560 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Fin-rays — first dorsal II, 11 or 12; pectorals, 20 to 23; ventrals 

 (39 fins counted), 11 to 13. 



The body is very deep, and sharply compressed posteriorly; in 

 some specimens the depth is constricted behind the trunk much 

 more than in others. The origin of the dorsal fin is at the apex of 

 a triangular elevation of the dorsal contour. The horizontal pro- 

 jection of the snout is half as long as the pupil. The least width 

 of the oblique suborbital is a little more than half the orbital length. 

 The barbel is decidedly more than half as long as the orbit. The 

 preopercular ridge is separated above from the orbit by a distance 

 equal to the diameter of the pupil; the ridge is arched backward a 

 little at the angle. There are seven branchiostegals and about eight 

 rudimentary gill-rakers. 



The scales are rather small, being in eight or nine series from the 

 origin of the second dorsal to but excluding the lateral line. The 

 scales are reduced in size on the upper and under surfaces of the 

 head ; those in front of the anal fin are sometimes enlarged as though 

 vertically fused. In the larger specimens the scales of the body bear 

 six to eight parallel or slightly divergent rows of spinules. 



The first dorsal spine is sharp and robust; the second spine may 

 be lower or a little higher than the length of the head ; it is armed 

 by 23 to 37 denticulations in four specimens, 39 to 46 mm. long to 

 the anus, and by 16 in one specimen of 33 mm. The interdorsal space 

 is very much longer than the orbit. 



For comparison with L. decimalis we include the following 

 measurements : 



Table of measurements in hundredths of length to anus. 



Albatross station 



Total length in mm 



Length to anus in mm 



Length of head 



Length of orbit 



Width of interorbital 



Width of suborbital 



Orbit to preopercle 



Length of snout 



Length of upper jaw 



Length of barbel 



Depth of body 



Anus to anal 



Height of second dorsal spine . 



Interdorsal space 



Length of pectoral 



Length of outer ventral ray. . . 

 Length of second ventral ray . 



5439 

 1227 

 46 

 81 

 26 

 20 

 14 

 31 

 26 

 24 

 19 

 90 

 9 

 91 

 32 



33 



5654 

 233 

 42 

 83 

 29 

 22 

 14 

 33 

 29 

 29 

 17 

 84 

 11 

 75 

 37 

 45 

 43 + 



5607 

 223 

 40 

 80 

 26 

 20 

 14 

 30 

 27.5 

 28.5 



5469 

 207 + 

 39 

 79 

 27 

 23 

 15 

 32 

 26 

 32 

 16 

 80 

 9 

 70 

 41 



5467 

 144 

 26 

 85 

 30 

 22 

 15 

 33 

 26 

 34 

 20 

 81 

 10 



411 



1 A pseudocaudal developed. 



(pumiliceps, in reference to the shortened head.) 



69. LIONURUS DECIMALIS, new species. 



Type-specimen.-^Cnt. No. 82668, U.S.N.M. : 155 mm. long, 38.5 

 mm. to anus; dredged with a single paratype of about the same 

 size at Albatross station 5348 in Palawan Passage; 375 fathoms; 

 56.4° F., bottom temperature. 



