NO. 1293. JAPANESE BLENNOID FISHES— JORDAN AND SNYDER. 483 



18. OPISTHOCENTRUS Kner. 



OpistI lucent rus Kner, Sitsber. Akad. Wiss. Wien, 1868, p. 49 {quinquemacidatus). 

 Blenniophidium Boulenger, Proc. Zool. Soc. Lond., 1892, p. 583 {petropatili). 



Body moderately elongate, compressed, coyered with yery small 

 cycloid scales; head with small scales; mouth small, protractile, with 

 Heshy lips; small conical teeth on jaws and on vomer; no cirri; gill- 

 membranes l)roadly connected, ])ut free from isthmus; I)ranchiostegals 

 i: dorsal tin very long, extending from the nape to the caudal, with 

 which it is subcontinuous, a few of the posterior rays stiff spines, the 

 rest being simple, not articulate, flexible; anal tin extending from the 

 anus, which is a little nearer the anterior than the posterior extremity, 

 to the caudal, with two slender spines in advance of the soft rays; no 

 ventrals; no lateral line; no prominent anal papilUv; pyloric append- 

 ages present. A remarkable genus, allied to Lumjjenm, or rather to 

 PJeetohranchus, distinguished by having only the posterior spines rigid. 



North Pacific. 



{oniffOe^ behind; Kevrpoi\ spine.) 



a. Dor«xl ra.ys about 59 ; anal II, 36; no t^harply defined cross-streaks on head; dorsal 



fin with about 6 black ocelli oceUatus, 29. 



aa. Dorsal rays aliout 51; anal II, 33; head with sharply defined cross-lines like pen 

 marks; dorsal fin with about -1 1)lackish spots zonope, 30. 



29. OPISTHOCENTRUS OCELLATUS (Tilesius). 



GAZU. 



Ophidium ocellatum Tilesius, Mem. Ak. St. Petersb., II, 1811, p. 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. 

 Gunnellm apoH Cuvier and Valenciennes, Hist. Nat. Poiss., XIV, 1839, p. 426, 



after Tilesius. 

 Centronotus apos Gunther, Cat., Ill, 1861, p. 288. 

 Ccntronotus {Opisthocentrus) quinquemacidatus Kner, Sitzber. Akad. Wiss. Wien, 



1868, p. 48, pi. VII, fig. 20; "Pinang." Described from a young example 



2 inches long. No. 6353, Mus. Wien. Doubtless from Decastris Bay. 

 Opisthocentrus retkidatns Steindachner, Ichth. Beitr., X, 1881, p. 11, pi. v, fig. 2; 



Gulf of Strielok (Coll. Prof. Dybowski). 

 Blenniophidium petropmdi Boulenger, Proc. Zool. Soc. Lond., 1892, p. 584, with 



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

 Opisthocentrus tenuis Bean and Bean, Proc. U. 8. Nat. ]Mus., 1897 (January 28), 



p. 463, pi. XXXV ; Volcano Bay, Port Mororan, Japan. (Coll. Col. Nicolai 



A. Grebnitski. Type No. 47565, U.S.N.M.) 

 Opisthocentrus quinquemacidatus SrEiNVACHHER, Ichth. Beitr., IX, 1880, p. 25. — 



Bean and Bean, Proc. U. S. Nat. Mus., 1896, pp. 381, 392; Petropaulski. 

 Opisthocentrus ocellatus Jordan and Gilbert, Rept. Fur Seal Invest., 1898, p. 



384.— Jordan and Evermann, Fish N. and M. Amer., Ill, p. 2429. 



Head Sf in length; depth 6; depth of caudal peduncle 2| in head: 

 eye 4|; interorl)ital space 5|; snout (>; D. LIX; A. II, 8(>. 



luterorbital space low, flat; snout sharp; jaws equal; mouth oblique, 



