168 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



diverge anteriorl}^; the superorbital ridge is somewhat raised, and 

 were the iuterorbital ridges absent, the interorbital space would be 

 concave. Preopercle with a large, sharp spine at its edge on a level 

 with suborbital stay, and 3 or 4 slight, sharp tubercles covered with 

 skin on its edge below. A long sharp spine on posterior edge of 

 preorbital reaches backward past end of maxillary nearly to below 

 posterior orbital margin, and a small spine at its base, which is directed 

 downward. Anterior limb of first gill arch with 8 or 9 very short 

 blunt gill-rakers. Pseudobranchiaj present. Gills 3^, no slit behind 

 the last. 



Pectoral reaching past tips of ventrals to opposite vent; pectoral 

 rays 11, all branched. Dorsals without a notch between them; the 

 first spine less than half the length of second; second and third sub- 

 equal li to 1\ times in head, the third to sixth decreasing in length 

 backward and the remaining ones subequal, the last spines two times 



Fig. 19. — Pakacentropogon eubeipinnis. 



in head, and equal to the longest rays; last dorsal ray connected to 

 body for nearly its full length by a membrane. (These measurements 

 taken from a specimen 10 cm. in length.) In specimens 6 cm. in 

 length the first spine is longer in comparison with second, which latter 

 is equal to half head, and the posterior spines behind the fourth are 

 subequal in length and contained 2i times in head. Third anal spine 

 longer, but equal to second in diameter; its length 2| in head. 



Head and body appearing to the naked ej^e and to the touch naked; 

 under a lens, however,, the posterior part of the body is seen to be 

 sparsely covered with small, round, embedded, nonimbricated scales, in 

 greater or fewer numbers (sometimes entirely absent) and not always 

 of the same size; these not developed anterior to the tip of the pec- 

 toral. 



Color in spirits: Sides and backs mottled and spotted with small 

 irregular dark-brown or black spots, sometimes arranged to form very 



