110 mxTKir.rnoNs TO NORTH AMKRICAX ICHTHYOLOGY iv. 



..ccipital and imrliul re-ions, which are armed with bony bucklers. 

 Marine cat iMies. Species \epy numerous in the tropical seas. This 

 up has been divided into many genera, 1 lie value of which we are 

 unable in determine. Our coniiiioii species is not a typical Ari/is. lnt the 

 -.mis to which it belongs has not been properly < Id hied. (From Art 

 , tin- IJen.ualese name of the typical species.) 



Ti-i-ili ;ill \ illit'orm. in :i lar^c- r<>un<lril patch on each paint inc :ui<l a small one on 

 cadi -idc ul' tin- \niucr, these patches all distinct; posterior buckler .small. 



1 1O. A. felis (Linne') J. & G.Xi <'<il-ftsh. 



Steel lilne, sides and l>clly silvery. Body ratlier elongate, not com- 

 pressed, tapering .nto the slender tail. Head subconic, de])ressed, tlat- 

 tisli above. Maxillary barbel nearly as long as the head. Mouth small. 

 Eye moderate, just iu front of the middle of the head. Gill membranes 

 broadly united, partly joined to the isthmus, forming a narrow, free fold 

 across it. A small, bony, granulated buckler, broader than long, in front 

 of base of dorsal spine; then a much larger nuchal shield with a me- 

 dian keel, and a still larger occipital shield with a median furrow. A 

 lo\v llesliy keel along the back. Humeral process nearly half the length 

 of the pectoral spine. Caudal deeply forked, the upper lobe the longer. 

 Head :: ; : depth 5. D. I, 7, its spine not filamentous, serrate in front; 

 I'. I,i; A. 1(5. L. L'l inches. Cape Cod to Florida; common south- 

 ward. 



luniH filis Linnc", Syst. Nat.: Arias miUx-rti Cuv. t V Val. xv. 74: Ar'nt* 



n i, \ , ir,r>.) 



111. A. M|ii"l:-js l;.iin] A (iirard. 



Similar, lnit with the spines higher and the maxillary barbels much 

 loimei, reaching to the middle of the pectorals. 1'ectorals reaching to 

 !;i-t ra\ of dorsal. Dentition and character of the cephalic bucklers 

 nndesciibed. Head 1. 1). I, 7; A. 15: I'. I, 0. Coast of Texas; a 



doubtful .species. 



nl A liirar.l, I'n.r. Aca.l. Xal. S-i. I'liila. !&%, 26 ; (iiiuth.T. v, 173.) 



. i:i>I KD< III IIVS I'.air,! A 

 Cut /is 



(. \ilitrii-litliti* l'.;iir.l A Ciiai.l, I'mr. A- -ail. Xat. Sci. I'liila. t-.'.l.'Ji'.: lypi- Silurim ntri- 

 M iicliill.) 



l'.od\ rather elongate, little compressed. Head depressed, broad 

 abo\r. Month la r-e, the upper jaw (lie longer. Teeth all villilbrm; those 

 on the \oiner and palatines Ibriuing a more or less perfectly crescent- 



t \,,t,,riiix (;ill,Proc. Aca<l. Nat. Sci. Phila. 1663, 171: type Arius milbcrti 

 < A V. ^. Iriu- . 



