68 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



It agrees entirely with specimens from Misaki, of which a descrip- 

 tion follows : 



Head 3^ in bod}^ length to base of caudal; breadth of head (in- 

 cluding spines) 3^; eye 4^ in head; snout 3; maxillary 3^; D. VI 

 15; A. 17; pectoral 15; lateral scutes, 27. 





Fig. 3.— Hoplichthys gilberti. 



Head armature well developed, all ridges serrated, spines long and 

 prominent; facial margins strongly serrated, each side with four mar- 

 ginal divisions less prominent than in H. regani, separated by slightly 

 invaginated short smooth areas, each division with antrorse anterior 

 spines and posteriorly directed posterior spines, the last spine longest 

 and strongest, save those on tip of snout; the sharp thin edge no- 

 where completely interrupted, its height 

 in posterior division 4^ in longitudinal 

 diameter of eye; distance between eye 

 and preorbital margin contained two in 

 length of eye; two serrate ridges on up- 

 per edge of preorbital well developed, 

 serrations somewhat less prominent than 

 in H. gilberti; space between these and 

 preorbital margin everywhere strongly 

 concave, a continuous groove extending 

 along both ridges ; smooth area in front of 

 orbit § length of eye, and extending slightly 

 more than half way to snout; preocular 

 ridges therefore diverging lessthan in any 

 other gpecies now known; interorbital 

 space deeply concave, groove spreading posteriorly and continuous 

 with concave space between "nuchal" spines; a "postocular" spine 

 comparatively well developed, as are the "nuchal"; spines at angle 

 of mouth well developed; preopercle with two spines, outer short, 

 less than one-third length of larger; opercle with two spines, smaller 

 than inner preopercular one, and with but three main ridges. Dorso- 



FlG. 4.— HOPLICHTHYS LANGSDORFII. 



