330 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Diviensions. 



No. 1. No. 2. 



Total length 2.05 3.23 



Length of head, to gill-opening 38 .56 



Length of head to ceater of occipital emarginatiou 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 suout 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 .82 



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 1st dorsal .29 



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



Height of longest ray of anal .26 



Number of serit^s 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 ai'c all taken along the axis of the fish. 



3. Artedius quadi-iseriatus, sp. no\ . 



B. o ; J). ^^-^; A. 12 ; l\ Hi ; A . 4 ; (1 2, 11, 2; Lat. line 35-37. 



Snout straight, risiuft at au angle of about 45°, forehead strongly 

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

 dorsal only slightly exceeding that at posteiior margin of orbit. A con- 

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

 Dorsal outline from origin of dorsal to <;audal peduncle straight and 

 deflected regularly downwards. 



Gape of mouth very slightly obhque, rest of abdominal profile straight. 

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

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

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

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

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

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



Head large, deep ; ascending processes of premaxillaries forjuing two 

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

 which, in 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, maxiUary reaching to the middle of 

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

 when the mouth is closed. 



