bleeker. 



The facts respecting this genus have already been detailed in a 

 previous article on the genus and therefore need not be repeated here. 



* Abhandl. Berlin Akad., 1839, p. 252, 1841. 



t Tetrodon testudiiiorius (see Arcbiv fiir Naturg., 1). Jahrg., p. 330, 1843) is the 

 Tetrodon reticularis Schn. (See Gthr. Cat. fishes, v, 8, p. 29G.) 



