370 PROCEEDINGS OF THE NATIONAL MUSEUM, vol.48. 



margin of gill-membrane, 9; from posterior margin of gill-membrane 

 to upper end of gill-slit, 11.5; greatest depth at nape, 11; at anus, 9; 

 distance from tip of snout to front of dorsal, 19; to front of anal, 34; 

 length of pectoral, 5. 



Dorsal, 88; anal, 78; caudal, 5 or 6; pectoral, 8. 



The upper outline of head is straight, not longitudinally concave 

 with spatulate snout as in L. fierasfer; snout abruptly decurved at tip; 

 mandible massive, deep, the symphysis slightly protruding; maxillary 

 reaching vertical from middle of eye; teeth coarse, much larger and 

 in much broader bands than in L. fierasfer, but of approximately 

 equal size; a pair of premaxillary teeth in inner row near median line, 

 and three or four in inner mandibular row near middle of ramus some- 

 times but not always a little enlarged, more or less canine-like. Teeth 

 in both jaws widely exposed in closed mouth, the outer series in the 

 mandible not enlarged. As in other species of the genus, the mandib- 

 ular teeth are anteriorly in a broad band, which abruptly narrows 

 laterally to a single or irregular double series; premaxillary band 

 broad anteriorly, tapering laterally, but not to a single series. 



Vomerine teeth strong, reduced in number to a single pair, or some- 

 times but a single tooth is present. Palatine teeth well developed in 

 a single long series, similar to those in the jaws. Gill-slit extending 

 well above base of pectorals, as in all other species except X. parvicejps. 

 Gill-membranes joined anteriorly and free from the isthmus, the width 

 of the free fold equaling diameter of eye, the posterior margin of mem- 

 brane on the vertical descending from hinder margin of eye. Gill- 

 rakers broader than high — strikingly different in this respect from 

 L. fierasfer — spinous on the inner margin, reduced anteriorly to tu- 

 bercles, 12 in all on the anterior limb of the outer arch, one only above 

 the angle. 



Two well-developed pseudobranchial filaments in all specimens ex- 

 amined. L. fierasfer is described as having no pseudobranchiae, and 

 in the majority of specimens no trace of them is to be found. But 

 on one side of an undoubted specimen of this species, a single fila- 

 ment is present. 



Series of mucous pores on head inconspicuous. 



The length of the head and trunk is contained 3 times in the total 

 length; depth of body, 9f ; length of head, 6J. 



The anterior 6 dorsal rays are exceedingly slender, and are unseg- 

 mented, the fully segmented rays beginning abruptly behind them. 



First 3 anal rays also unsegmented, but not otherwise different 

 from the succeeding rays. 



Color pale throughout on body and fins, dark specks sparsely dis- 

 tributed, somewhat more numerous posteriorly. Anterior part of 

 mouth colorless, becoming black posteriorly, the branchial chamber 

 somewhat dusky and the peritoneum black, but these are scarcely 



