2782 Bulletin 4.7, United States National Museum. 



included, lips thick; teeth villiform, the anterior ones in the jaws longer; 

 depth of the intermaxillary band 4 in its width; palatine patches 1 diam- 

 eter of* eye apart, the width of the patches less than 1 diameter of eye. 

 Gill membranes meeting in an angle, forming a fold across the isthmus. 

 Gill rakers 6 + 11. Pectoral pore none; vertical series of pores present. 

 Distance of dorsal spine from the snout 2| to 2| in the length, the spine 

 broken in the specimens examined. Space between dorsal and adipose 

 fins 4 to 4 in the length. Adipose fin adnate, as long as the anal fin; 

 ventrals2| in the head; pectoral spine serrated behind (broken). Two 

 specimens 0.22 m. and 0.26 m. long. Para. Agassiz and Bonrget. (Eigen- 

 mann & Eigenmann, Nematognathi, 83.) 



196. GALEICHTHYS PHBTGIATUS (Cuvier &. Valenciennes), text, p. 130. 



74. TACHYSURUS, Lac^pede. 



Teeth on palate granular; dorsal shield small; palatine bands of teeth 

 without backward projecting angle. 



197. TACHYSURUS NUCHALIS (Gunther). 



D. I, 7; A. 21; P. I, 10. The height of the body of the total length 

 (without caudal), the length of head i. Head as broad as high, its greatest 

 width being its length; its upper surface granulated; occipital process 

 triangular, as long as broad, with the lateral margins slightly concave; 

 it is elevated into an obtuse ridge running along the middle; the longi- 

 tudinal groove in the middle of the forehead is rather wide, narrow 

 behind, and does not extend to the base of occipital process. Teeth on 

 palate are coarsely granular, and form 2 subtriangular patches of moderate 

 extent, which, sometimes, are subcontinuous with their anterior angles. 

 The maxillary barbels extend nearly to end of pectoral. Dorsal spine 

 of moderate strength, slightly serrated along both edges, length of 

 head; adipose fin small, shorter than dorsal; pectoral spine as long as, 

 but stronger than, that of dorsal ; pectoral fin shorter than head. British 

 Guiana, a-c. Six inches long. Purchased of Mr. Scrivener, d-f. Young. 

 Presented by Sir R. Schoinburgk. (Gunther, Cat., v, 171.) 



198. TACHYSUEUS FISSUS (Cuvier &- Valenciennes) . 



D. 1, 7 ; A. 20 or 21. Length of head i of the total (without caudal). The 

 distance between the end of snout and that of occipital process ^ of the 

 total length (with caudal); basal bone of dorsal spine small. The teeth 

 on the palate form 2 separate subovate patches. The maxillary barbel 

 extends to, or nearly to, the middle of pectoral fin. Adipose fin small. 

 Cayenne, a-b. Presented by Prof. R. Owen. These specimens having 

 h;idthe cavity of the mouth and of the gills extended in an extraordinary 

 manner, I was induced to examine the cause of it, when, to my great sur- 

 prise, I found them filled with about 20 eggs, rather larger than an ordi- 

 nary pea, perfectly uninjured, and with the embryos in a forward state of 



