374 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



at anus, 7.5; distance from tip of snout to front of dorsal, 20; to 

 front of anal, 36; length of pectoral, 5. 



Dorsal, 81; anal, 72; caudal, 6; pectoral, 5. 



Upper contour of head obliquely descending from occiput in a 

 straight line, the occiput slightly depressed; snout not so deep as 

 in L. mandibularis , the mandible less massive. Maxillary reaching 

 a vertical dropped from posterior edge of pupil; jaws equal, the 

 mandible not protruding. Teeth larger than in any other species of 

 the genus, the anterior series in the symphyseal half of the mandible 

 developed as curved canines, at first directed horizontally, and not 

 opposed to any in the upper jaw. The outer series in the premaxil- 

 laries are sometimes also enlarged to form similar but smaller canines. 

 Both mandibular and premaxillary teeth are in moderately broad 

 bands anteriorly, the mandibular band is abruptly constricted poste- 

 riorly to a single series, the premaxillary band is narrowed laterally 

 and in both jaws the lateral teeth are much reduced in size. Only 

 one or two vomerine teeth present, the palatines in a single series, all 

 very small. 



Gill-slit extending well above base of pectorals; gill-membranes 

 anteriorly joined and free from the isthmus, the posterior margin 

 crossing the isthmus at a point slightly posterior to the mandibular 

 joint. Gill-rakers short and rather broad, but narrower than in 

 mandibularis, 11 or 12 on anterior limb of outer arch. Two or three 

 short pseudobranchial filaments. 



Mucous pores inconspicuous, but evident on top and sides of head, 

 and in a short series on body immediately behind the head. 



Ten or 11 anterior dorsal rays slender and unsegmented, the 

 anterior 3 anal rays also unsegmented. 



Color light, with sparse black specking on the body, this becoming 

 more pronounced on posterior part of the body and on the vertical fins. 

 Inside of mouth and gill-cavity largely black, as is also the peritoneum, 

 the silvery pigment of the abdomen masking the black from without. 



In addition to the type are 5 paratypes from station 4257, near 

 Funter Bay, southeastern Alaska, depth 350 fathoms. One of these 

 a young specimen. 



NEMATONURUS ABYSSORUM, new species. 

 Plate 21, fig. 23. 



Type-specimen. — Cat. No. 75827, U.S.N.M., 803 mm. long, from 

 station 4390, off Santa Catalina Island, lat. 33° 02' 15" N.; long. 120° 

 42' W.; depth, 1,350 to 2,182 fathoms. 



Dorsal, II, 10; pectoral, 19; ventral, 11. 



Body deep; head without prominent ridges, projecting angles, or 

 enlarged canals, the texture unusually firm. Anterior profile de- 

 scending in an even curve from front of dorsal to tip of snout, the 



