2430 Bulletin 4.7, United States National Museum. 



the rough figure. Opisthocentrus tennis is probably also identical with 

 0. ocellatus, though the writers did not think so until after examina- 

 tion of the present large material. Coast of Kamchatka, southwestward 

 to Okhotsk Sea, generally common from Komandorski Islands to Yezo. 

 (ocellatus, with eye-like spots.) 



Ophidium ocellatum, TILESIUS, Mem. Ac. St. Petersb., n, 1811, 237, Kamchatka. D. 80; 



A. 50 ; evidently an error. The rude figure shows D. 73 ; A. 50, the spines low ; the 



dorsal with 5 ocelli. 

 Centronotus (Opisthocentrus) guinquemaculatus, KNEE, Sitzber. Akad. Wiss. Wein 1868. 



48, taf. 7, f . 20, ' ' Pinang." Described from a young specimen 2 inches long, No. 6353, 



Mus. Wien. 



Gunnellus apos, CUVIER & YALENCIENNES, Hist. Nat. Poiss., xiv, 426, 1839 ; after TILESIUS. 

 Centronotus apus, GUNTHER, Cat., in, 288, 1861. 

 Blenniophidium petropauli, BOULENGER, Proc. Zool. Soc. London 1892, 584, with plate, 



Petropaulski (Coll. George Baden-Powell) ; D. 52; A. 37; 5 ocelli. 

 Opisthocentrus tennis* BEAN & BEAN, Proc. U. S. Nat. Mus. 1897, Volcano Bay, Port 



Morusan, Japan. (Coll. Col. Nicolai A. Grebnitski. Type, No. 47565, TJ. S.Nat. Mus.) 

 Opisthocentrus quinquemaculatus, STEINDACHNER, Ichth. Beitr., ix, 25, 1880 ; BEAN & BEAN, 



Proc. U. S. Nat. Mus. 1896, 381, 392. 

 Opisthocentrus ocellatus, JORDAN & GILBERT, Kept. Fur Seal Invest., 1898. 



914. PHOLIDAPUS, Bean & Bean. 



Pholidapus, BEAN & BEAN, Proc. U. S. Nat. Mus. 1896, 389 (grelmitskii). 



Body moderately elongate, compressed, covered with very small, smooth 

 scales. .Mouth small, horizontal; bands of small teeth on jaws and 

 vomer, none on palatines. Head naked; gill membranes broadly con- 

 nected, free from the isthmus ; dorsal very long, composed entirely of flexi- 

 ble spines ; anal of soft rays ; caudal short, rounded, separate ; no ventral 

 fins ; no lateral line ; pylorio caeca present. This genus is close to Opis- 

 thocentrus, but has no pungent spines, and the head is naked. Okhotsk 

 Sea. (0oAz', PJiolis; aitovs, without feet, i. e., ventral fins.) 



2786. PHOLIDAPUS DYBOWSKII (Steindachner). 



Head 5* to 6|; depth 6 to 6. D. LXII or LXIII; A. II, 39. Eye 3| to 

 to 4f in head ; snout a little longer than eye ; lower jaw scarcely included ; 

 1 or 2 strong conical teeth on each side behind the narrow premaxillary 

 band of teeth; teeth on vomer, none on palatines; no cirri; large pores 



* Opisthocentrus tenuis is thus described: 



D. 39, XV; A. 38. Length of fish to caudal base 5} inches; length of head 1 ; depth of 

 body S; the greatest width of the body is contained 2 times in the length of the head. 

 The diameter of the eye is nearly equal to the length of the snout and is contained 4 

 times in the length of the head ; the width of the interorbital space is almost equal to the 

 long diameter of eye. The maxilla reaches to the vertical past front of eye. Teeth 

 bluntly rounded, embedded in flesh ; vomerine teeth present; palatines none. The origin 

 of the dorsal tin is over the end of the gill cover, its first 39 rays are simple and flexible, 

 the last 15 are strong spines and end slightly above the membrane in stitt" points, the 

 longest spine is almost i as long as the head. The anal originates under The twentieth 

 ray of the dorsal; its rays are divided and articulated; the longest ray is as long as the 

 head. The general color is brown with cross reticulations of black. Sides of head and 

 body along base of anal, orange; anal, caudal, and pectorals light with dusky shadings; 

 dorsal finely mottled with black and bearing 6 black spots on areas of white, the first of 

 these spots being on the sixth ray and the last on the next to last spine; a black bar from 

 front of eye downward, and another from posterior margin obliquely down and backward. 

 This species differs from the typical form in its greater compression of the body and its 

 increased number of dorsal spines. (Bean & Bean.) 



