854 PROCEEDINGS OF THE NATIONAL MUSEUM. 



30. ZACCO SIEBOLDI (Schlegel). 



Leuciscus sieboldii ScnLEciEi,, Fauna Japonica, Poiss., 1846, p. 2]1, \A. ci, fig. 



Nagasaki. 

 Opmriirhthi/sftieholdiiGvNTaEii, Cat. Fish., YII,18ti8, p. 295 (cojiied). — SauvagbJ 



Bull. 80c. Philom., 1883, p. 5; Lake Biwa. 



Iload 4; depth 3|; D. Ill, 7; A. Ill, 10; P. 1, 11; V. D; scales 61 

 in the hiteral line; 13 scales between the orioin of the dorsal and| 

 the lateral line, and 5 between the latter and the middle of the belly| 

 phai'vnj^eal teeth 4, 1, 1 — 1, 4, 4; width of head If in its length; snoul 

 3i in head; eye 4f ; interorbital space 2i; pectoral li; ventral If. 



Body moderately elongate and compressed. Head jwinted and com^ 

 pressed; snout somewhat conical, pointed, but not projecting-; e}'^ 

 rather small, anterior and superior; mouth very oblique, the jawi^ 

 moderatel}'^ thin and about equal, the maxillary protractile and reachr 

 ing ])()steriorly almost to the anterior margin of the eye; no barbels; 

 pharj'ugeal teeth without grinding surface and slightly hooked; nos-^ 

 trils close together, on the sides of the snout, and nearer the eye thai 

 the tip of former; interorbital space l)road and very slightly convex.1 

 Gill-rakers short and pointed; pseudobranchiio present. Intestine 

 short and with few turns. Peritoneum black. 



Scales small, cycloid and somewhat imbricated upon the sides; pec^ 

 torals with a short, fleshy flap; ventrals with a small, scaly flap. 



Origin of dorsal midway between tip of snout and base of caudal, 

 when depressf'd reaching beyond the origin of the anal, and its base 2 

 in h(>ad; anal inserted a little nearer the tip of the pectoral than the 

 base of caudal, and the base of the tin 1^ in head; caudal deeply 

 emarginate. the l()))es pointed; pectorals moderate, reaching a])Out 

 two-tliirds the distance to origin of ventrals; ventrals inserted before 

 origin of dorsal, bioad and bluntly rounded, and reaching three- 

 fourths tlie space to origin of anal. 



Caudal peduncle about equtd to ventrals, and its least depth ab lut 

 two-thirds their length. Lateral line strongly decurved, continuous, 

 and i-unning along the lower part of caudal peduncle. 



Color in alcohol, dark brown above, pale or Avhitish l^eloAv; a dis- 

 tinct median, longitudinal, dark, brownish- black band, becoming 

 broad posteriorly, and continuing to the base of the caudal; dorsal 

 grayish with a blackish strc^ak l)etween each pair of rays, forming a 

 broad band across the fin, the upper edge whitish; caudal grayish, the 

 edges dark: anal pale, with gi'ayish black luarkings between the rays; 

 pectorals :ind ventrals pale, tinged with grayish. 



Length, 5^^ inches. 



This description from an adult breeding male from Lake Biwa at 

 Matsubara. 



Of this species we have many specimens from Lake Biwa at Matsu- 

 bara, the Chikugo River at Kurume, near Nagoya in Owari, Kibami 



