Cope. ] 44 {May 4, 
The dorsal region is crossed by five wide brown spots, the anterior be- 
tween the bases of the pectoral fins, those following becoming successively 
nearer together. They are all joined together on the sides by a brown 
border which presents processes downwards so as to be scolloped. Be- 
low this the surface is white. The dorsal spaces enclosed between the 
spots, together with the top and sides of the head are marked with a crim- 
son network. Two chain-like bands on the operculum, and two on the 
base of the pectoral fin. 
The precise locality from which this species was obtained, has not been 
preserved. 
32. ATHERINA LATICLAVIA Cuv. Vol. X, p. 478. 
No. 41, Callao Bay. 
33. BELONE ?TRUNCATA Les. Gunther Catal. Fishes Brit. Mus. VI. p. 224. 
Differs from Atlantic specimens in having the tail evenly though slightly 
emarginated. Radii; D.14; A. 17. No. 42: from Callao Bay. 
I find that in the genus Belone, the coronoid bone is distinct from the 
other mandibular bones, and is well-developed. In Amia, where it has 
been stated to be distinct, it is codssified in old individuals. 
34. ORESTIAS CUVIERII Cuv. Val. XVIII p. 225. 
Fin radii; D. 15; A. II. 16. Scales in fifty-three transverse series to 
above superior extremity of branchial fissure. Orbit one-fifth of head ; 
length of head 3.5 times in total without caudal fin. Top of head and each 
side of anterior dorsal region naked. 
No. 142. Lake Titicaca. 
30. TETRAGONOPTERUS IPANQUIANUS, Sp. nov. 
This species is furnished with a series of teeth on the maxillary bone as 
in the 7. pectinatus, T. polyodon, etc., but is only camparable to the 
latter in adding to this character, a reduced number of radii of the anal 
fin. It differs from it in the smaller and more numerous scales. 
The head is short, and the lower jaw robust and somewhat protuberant. 
Its length enters the total with caudal fin 5.75 times; it includes the 
diameter of the eye four times, which enters the diameter of the very con- 
vex interorbital space 1.6 times. Muzzle abruptly descending, shorter 
than orbit. The proximal two-thirds of the maxillary bone toothed. Dorsal 
fin originating behind the basis of the ventral, its last ray standing above 
the first anal ray. Caudal fin deeply forked, the superior lobe larger. 
Radii; D. I. 9; A. I. 28. Scales 11-54-61-8. The general form is mode- 
rately elongate, the depth entering the length without the caudal fin, three 
and one-fifth times. 
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