2770 Bulletin ^1 , United States National Museum. 



185 (a). NETUMA INSULARIJM, Flora Hartley Cxreeno. 



Head 3| iu length; width of head 4^ in length; iuterorbital space in 

 length 7 ; inteiorbital space in head scarcely 2 ; snout in head 3 ; breadth 

 of mouth in head 2; eye in head 6|. D. I, 7; A. 17. Head much broader 

 than deep; snout depressed and broadly rounded; eye above the level of 

 the mouth. Upper jaw projecting. Teeth on vomer and palatines villi- 

 form and bluntly conical, the 2 vomerine patches forming together a band 

 almost as long and slightly broader than the premaxillary band, the 2 

 sides separated by a narrow interspace; palatine teeth well separated 

 from the A'omerine teeth and in 2 large triangular patches which extend 

 backward over the pterygoid region ; each triangle has a sharp notch in 

 its anterior side; its antero-posterior length is twice its lateral width ; 

 teeth of lower jaw in a narrower baud than the upper jaw. Maxillary 

 barbel extending to end of first third of the length of the pectoral spine; 

 outer mental barbel to base of pectoral; inner mental barbel past gill 

 opening, 2\ in head. Dorsal shield crescent-shaped, without median keel, 

 length on median line 2f in distance between the horns of the crescent; 

 2 notches on its anterior side to meet the corresponding points from the 

 occipital process. Occipital process broadly triaugular, with the outer 

 sides concave and 2 small projections at its posterior end. Median keel 

 evident, rather short. Occiijital process much broader at base than long; 

 its length 3^ in head; posterior breadth 2 iu length of process. Fontanel 

 broad and shallow, narrowed gradually posteriorly to a point halfway 

 between snout and base of dorsal spine. A narrow line runs back from it 

 the distance of a bmg diameter of the eye. Greatest width of the fonta- 

 nel equals the short diameter of the eye. Shields of the head granular- 

 striate, the stri* evident and extending to the middle of the iuterorbital 

 space, and on the side to meet the humeral process at the top of the gill 

 opening. Opercles nearly smooth. Gill membranes forming a fold across 

 the isthmus. Dorsal and pectoral spines crenulate in front and sharply 

 decurved serrate behind. Dorsal shorter than pectoral, which is \\ in 

 head. No axillary pore evident. Adipose fin long and low with posterior 

 margin attached. Vent much nearer ventrals than anal. Color in alcohol, 

 dark blue above, light blue on side, and white below ; maxillary barbel 

 dusky; fins all dusky. The type of this species (No. 47577, U. S. Nat. 

 Mus. ) was collected by the Albatross in the Galapagos Archipelago, being 

 part of the collection studied by Jordan »fc Bollman in 1889. It was 

 recorded by them (Proc. U. S. Nat. Mus. 1889, 179) as " Tachysurus elatturus 

 (var?)." Its relations to Netuma elaftura are close, but its fins are better 

 developed and there are several differences in details of structure. 



Netuma insularum, Flora IlAnTLEY Greene in Gu^Bert, Proc. U. S. Nat. Mus. 1896 

 (Feb. 5, 1897), 439, Galapagos Archipelago. 



69. GALEICHTHYS, Cuvier & Valenciennes. 



Dorsal shield small, lunate ; teeth on palate villiform, the patches on 

 each side not exterdiug backward over the pterygoid region. 



