Collection of Chinese Fishes. 243 



the first dorsal black, with the rajs somewhat elongate in the 

 male. 



Numerous adult specimens, 2-3 inches long. 



21. Mastacembelus sinensis. 



Rhynchobdella sinensis, Bleek. Versl. & Meded. Ak. Wet. Amsterd. 

 1870, p. 249, c. fig. 



D. 30-34 I 60. A. 3 ] 70. 



Praioperculum without spines. Kostral appendage extremely 

 short. The maxillary extends to below the front margin of 

 the eye. Vertical fins continuous. Brownish, with a broad, 

 sti-aight, blackish-brown band along the side of the body ; the 

 parts below the band marbled and reticulated with brown. 



inches. 



Total length 7^ 



Length of the head 1| 



Length of the tail 3| 



Differs from M. maculatus in having the cleft of the mouth 

 wider. 



22. Polyacanthus opercularis, L. 



23. Mugil soiuy^ Basil. 



A veiy slender species, with adipose eyelids, nine anal rays, 

 and forty-four scales in the lateral line. 



24. Cynoglossus rohustuSy sp. n. 



? Cynoglossus oligolepis, Steindachner, Wien. Sitzsb. Iv. 1867, p. 587 

 (not Bleek.). 



D. 131. A. 102. L. lat. 83. 



Two lateral lines on the left side ; when counted at the end 

 of the abdominal cavity, the upper line is separated from the 

 middle by ten longitudinal series of scales. One lateral line 

 on the right side. One ventral united with the anal. Two 

 nostrils — one anteriorly between the eyes, the other in front of 

 the lower margin of the lower orbit. The upper eye is scarcely 

 in advance of the lower ; the width of the interorbital space is 

 less than the diameter of the eye, which is a little nearer to the 

 end of the snout than to the gill-opening. Lips not fringed. 

 Length of the snout contained twice and a fourth in that of 

 the head. The angle of the mouth is opposite to the posterior 

 margin of the eye, and exactly in the middle of the length of 

 the head. The rostral hook terminates behind the symphysis 

 of the mandible. The height of the body is two ninths of the 

 total length, the length of the head one fifth. Uniform light 

 brownish. 



One specimen, 12^ inches long. 



