PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 331 



the scales. Between the two lateral keels arc traces of another keel; 

 traces also exist between the two dorsal keels in front. 



The si)iues are developed on all the keels except in front and beliind 

 on the two abdominal ones. The two dorsal keels, at abont the eighth 

 scale in front of the oandal fin, coalesce, after which the median furrow 

 is obliterated and the spines continue double. 



Just below the point of junction the abdominal keels also unite. The 

 two lateral ridges remain distinct throughout. At the base of the tail, 

 on each side, is a median spine between the lateral ridges. 



The abdominal ridges are farthest apart behind the base of the veu- 

 trals, in front of which and behind which they converge, but anteriorly 

 they do not meet. Breast with six or eight polygoual plates. Belly 

 transversely convex, with traces of a furrow, into which the ventrals 

 are depressible. Yent just behind the middle of the length of ventrals. 

 Lateral line about forty. 



Dorsal beginning behind the seventh dorsal scale, and extending over 

 eight scales, four scales intervening between it and the soft dorsal, 

 which covers seven scales. The anal begins under the end of the first 

 dorsal, and extends over eleven scales. Dorsal spines very delicate and 

 flexible. Pectorals reaching the eleventh scale in the upper lateral 

 series. Ventrals beginning opposite the llftli scale and extending to 

 the tenth. 



Color nearly obliterated — dark browTi, with blackish cross-bars, involv- 

 ing the fins. One bar across caudal, one across posterior i^art of soft 

 dorsal and anal, one across posterior part of spinous dorsal and front of 

 anal, and one across front of spinous dorsal. Pectorals black, with 

 whitish edging. Caudal and ventrals blackish. Belly white. 



Bimensi07i8, in htnidredihs, of length io hane of caudal fin. 



Total length 4.1 inches 



To base of caudal 3.6 inches = 100 



Height of body 12 



Height of tail 4 



Width of body 14 



Length of head 25 



Width of head.: 19 



Depth of heatl 12 



Diameter of oibi t 7 



Length of .snf)nt 9 



Length of rost ral spine 2. 3 



Cleft of mouth 0. 5 



W^idtli of mouth 0. 5 



Width of occipital pit G 



SiJaco between dorsals 8 



From front of mandible to tip of rostral s]>ine 6 



Isthmus (j 



Length of spiuo^ls dorsal 12. 5 



Length of soft dorsal p 12. 5 



Lengtli of anal 18 



Length of pectoral 18 



Length of ventral 8 



Length of caudal 13. 5 



