196 Annals of the Carnegie Museum. 



the anal minute, not reaching the caudal; scales minute; lateral line 

 nearly straight, continuous. 

 Distrihiition: Formosa. 



15. Hemimyzon formosanus (Boulenger). 



1894. Homaloptera formosanus Boulenger, Ann. Mag. Nat. Hist., Ser. 6, XIV, 



p. 463; Central Formosa. 

 .1911. Hemimyzon formosanus Regan, Ann. Mag. Nat. Hist. (8), VHI, p. 32; 

 Formosa (after Boulenger). 



Head 4.25 in length; depth 6 in length and 1.5 in width; D. 2, 7; 

 A. I, 5; P. 22; V. 15; width of head i in its length; eye 5.66 in head; 

 snout 1. 71; interorbital space 2.3; pectoral 1.33 times as long as head; 

 ventral very slightly shorter than the pectoral; scales about 70 in the 

 lateral line. 



Body strongly depressed, low, tail compressed, middle part of body 

 broadest, belly and throat flat; head flattened, disc-shaped; gill- 

 opening rather large; snout broad, with rounded sharp anterior margin; 

 interorbital space rather flat; mouth inferior, transverse, crescent- 

 shaped; upper lip fringed with a fleshy inner fold; lower jaw shorter 

 than the upper; lower lip with a smooth horny inner fold, its anterior 

 margin sharp; six barbels, short, subequal, two pairs on the lower 

 extremity of snout and the other at the angles of mouth; eyes small, 

 superior and posterior, considerably nearer the angle of operculum 

 than tip of snout; nostrils close together, superior, in front of eye, 

 anterior nostril in a short tube. 



Origin of the dorsal very slightly nearer tip of snout than base of 

 caudal, above anterior third of the base of ventral; pectoral fin sub- 

 horizontal, with eleven simple rays, outer margin broadly rounded, 

 extending beyond the origin of ventral; ventral fins horizontal, flat, 

 distinctly separated, with four simple rays, not reaching the anus; the 

 anal very small, entirely behind the donsal; caudal fin forked, the 

 tip of each lobe pointed, lower lobe slightly longer than the upper. 



Scales minute; belly and throat naked; lateral line nearly straight, 

 slightly upcurved above the pectoral, extending along the middle of 

 the sides. 



Color in alcohol dark gray above, lower surface yellowish white; 

 caudal fin with four dark brown cross-bars; other fins pro\'ided with 

 a number of dark elongate spots. 



Total length 64 mm. 



