70 CONTRIBUTIONS! TO NORTH AMERICAN ICHTHYOLOGY IV. 



mm. Dorsal !m with (usually) morethaiilOrays:p]iaryngcal 



tn-tli mi nuToiis CA TO-K.MII' E, 30. 



kJc. Gill-opening not separated by an isthuins; lower pharyn. 



geal ImllfS llllt falciform. 



v. Throat without barbel ; no phosphorescent spots. 

 0. Lateral line present. 



j>. Lower jaw with a pillar plate: teeth villii'onii: 



tins with scaly sheaths KLOPID.K, 36. 



2>p. Lower jaw without ^nlar plate. 



</. Tongue with canine teeth; maxillary extending 



beyond evi- II Yolx iNTID.i;, 35. 



*/(/. Tongue without canines. 

 r. Mouth black within ; teeth all pointed, 



Al.r.r<M't:i'HAI.IIyE, 33 



JT. Mouth pale within; teeth on root' ami lloor of 

 inouili 1>1 ii nt and granular.. AXBULIDJE, 34. 



00. Lateral line obsolete. 



s. Lower jaw much shorter than upper. 



t. Mouth small, toothless; maxillary not 



1. aching lieyoml eye..l>i>l:<>soM.\Tll>.l . 

 it. Mouth very wide, the, maxillary reaching 



much beyond eye ExiiKAruiu:, 39. 



88. Lower jaw scarcely shorter than upper; 



maxillary compound C'LriT.in.i-:. 37. 



. Throat with a long barbel; sides with phosphores- 

 cent spots STO.MI \iii- i:. 43. 



II. VENTRAL FINS 1'KESENT, THORACIC OR JUGULAR. 



A. E- .1 > unsymmetrical, both on the same side of the In -ad I'LF.rKoNKi HIM. l'J3. 



AA. Eyefl -\ linnet rical. 



IJ. Cill-openiiigs in front of the pectoral tins. 



<'. lindy mure <u less scaly or armed with bony plates. 



li. Ventral lins completely united; gill membranes joined to the isthmus. 



<;<>mii'.i:, 101. 

 1 1 >. Ventral tins separate. 

 E. Ventral ra\ s I. "\. 



nliorhital with a bony stay, which extends across the checks to or to- 

 ward the prcoperele; cheeks 

 sometimes entirely mailed. 

 G. I'- ctoral I'm u it h ',! or I', lower rays detached and free. 



TI:I-.I 11 M . 108. 

 1'ci'toral tin cut ire. 

 II. Slit behind fourth ^ill small <u wanting. 



I. Anal spines :; Si < HIP i M i i:. I oil. 



II. Anal spioea obsolete COTTIDJS, 107. 



Illl. Slit behind fourth -ill lar-e ' ( 'iiini D.I:, !(>.">. 



IT. Siibm -bital .-I a\ \\antin^; i hei ks not mailed. 



.1. Spinoiis dorsal transformed into a lamdlati'd siidving disk. 



I i in \i ii>ti> ];. 70. 



.1.1. BplnOOB dorsal (if present) DOi transformed into a sucking disk". 

 K. Doi ;.! spines all orneailx all disconnected from each other. 



L. I '.od \ i-lon -::!,, |i rcle I'.. 1 \( A I I D.i;. 7 1. 



I I. Body oblong or ovate, compressed. 



M. Caudal peduncle \<ry slender, the (in widely forked. 



t'AKAX(iJi>.]-:, 75. 



