2604 Bulletin ^7, United States National Museum. 



Psettiohtliys molanostictus 11 + 29 = 40 



Paralicbtbys oblongus 11 -j- 30 = 41 



Paraliclitliys deiitatus 10 -|- 30 == 40 



Paraliclithys letbostigimis 10 -f 27 = 37 



Paralichtbys albignttus 10 + 27 = 37 



Paialicbtbys caliiornicus - 10 -f 25 =; 35 



Xystreuiys lii)lepis 12 -f 25 ^^ 37 



Aucyloi^st'tta quadrocellata 9 -}- 26 ;= 35 



II. — rLEUROXECTlN.K. 



Glyptocepbaliis zacbirus 13 + 52 = 65 



Glyiitocepbalus oynoglossus [58] 



IMicrostomus pacificu.s 12 + 40= 52 



Microetomus kitt [13 + 35= 48] 



Paropbiys vetulus 11 + 33= 44 



Pleurouectes platessa [14 + 29 ;= 43] 



Isopsetta isolepis 10 + 32 = 42 



Lepidopsetta biliuea ta 11 + 29 ^ 40 



Limanda liruanda [40] 



Liopsetta glacialis 13 + 27 = 40 



Pleuronicbtbys decnrreiis 14 + 26 = 40 



Pleurouicbtbys verticalis 13 + 25= 38 



Flesus gbiber 11 + 26= 37 



Flcsns fit'sus [12 + 24= 36] 



Pseiidopleurouectes americanns 10 + 26 =^ 36 



Hvpsopsetta giittulata 11 + 24=: 35 



Platicbtbys stellatua 12 + 23= 35 



III. — PSETTIN.E. 



Monolene sessilioauda [43] 



Lepidorbombns wbift'-iagoiiis [11 + 30:= 41] 



Citbnricbtbys sordidus 11 + 29 = 40 



Platopbrys lunatus 9 + 30= 39 



Arnoglossus laterna 10 + 28 = 38 



Aruoglossus grobmauni 10 + 28 := 38 



Zeugopteriis puiictatus [12 + 25 =37] 



Pbitopbiys oceUatus 10 + 27= 37 



Lopbopsetta macubxta 11 + 25= 36 



Botbiis iboiiibus 12 + 24= 36 



Syacium papillosum 11 + 25 = 36 



Citharicbthys aictifrous 10 + 26= 36 



Syacium micrurum 10 + 25 ^ 35 



Pbrynorbombus regius 10 + 25= 35 



Citharicbtbys spik)pterus 10 + 24 =: 34 



Citbaricbtbys miiciups 10 + 24= 34 



Etropus microstumus 10 + 24 = 34 



Etropus ciossotus 10 + 24 =: 34 



Azevia panamensis 33 



Psetta maxima 12 + 19 = 31 



Tbe subdivisiou of tbe flounders into genera leaves room for considerable 

 variety of opinion. Most of tbe species are well defined and easily recog- 

 nized, but tbey do not fall readily into generic groups unless we regard 

 almost every well-marked species as tbe type of a distinct genus. A natu- 

 ral result of an attempt at sbarply defining tbe genera is to reacb wbat 

 seems an extreme degree of generic subdivision. On tbe otber band, at- 

 tempts to unite tlicse smaller groujis to form larger ones often leave these 

 larger ones at once unnatural and ill-defined. 



