2772 Bulletin ^7, United States Natio7ial Museum. 



openings, the postmeutals about 1 dianieter of the eye farther. Jaws sub- 

 equal, the upper louger ; teeth all fine, villiform ; intermaxillary band of 

 teeth very wide, its depth about 8 in its width; 2 small patches on the 

 vomer; palatine patches very Avide and shallow, tapering to a jioint. Gill 

 membranes meeting at an acute angle, forming a fold across the isthmus; 

 gill rakers 3-|-10. Humeral process very thin, covered with skin, more 

 than \ as long as the pectoral spine, broadly expanded and rounded 

 behind; pectoral pore present. Distance of dorsal spine from snout 2| 

 to 2| in the length; the dorsal spine broken off in all the specimens; dis- 

 tance of adipose from the dorsal 33 to 3j in the length; adipose fin as long 

 as the dorsal tin, adnata ; caudal fin broadly lunate, the upper lobe longer, 

 falcate, 3i in the length ; anal fin higher than long,the highest ray 2 to 2| 

 in head; ventrals reaching to the anal, li to 2 in head; pectoral spines 

 broken in all the specimens. Back, top of head, and a band from humeral 

 piocess to the lower caudal lobe, l)lue black; a broad conspicuous, bluish- 

 silvery band along the lateral line ; lower parts white ; fins blackish ; 

 ventrals and anal sometimes with light areas. Eleven specimens, 0.25 to 

 0.35 m. long. Callao, Peru; Haslar Expedition. (Eigenmann & Eigen- 

 mann, Nematognathi, 5.) 



Subgenus HEXANEMATICHTHYS, Bleeker. 



.Shields not entirely covered by soft skin, the granulations evident, 

 especially in the male. 



187. (ULEICHTHYS SEEMANNI (Giinther). 



D.I, 7; A. 19; P. 1, 10. The height of the body is contained ^\ times 

 in the total length (without caudal); the length of the head 2^; head 

 nmch broader than high, its greatest width being e(iualto its length with- 

 out snout. Eyes of moderate size, much nearer to the end of the snout 

 than to the operculum ; the length of the snout is f of the width of the 

 iuterorbital space. The median longitudinal fonticulus on the upper side 

 of the head extends to the base of the occipital process. Teeth on the 

 vomer separated in the middle by a short interspace, forming a pair of 

 small subquadrangular patches which are confluent with those of the pala- 

 tines. The latter are much longer than broad, elliptical. The band of 

 intermaxillary teeth is 5i times as broad as long. The maxillary barbels 

 extend nearly to the end of the head, and are about twice as long as the 

 outer ones of the mandible. Crown of the head, and nape iinely granu- 

 lar; occipital process broader than long, with a prominent ridge along 

 its middle. The basal bone of the dorsal spine is small, witli a few fine 

 granules. Dorsal spine of moderate strength, more than i as long as the 

 head, serrated along both edges; the first soft ray is as high as the body. 

 Adipose fin rather shorter than dorsal. The upper caudal lobe is the 

 longer, \ cii total length. Porus axillaris present. Ventral fin shorter 

 than pectoral. Sides of the body silvery; basal half of the inner side of 

 the pa.ired fins black. Central America. A fine specimen 12 inches long, 

 from the Haslar collection, collected by Dr. Seemann. (Giinther.) 



Ariui geemanni^ GOnthke, Cat., v, 147, 1864, Central America. 



