242 MEMOIRS OF THE CARNEGIE MUSEUM 



Lithoxus gen. nov. 

 Lithoxus Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 412 (name 



only). 



Very much depressed, broad; lower surface flat, naked; preopercle with a 

 bunch of spines, curved at the tip, the longest about equal to the orbit; snout more 

 or less flexible, but covered with granular plates to its margin; premaxillaries not 

 united, very short, with about two or three teeth on each side; mandibular ramus 

 much wider, with seven to ten teeth on each side; pectorals in the male prolonged 

 and densely covered with flexible spines along outer margin. Alimentary canal 

 a little more than twice the total length. 



Allied to Pseudacanthicus, the species small, 27 much depressed. 



108. Lithoxus lithoides sp. nov. (Plate XXIX, figs. 1-4.) 

 Lithoxus lithoides Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 



412 (name only). 



Type, a male, 86 mm. Amatuk. (Carnegie Museum Catalog of Fishes No. 

 1527.) 



Cotypes, eighty-six specimens, 25-85 mm. Amatuk. (C. M. Cat. No. 1528a-j; 

 I. U. Cat. No. 11951.) 



Seventy-two specimens, 25-61 mm. Warraputa. (C. M. Cat. No. 1529a-,/; 

 I. U. Cat. No. 11952.) 



Seven specimens, 30-57 mm. Konawaruk. (C. M. Cat. No. 1530a-6; I. U. 

 Cat. No. 11953.) 



Thirteen specimens, 18-52 mm. Crab Falls. (C. M. Cat. No. 1531a-c; I. U. 

 Cat, No. 11954.) 



Three specimens, 43 mm. Waratuk. (C. M. Cat. No. 1532a; I. U. Cat. No. 

 11955.) 



Head 3.2; depth 10; D. 1,7; A. 1,3 or 1,4; V. 1,5; P. 1,6; width of head an 

 orbital diameter less than its length; interorbital 3.5-4 in the head; eye 3-3.5 in 

 snout, 6-6.5 in the head; mandibular ramus 2.5 in interorbital; five plates between 

 the dorsals, ten behind the anal, twenty-three along the sides. 



Head without keels; occipital bordered by three plates behind; two or three 

 plates between the occipital and a small V-shaped plate in front of the dorsal; 

 plates of the body without keels. A circular oral disk, largely covered with warts. 

 Caudal peduncle flat below. A groove between the dorsals. Entire region in front 

 of the anal naked. Origin of dorsal about equidistant from the snout and the tip 

 27 A female 63 mm. long contains eggs about 2 mm. in diameter, 



