2428 Bulletin _i.'j. United States National Museum. 



2784. PLAGIOGKAMMCS HOPKINSI, Bean. 



Head 4; depth 5^; eye 5 D. XLI5 A. II, 29; V. I, 5; B. 5; scales about 

 95; ridges on side 32. Snout acute; anterior nostril tubular and nearer 

 eye than tip of snout; posterior nostril close to upper anterior margin of 

 eye; maxillary extending almost to vertical through hind margin of 

 eye; intermaxillary long, slender, and reaching nearly as far back as 

 maxillary; intermaxillary teeth in broad bands, with an outer series of 5 

 or 6 large canines, those near the symphysis largest; teeth in mandible in 

 broad bands in front, followed by several enlarged canine-like teeth; 

 ai large canine on each side of symphysis, the interspace between the 2 

 mandibulary canines receiving the canines of the intermaxillary when the 

 jaws are closed. A row of 8 pores along ramus of mandible and edge of 

 preopercle; another series around lower margin of preorbital bone as 

 described for the genus; about 8 gill rakers on first arch below angle. 

 Distance of dorsal origin from snout nearly equal to length of head ; spines 

 lowest in front, the longest spine f length of head; longest rays of anal 

 near end of fin and scarcely exceed length of eye; length of pectoral 

 equaling tliat of postorbital part of head ; ventrals close together ; inner 

 rays longest, 8 as long as head; caudal rounded, its length nearly \ that 

 of head; vent under eleventh spine of dorsal. Upper lateral line begin- 

 ning above and slightly in advance of upper angle of gill opening, curv- 

 ing very slightly over pectoral and extending to below fwenty-lifth spine 

 of dorsal, its distance from dorsal edge ecpial to diameter of eye and also 

 equal to its distance from lower lateral line; lower lateral line beginning 

 under sixteenth spine of dorsal and extending to caudal. Ou each side of 

 the abdominal ridge, between the ventrals and the vent, are about 10 8u1>- 

 pentagoual plate-like bodies, the largest about \ as long as eye. Color 

 dusky brown, the fins black. Monterey, California; a few specimens 

 dredged among rocks. Little is known about the habits of the species, 

 beyond the fact that in the aquarium it hides in rock crevices and seldom 

 ventures from its hiding place. (I take pleasure in associating witli this 

 blcnny the name of IMr. Timothy Hopkins, of Menlo Park, California, the 

 founder of the Seaside Laboratory at Pacific Grove, Monterey Bay, in 

 commemoration of his services in behalf of science. Bean.) 



riagioyrammus hopkinsi. Bean, Proc. U. S. Nat. Mua. 1893, Ci)9, Monterey Bay, Califor- 

 nia. (Type, No. 44721, U. S. Nat. Mua.) 



913. OPISTHOCENTRUS, Kner. 



Oinsthocentrvs. Knek, Sitzber. Akail. Wiss. Wien 1868, 49 (quinqucmaculaUis). 

 Blennlophidwm , Boulenger, Proc. Zool. Soc. Lond. 1892, 583 (petropauli) . 



Body moderately elongate, compressed, covered with very small cycloid 

 scales. Mouth small, horizontal, protractile, with fleshy lips ; small coni- 

 cal teeth in jaws and on vomer and palatines. No cirri. Gill membranes 

 broadly connected, but free from isthmus; branchiostegals 4. Dorsal fin 

 very long, extending from the nape to the caudal, with which it is sub- 

 continuous ; a few of the jiosterior rays are stiff spines, the rest being 



