558 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



curve to the occiput, thence straight to the subconic snout, which 

 projects beyond the front of the premaxillaries half its horizontal 

 projection beyond the eye The tip of the snout bears two rather 

 prominent spiny tubercles; preocular length of snout, 3.25 in head; 

 preoral length, 4.0; length of orbit, 3.0. The least interorbital width 

 is nearly equal to the length of the orbit; the suborbital is wider 

 than the pupil. The upper jaw extends backward to below the pos- 

 terior margin of the pupil; its length is contained 4.4 times in the 

 head. The gill-membranes unite below the preopercular ridge; there 

 are seven branchiostegal rays. 



The scales are armed with about 10 slightly divergent rows of 

 spinules. The scales are larger than in condylura, there being, but 

 9 (8 to 9-i) instead of 11 rows between the origin of the second 

 dorsal fin and the lateral line series. 



The center of the anus is a little nearer to the origin of the anal 

 fin than to the insertion of the ventral. 



The second dorsal spine, which is strong basally, is armed with 

 12 (9 to 15) rather large and well-spaced denticulations. The 

 lengths of the various fins are given in the table of measurements. 



Color in alcohol, light brown, becoming blackish, with a silvery 

 sheen, on the opercles and over the coelomic cavity. The buccal and 

 branchial cavities are lined wholly with blackish except near the 

 corners of the mouth and along the edge of the opercular and branchi- 

 ostegal membranes. The black color of the parietal peritoneum is 

 underlain by silvery. 



Table of measurements in hundredths of lengths to anus. 



A Ibatross 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 



Height of second dorsal spine 



Height of third dorsal ray 



Length of first dorsal base 



Interdorsal space 



Length of pectoral 



Length of outer ventral ray 



Length of second ventral ray 



Soft rays, first dorsal 



Ventral rays 



Pectoral rays 



Scales (series separating lateral line 



from origin of second dorsal) 



Denticulations of dorsal spine 



Gill-rakers, second arch 



Sex 



5621 



2 132 

 32.5 

 75 

 24 

 19 

 10 

 24 

 22 

 22 

 12 



m 



5621 

 131 

 31 

 79 

 26 

 19 

 11 

 26 

 23 

 25 

 15 



78 



11 

 14,15 



(<) 



5621 

 2 125 



12 



13,14 



22 



( 3 ) 



5589 



2117 

 34 

 80 

 27 

 20 

 12 

 28 

 22 

 25 

 13 

 85 

 70 

 58 

 27 

 34 

 44 



11 

 15, 15 



<«) 



5589 



2 146 

 37 

 78 

 27 

 19 

 11 

 27 

 22 

 23 

 13 

 80 

 78 



24 

 34 

 43 

 62 

 27 

 11 

 15, 15 



(«) 



155S9 

 164 



13 



15,13 



20 



5589 



157 

 33 



79 

 27 

 22 

 11 

 28 

 27 

 22 

 12 



11,14 

 21 



(») 



5589 



107 

 25 

 81 

 30 

 22 

 12 

 27 

 26 

 25 

 14 

 69 

 82 

 71 

 26 

 34 

 40 

 68 

 25 

 11 

 13,13 



1 Type-specimen. 



(evides, pretty.) 



2 Pseudocaudal developed. 



3 Male. 



'Adult female. 



