330 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Dimensions. 



No. 1. No. 2. 



Total length 2.05 3.23 



Length of head to gill-opening 38 . SG 



Length of head to center of occipital emargination 33 .48 



Width at gill-openings (greatest width) 27 . 405 



Greatest depth 205 .27 



Tip of snout to pectoral base 40 .62 



Tip of snout to ventral base 46 .75 



Tip of snout to origin of Ist dorsal 65 1. 03 



Tip of snout to origin of 2d dorsal 94 1. 50 



Tip of snout to origin of anal 94 1.50 



Tip of snout to anterior margin of vent 53 . &2 



Length of snout .10 .16 



Longitudinal diameter of orbit 10 .16 



Interocular width 06 .08 



Length of gape of month 08 - .12 



Length of pectoral 31 .52 



Length of ventral 13 .24 



Height of longest (2d) spine of Ist dorsal .29 



Height of longest (2d) ray of 2d dorsal .32 



Height of longest ray of anal .26 



Number of series of plates (on back) and of tubes of lateral line 35 37 



Fin-formula: B. 7; P. 14 ; VI, 2 ; D. IV— 6; A. 6; C. 11. 

 The dimensions are all taken along the axis of the fish. 



3. Artedius qiiadriseriatus, sp. nov. 



B. 5 ; D. ^^;^; A. 12 ; P. 16; V. 4; 0. 2, 11, 2; Lat. line 35-37. 



Snout straight, rising at an angle of about 45°, forehead strongly 

 curved, occipital region slightly concave, depth of body at origiu of 

 dorsal only slightly exceeding that at i)osterior margin of orbit. A con- 

 spicuous supra-orbital barbel about half as long as diameter of e.\e. 

 Dorsal outline from origin of dorsal to caudal peduncle straight and 

 deflected regularly downwards. 



Grape of mouth very slightly oblique, rest of abdominal profile straight. 

 Greatest width (at preopercles) 6-^^ to nearly 7, greatest depth (at 

 origin of dorsal) about equal to greatest width ; length of head (to tip 

 of operculum) 2|- times, in total length to end of caudal. Snout about 

 equal to longitudinal diameter of orbit which is about 3| times in head ; 

 interocular width 12^-14.^ times in length of head. Depth of caudal 

 peduncle 3| times in greatest length, pectoral about 1^ in length of head. 



Head large, deep ; ascending processes of premaxillaries forming two 

 converging ridges, ending above in a blunt projection, on each side of 

 ■which, ill a line with the nostrils, is a long sharp spine. A pair of 

 spines on occiput, the interval between them concave transversely. A 

 transverse sulcus between the anterior pair of spines and the forehead. 



Eyes directed obliquely upwards, interocular space concave, narrow, 

 less than .'^ the width of the eye. 



Gape of mouth slightly oblique, maxillary reaching to the middle of 

 the pupil, its end with a slender barbel; mandible straight; jaws even 

 when tlie mouth is closed. 



