HYPNARCE. 303 



with two dorsals, a well-developed caudal and with lateral folds. Ventrals 

 large, united below the tail. Skin naked. 

 Coast of Peru. 



DiSCOPYGE TSCHUDII, 



Discopyge tschiidii Tschudi, 1845, Fauna Peruana, Pisces, p. 32, pi. 6; Dumjebil, 1865, Elasm., 521; 

 GtJNTH., 1870, Cat. fishes Brit, mus., 8, p. 454. 



Disk circular; tail less than half the total length. Mouth, eyes, and 

 spiracles in the anterior seventh of the total. Mouth small, protractile; teeth 

 bands narrow; teeth minute, flat, inner margins acute angled. Eyes small. 

 Spiracles much larger than the eyes and at a short distance backward, margins 

 without papillae or projections. Gill apertures small, hindmost two behind 

 the middle of the disk. Dorsals small, rounded, subequal; origin of first dorsal 

 slightly in front of the hind margin of the ventrals; second dorsal reaching little 

 beyond the origin of the caudal. Ventrals broad, rounded, united behind the 

 vent. Tail small, depressed, dermal folds prominent, posterior margin of caudal 

 convex, supracaudal portion of fin longer. 



Dusky reddish brown above, darker over the middle; dull whitish below. 



Specimen described about five and five eighths inches long taken between 

 Huacho and Chancay, Peru. 



Discopyge ommata. 



Discopyge ommata Jordan & Gilbert, 1890, Proc. U. S. nat. mus., 12, p. 151; Jord. & Everm., 1896, 

 Bull. 47, U. S. nat. mus., p. 78. 



Disk subcircular, Uttle wider than long. Snout broadly rounded. Eye 

 small. Spiracle close behind the eye, smaller, fringed with eight to ten papillae. 

 Anterior nasal valves confluent. Teeth flat, crown with an angle on inward edge. 

 Dorsals small, subequal, second narrower and higher, rounded. Ventrals large, 

 rounded, united below the tail. Tail shorter than the body cavity, a fold at 

 each side, caudal rounded. 



Brown, irregularly mottled and spotted with lighter and darker markings, 

 more distinct near margins of disk and tail; a large ocellate spot of blackish in 

 the centre of the disk. Dorsals and caudal pale marbled with darker brown. 



Coast of Panama. 



Hypnarce. 



Hypnos Dumeril, 1852, Rev. & mag. zool., p. 277. 

 Hypnarce Waite, 1902, Rec. Austr. mus., 4, p. 180. 



Disk longer than broad; preoral region short. Tail short, with two small 

 dorsals and a small caudal. Ventrals large, united. Mouth moderate, not 



