ON KLKGINUS OK KISCHKR, OTHERWISK CALLKD TILESIA OR 



PLEUROGADUS. 



i;y 

 Thkooork Gill, M. I>. I'm. D. 



All Ari'tii; type )f tlu' r.iiiiily of (ijitluls, to which tlic s|)i'cilic nami-s 

 (laitus )tnr(i(fa, (f. fparilis, ami (t. >r<trhnn havt* Iummj j;iviMi, is «listiii 

 ;,MiishtMl l>y lu'aiii like iiar.i|>t)|thys('.s of thr alMlomiiial vertebra* chan- 

 iirltd l)»'h»\v. Tills petMiliarity, it was supposed, lia<l l»('(>n first ma«le 

 kiiiiuii li\ Dt. r.( III. i'.y AiiHMieat) aiiuiors the name TUcgia (of Swain- 

 son) or snhseqneiitly I'lemofjaihtH (j^iven l»y Hean because Tihitia was 

 ]ireoccii)»ic(l) has l)cen used as a snl);;eneii(' or <;cm'ric name. No one 

 siippostil tliat a previous name couhl ha\e been };iven; but in looking 

 thiou;,'h \»)himcs of the '•M«'moires de hi Socicte Impi riale des Natura- 

 listes de Moscoii,*^ re<'ently obtained to till j^aps in the series in the 

 Iibiai.s of the Smithsonian Institution. 1 came across a memoir lueviously 

 . iitirely unknown to me as well as to others. The nu-moir is entitle<l 



• l{ccher<'hes zoologiques par (J. I'ischer," and is in the fourth volume 

 (lM id., pp. Ii37-J7r)). The volume was ori;rinally pulilishcd in 1.S12 

 and isl.l, but a second edition was issued in IS.'^O ( isiJ-lsi.t. Ri'im 

 |trimfscn ls;{()). Tlu* Researches comprisctl four chapti'rs, viz : ''I. Sur 

 le8ynidu('auease"(p.l.'40); "11. Siir le.Ieltopusick" (p. 241 ); "ill. Sur 

 le Navafia" (p. 2">L'); *'I\'. Notices sur I'anatomie <les poissons: A. Siir 

 r.iuie des poissorjs'' (p. 205) and " 11. Sur une articidation projjre anx 

 poissons; articulation annulaire'' (p. 272). The memoir was illustrated 

 by ci;,'ht plates (pi. 2-9), on four of which (pi. Ti-S) were delineateil struc- 

 tural details of the Nava;;a as well as a ;;ood li;;ure of the entire fish, the 

 best indeed that has been publisheii. 



Dr. I'iseher. in the chapter on the Navapa (III. Sur le Navapa), ties 

 ij;nat«'d that fish as the ^^ FJIeffinus nnrugn, Fischer. — (imius naragay 

 Pallas. " lb rt'calh'd that Pallas had recopni/«'«l it as a distinct 8|»ecie8 

 but that Tilesius re;:arded it as a mere variety of the common ("od 



Goiius crtllarinn). \\>\ however, not only consiilered it to be spe- 

 < itically tlistinct, but even generically ditVerent from Oatlm* After 



* .Ii' tActnTiii ill' ()<(iii<>ntr«>r i|ii<> If Nnvafja cut iinn sciilptnont iino cfi|idrc distincte, 

 ce i|iio I'.iilim u (li^j.i pro iv6, maiii iprd «lift'45n* lucnic g<^iidriquemcut du genn' Ga- 

 ifn« |"i«, »i..r, 0. c., J». *.i.'»4. 



PriMii-iliin.'* N.ilioii il Murium Vul XIV Vn Ril 



.103 



