'M FLATFISHES (HETEROSOMATA) 



Brownish ; head and body with a number of small dark spots, with or without pale 

 margins : median fins blotched and spotted with darker. 



Type. — Not traced.' 



Distribution. — Chinese seas ; coast of Indo-China. 



Specimens Examined : 



-• (300 mm.), stuffed. Chma. R.-cves. 



I (iSS ,, ). .. .Swmhoc. 



I (nn ,, ). Amov, China. Chen. 



I (1S5 ,, ). — Haslar Coll. 



This species appears to be indifferently sinistral or dextral. 



Cenus 2. THYSANOPSETTA. 



I hysaiivpidta, (iiinthcr, iS8u, Shore Fishes " Challenger", p. 2- [Thysanofu-tia narcsi, Gilnther]. 



Body rather elongate, compressed. Ej'es on the left side, separated by a narrow, 

 Hat, scaled space. Olfactory laminae few in number, radiating from a short central 

 rachis. Mouth of moderate size, the length of the maxillary nearly \ that of head ; 

 jaws and dentition alwut equally developed on both sides ; rather broad bands of 

 small conical teeth in both jaws ; vomer toothless. Margin of gill-cover fringed ; 

 gill-rakers long, slender ; lower pharyngeals each with .several rows of small conical 

 teeth. Dorsal fin commencing above nostrils of blind side and just in front of upper 

 eye ; anterior rays close together ; all the rays simple, not scaled, l^ectoral fins 

 unequal, that of ocular side larger ; rays all simple. Pelvic fins short-based, subequal 

 and subsymmetrical. Scales small, ctenoid on both sides of body. Lateral line 

 equally developed on both sides of body, with a very slight curve above the pectoral 

 fin ; no supratemporal branch ; tubules simple. .A. prominent flat lobe (? including 

 the urino-genital papilla) behind the pelvic fin of ocular side and above the commence- 

 ment of the anal fin ; vent a little on blind side. 



.\ single species from south-eastern South America. 



The relationships of this genus are somewhat obscure, but it may conveniently 

 be placed near Tephnnectcs, with which it agrees in the bands of small teeth and 

 unsealed dorsal and anal rays. It may be readily distinguished, however, by the 

 absence of a curve in the lateral line, the more anterior origin of the dorsal fin, ami 

 by the simple median fin-rays, long, slender gill-rakers, etc. 



I, THYSANOPSETTA NARESI, Gunther. 



Ihysniwpsetta narcsi. Gunther, 1880, Shore Fishes " Challenger ", p. 22. pi. .xi, fig. \ : Dellin, 1901, 

 Rev. chil. Hist. Xat., iv, (1900), p. 104 ; DoUo, 1004, Res. Voy. " Belgica ", Zool., Trass., p. li , 

 Xorman, 1030, " Discovery " Reports, ii, p. 358. 



Depth of body z\ to 2\ in the length, length of head 4 to 5. Upper profile of head 

 generally a little notched in front of eyes. Snout shorter than eye, diameter of 

 which is 3 to 3I in length of head and more than twice the interorbital width ; upper 

 eve a little in advance of lower, and close to edge of head. Maxillary extending to 

 below middle of eye or not quite as far, length a little more than 1 in that of head ; 

 lower jaw scarcely projecting, if to nearly 2 in head. 20 to 23 gill-rakers on lower 

 part of anterior arch. 67 to 72 scales in lateral line. Dorsal 84-90. Anal 61-66 ; 

 first interha;mal spine not projecting. Pectoral of ocular side with 9 or 10 rays, 

 length about \ that of head. Pelvics 6. Caudal with 15 simple rays, rounded ; 

 caudal peduncle short. BrownLsh or greyish, mottled and spotted with darker, and 



' I am informed by Prof. I.. Roule and Mr. P. Chabanaud that the types of lishes described by 

 l.arepcde are not now to be found in the collections of the Pans Museum. 



