Cope.] "" [Jan. 5, 



Lateral line, 37 ; anal rays, 20 ; head thick ; eye, 3^, 1| in interorbital ; 



elongate T. laticeps. 



aa. Teeth on the base of the maxillary bone. 

 Lateral line, 35 ; anal rays, 19 ; eye large. 2i in head, equal interorbital ; 



elongate ; no spots T. pliodus. 



In the T. rutilus the form is rather elongate, the depth entering the 

 length (minus caudal fin), 2.66 times, while the head is short, entering 

 the length 4.5 times. The eye is large, entering the length of the head 

 three times, and equaling the width of the convex interorbital space. 

 The maxillary is toothless and reaches the vertical line of the 

 anterior border of the orbit. The muzzle is as long as three-quarters 



the diameter of the eye. Scale formula, 40 • Radii, D. 11 ; A. 28 ; 



V. 7, with a lanceolate scale at axilla. The pectoral reaches the base of the 

 ventral, but the ventral does not reach the anal. Origin of dorsal a little 

 posterior to that of ventral. The color is yellow silvery, whiter on the 

 middle of the sides. Humeral and caudal spots obscure, the former not 

 visible in some specimens ; apparently vertical where obscurely visible. 

 Median caudal rays black. 



Total length, 135 mm.; length to base of caudal, 110 mm.; length to 

 base of anal, 70 mm.; length to base of ventral (oblique), 50 mm.; 

 length of head. 34 mm. 



The specimens agree in the main with Steindachner's description,* 

 although the number of scales of the lateral line is a little greater tlian is 

 given by him. In outline of body our specimens are most like his elon- 

 gated variety (PI. ii. Fig. 3) ; but the head is shorter, since in the variety 

 tlie head enters the length four times instead of 4.5 times. 



A few specimens. 



Tetkagonopterus jacuhiensis sp. nov. 



The deepest bodied species of the Jacuhy, rather deeper than the T. 

 maculatus of Cuvier. The depth enters the length less the caudal fin 2.25 

 times, and the length of the head enters the same four times. Tlie eye is 

 rather small, entering the length of the head four times, while the inter- 

 orbital space is 1.5 times its diameter. Tlie profile of the head is slightly 

 concave ; and tliose of the back and belly are about equally convex. 



6-8 



Scales ;^6 . Radii, D. 11 ; A. 27-8 ; V. 8, with axillary scale. First 



dorsal ray a little posterior to first ventral ray. Color silvery with steel- 

 blue reflections. Humeral and basal caudal spots conspicuous, the for- 

 mer subround and situated in the centre of a pale area, which is bounded 

 posteriorly by a vertical curved black border, sometimes indistinct. Cau- 

 dal spot continued on middle caudal rays. 

 Total length, 114 mm. ; length to base of caudal fin, 95 mm. ; length 



* Sitzungsber. K. Wicn Akad., November, 1876, p. 17. 



