262 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



14. TRACHIDERMUS Heckel. 



Trachidermufs Heckel, Ann. AViener Mus. , II, 1840, ]). 159 (fasciatus); not 

 Trachydernid, the correct orthography, used by Latreille in 1929 for a genus 

 of Coleoptera. 



Centriderinichihys Riciiakdson, Voyage Sulphur, Fishes, 1846, p. 78 (an-satiix). 



This g-enu.s dili'er.s from C'ottu.s chiefiy in having a much depressed 

 head bearing- ridges covered by a moderately thick skin; 2 ridges on 

 each side of top of head from behind eye, diverging backward; a 

 ridge on opercle, and a prominent one on suborbital stay; spine at 

 angle of preopercle ^'eiy nuich hooked and having the gill iueml)rane 

 more narrowly connected to isthnuis. It has teeth on jaws, vomer, 

 and palatines; branchiostegals (>; no slit behind last gill arch; origin of 

 anal behind middle of entire length, and skin usually with prickles; 

 lower pectoral rays simple. Ventral rays I, -i. Mountain streams of 

 southern Japan, China, and the Philip])ines. 



{rpaxvs, rough: SefJi-ia, skin.) 



15. TRACHIDERMUS ANSATUS (Richardson.) 

 YAMA-NO KAMI (MOUNTAIN WITCH); AYUKAKE. 



11 Trachidermui^ fasciatus Heckel, Ann. A\'iener Mus., II, 1840, p. 160, pi. ix, 



figs. 1, 2; Philippines. 

 V.Centridermichthys fasciatus Gunther, Cat. Fish., II, 1860, p. 170, copied. — 



IsHiKAWA, Prel. Cat., 1897, p. 48; Kii, Shikoku, Tokushinia. 

 Cottus uncinatus Schlegel, Fauna Japonica, Poiss., 1843, p. 38; "Mersdu Japon" 



probably from Chikugo River, northeast of Nagasaki (not Cottus uucinatus 



of Reinhardt, 1833, a species of Icelus. ) 

 Centridermichthys ansatus Richardson, Voyage of Sulphur, Fishes, 1844, p. 74, 



pi. Liv, figs. 6-10; Woo Sung, mouth of the Yangtze. 



Head 2i to 2f in length without caudal; depth 5i; dorsal VIlI-18 

 or 19; anal 15 to 18;« e3^e 5i to 5i in head; interorbital width 6^ to 7; 



maxillary 2J. 



Head and anterior part of body depressed; the head is nearly twice 

 as wide as deep. Teeth in moderate bands on mandible, vomer, and 

 sides of premaxillary, becoming wide on front of premaxillary ; in a 

 narrow line pointed at each end on palatines. Lower jaw included; 

 maxillary reaching to posterior margin of eye. Interorbital rather 

 wide, concave, and without ridges, continuous with a wide concave 

 area on top of head ])etween ridge from eyes, superorbital rim ver}^ 

 much widened posteriori}'. From each eye a pair of ridges run back- 

 ward which are covered by moderately thick skin; the inner ridge 

 diverges from the outer one toward its fellow of the opposite side and, 

 in specimens 8 cm. and under in length, ends in a small ])lunt spine at 



«Fin formulaj of 32 specimens: 22 specimens have 19 dorsal rays; 10 specimens 

 have 18 dorsal rays; 20 specimens have 17 anal rays; 11 specimens have 18 anal rays; 

 1 specimen has 15 anal rays. 



