174 DEEP SEA FISHES. 



Lamprogrammus illustris sp. n. 

 Plate XXXIV., Plate LXXXI. fig. 1, Lat. Sijst. 



Br. r. 8; D. 112; A. 88; V. 0; P. 16-18; C. 9; LI. ca. 110. 



Brotuliforin, much compressed in body and head, less than half as wide 

 as deep. Depth equal to the length of the head or to one fifth of the total 

 length. Body chamber one third of the total. Head as deep as long, cov- 

 ered by thin scales and by mucous channels inider the skin in which occur 

 luminous organs similar to those of the lateral system on the body except 

 in resting on the bones of the skull rather than upon modified scales. Skull 

 deeply excavated for the muciparous canals. Snout more than twice as long 

 as the eye, broad, blunt, prominent on the upper ends of the intermaxillaries, 

 more prominent below the symphysis of the lower jaws ; chin prominent, 

 angular. Mouth large, oblique, cavernous; cleft extending below the entire 

 eye ; maxillary separated from the cleft by the premaxilla and reaching 

 one half diameter of the orbit farther back, wider than the eye, lower 

 edge nearly straight, upper and hinder edges concave, angles rounded off, 

 three sevenths as long as the head, thin toward the extremity. Teeth small, 

 in villiform bands on the jaws, in a narrow regularly V-shaped band on the 

 vomer, and in short and narrow bands on the palatines. Orbit small, late- 

 ral, length one half of that of the snout, one third of the width of the inter- 

 orbital space, less than one eighth of the length of the head ; orbital bones 

 prominent. Nostrils small ; posterior near the front of the upper edge of 

 the eye ; anterior more than half way fi'om the posterior to the end of the 

 snout. Suborbital bones much expanded downward over the maxillaries. 

 Gill openings wide; membranes not united, free from the very narrow 

 isthmus. Gills four, a slit behind the fourth; lamina3 short; rakers slender, 

 longest as long as the eye, first series of five on the upper section of the 

 arch and fourteen on the lower, decreasing in size to rudiments at each end 

 of the series. No pseudobranchia?. A deep cavity extending forward into 

 the head from the upper end of the first branchial arch. A moderately 

 large glandular structure, in the shape of a compressed ring, Plate XXXIV. 

 fig. 6, immediately forward of the scapula at the forward end of the lumin- 

 ous system of the body, between the latter and that of the head, under the 

 operculum and above the gills, supported behind by short swollen ribs from 

 the first and the second vertebras. 



