380 U.S. NATIONAL MUSEUM BULLETIN 2 02 Vol. 2 



in table 118. Several other species referable to these genera were not 

 studied by me. 



RUNULA TAPEINOSOMA (Bleeker) 



Plate 120,B 



Petroskirtes iapeinosoma Bleeker, Act. Soc. Sci. Indo-N6erl., vol. 2, p. 64, 1857 

 (type locality, Amboiua in Sea). 



SPECIMENS STUDIED 



Eongelap Atoll: 2 stations, 3 specimens, 45 to 58.5 mm. in standard length. 

 Kwajalein Atoll: 1 station, 2 specimens, 39 and 53 mm. 



Description. — Dorsal rays VIII,36 or 37; anal 11,29 or 30; pectoral 

 usually 12, occasionally 11; no branched caudal ray; no tentacles on 

 eye; under side of lower jaw with or without 4 barbels; small incisorlike 

 teeth in lower jaw about twice as numerous as those in upper jaw (55 

 to 66 in lower and 25 to 34 in upper) ; no developed canine in upper 

 jaw, but last 1 or 2 of the lateral teeth may be pointed at tips, canine 

 at each side of lower jaw enormous; gill opening extending down in 

 front of bases of 4 to 6 pectoral rays. 



Head (tip of anteriormost projection of snout to rear of fleshy gill 

 cover) 4.2 to 4.8; greatest depth 7.5 to 8,4; longest pectoral ray 8.6 

 to 9.1 ; snout tip to anus 2.3 to 2.5; all in standard length. Eye 3.5 to 

 4.0; snout 3.4 to 3.6; postorbital length of head 2.0 to 2.1; least depth 

 of body 2.8 to 3.3; greatest depth 1.7 to 1.8; length from snout tip to 

 rear of mouth or rictus 2.6 to 2.8; width of gill opening 6.3 to 7.3; 

 longest dorsal spine 1.9 to 2.5; all hi length of head. Bony inter- 

 orbital space 1.0 in eye. Eye 1.0 to 1.1 in snout. 



Lips without folds; lower canines greatly enlarged, those of upper 

 jaw small, represented by 1 or 2 pointed teeth, scarcely caninelike, 

 mostly concealed by lips; teeth in both jaws firm, immovable, those of 

 lower jaw notably much smaller than in upper jaw and about twice 

 more numerous; dentigerous edge of both jaws transversely a little 

 rounded; mouth subterminal, snout notably projecting; nasal open- 

 ings with lov/ rim, distance between nasal openings on one side about 

 2 in eye; rear nostril over front edge of eye; vertical line through dorsal 

 fin origin passes about 2 pupil diameters behind eye, and a little closer 

 to rear of head than eye; sLxth pectoral ray from dorsal edge longest; 

 gill opening about % diameter of eye, the opening a little farther down 

 in front of pectoral fin base than above it ; last rays of both dorsal and 

 anal fins membranously attached to caudal peduncle but not to 

 caudal fin; lateral line absent; posterior margin of caudal fin concave 

 or forked. 



Color in alcohol. — Background coloration of lower half head and 

 body pale or white, with a brownish lateral streak broken in about 23 

 or 24 short dark brown bars that end as they meet a white line that 



