12 CATALOGUE OF I'lSll. 



Mexico and South America. British and Paris Museuius. 



Length, 14 in. Length up to anus, 63 in. From tip of snout 

 to gill-opening, 1-58 in. Length of the gape, 0-59 in. 



20. MUR^NOPSIS DICELLURUS. 



Opliisurus dicellurus. Rich., Voy. of Sulph. p. 100, pi. 48, f. 2, 3,4 ; 

 Hepurt, 1843, p. 312, Voy. Ereh. d Terr. p. 105. 



Still shorter than preceding. Fourteen rays in the pectoral fin. 

 Commencement of the dorsal opposite to the tip of the pectunil. 

 Throughout, down to the tail, the height of the dorsal is the same; 

 but there, in common with the anal, it firat becomes lower, and 

 then wider again, so that the two fins form an ovate lobe, which 

 rounds off, at the extremity of the tail, more suddenly than it 

 rises. The last rays of both fins are very short, and approach as 

 near as possible to the extreme point of the tail, without ab.solutely 

 going round it. The specimen is bleached by maceration in 

 spirits. 



Length, 9'85 in. From tip of snout to the anus, 039 in. To 

 the gill-opening, 1-35 in. [Richardson.) 



China. Estuary of the Yantze-Keang. Brit. Mus. 



21. MUR^NOPSIS TEISEEIAUS. 



The upper jaw is longer than the mandible, the latter being 

 overreached by the nasal teeth. Anterior nostril tube broad, pretty 

 long, and hanging down with a filament on its inner side. Poste- 

 rior nostril situated on the margin of the lip, and covered by a 

 broad cutaneous tag. Eye large, and placed a little posterior to the 

 middle of the long gape. Pectoral fin pretty well developed, and 

 only a little shorter than the gape. 



This is an elongated species, with a tail longer than the body. 

 The dorsal begins opposite to the tip of the pectoral, and the anal 

 fin becomes, near its end, thicker and higher than elsewhere. 



Seven nasal teeth, 2 in front, and 4 on the mesial line. Nine 

 vomerine teeth. Eighteen palatine teeth in the outer row; 10 in 

 the inner row. Outer row of mandibular teeth, 19; inner row 

 composed of 23 shorter ones. 



Ground colour of the head and throat brownish, thickly marked 

 with round black spots. Margins of the tins blackish. Two rows 

 of large, round spots, extending along the dorsal fin and lateral 

 line, and a third row, going as far as the anus. Belly silvery, finely 

 dotted, and streaked with brown. 



Length of the body, 16-34 in.; of the tail, 19-75 in. Length of 

 the gape, 1-69 in. ; of the pectoral, 1-2 in. 



Pacific (discovered by Dr. Goodridge, on the voyage of the 

 Herald. Brit. Mus.) 



