NO. 1296. JAPANESE CH^TODONTID.E— JORDAN AND FOWLER. 519 



3. CYTTOPSIS Gill. 

 Cyttopsis Gill, Proc. Ac. Nat. Sci. Phila., 1862, p. 126 {roseus); no description. 



Body ovate, mvich compressed, with rudimentary scales; mouth 

 rather small, the upper jaws extremely protractile; teeth small on 

 jaws and vomer; preopercle entire; supraorbital ridges serrated; gill 

 rakers ver}- short; dorsal spines strong, not filamentous; ventral rays 

 I, 7. Anal with two short spines more or less coalescent into a knife- 

 like spine; knife-like spines on the median line between ventral tins 

 and vent; spinous scales at base of soft dorsal and anal very small 

 or obsolete, not shield-like, about one for each ray, none at base of 

 spinous dorsal. Silvery fishes of the open seas, differing from Zeus 

 in the absence of bony plates, and from Cyttas in having knife-like 

 spines between ventrals and anal. 



{cyttus^ KVTTog name of an unknown fish; oz/'i?, appearance.) 



3. CYTTOPSIS ITEA Jordan and Fowler, new species. 



Head [2i];^ depth [2i].^ D. VII, ;^>0; A. 1, 30; P. 14; V. I, 9; 

 scales 82. Body deep, compressed, and covered with small cycloid 

 scales; a series of bony tubercles forming a ridge or keel, and covered 

 with thin skin, along the bases of the soft dorsal and anal, and about 

 equal in number to the fin rays; along the abdomen, from the gill- 

 opening to the anus, a single series of bucklers, 7 in number, the last 

 three being very large, and each with a single backwardly directed 

 spine; region between and in front of the ventrals flattened and broad, 

 anteriorly forming an angle just behind the gill-opening, which is 

 furnished with several small denticles; all the bucklers are smooth 

 and without stria?. Head deep, the upper profile of the snout and 

 space between the eyes and origin of the dorsal concave; eye very 

 large and high in the head [2 in the snout. If in maxillarv, and 3^ in 

 the head];' mouth large and deep, the maxillary Inroad distally, equal 

 to one-half the eye; lips very broad and thin, the width of the upper 

 equal to the width of the maxillary; teeth small, fine, and in broad 

 bands in the jaws, those above very broad; nostrils close together, 

 superior and directly in front of the eye, the anterior rounded and the 

 posterior a slit twice as long; above the ej^es a series of anteriorl}" 

 directed small denticles on each side of the head; top of the head with 

 some of the bones striated and covered with thin skin; dentaries with 

 2 small spines at the symphysis below; edge of the preopercle ver}'' 

 long and oblique, the angle exceedingly obtuse and rounded; inter- 

 orbital space concave and equal to one-half the eye. Gill-opening very 

 huge; branchiostegal rays, 7; gill rakers short and stumpy, 11 in 

 number; no slit behind the fourth gill arch. 



Origin of the spinous dorsal behind the gill-opening-, the spines 



^Tlie brackets indicate that such measurements, etc., as are given are not satisfac- 

 tory, owing to the distorted snout of this specimen. 



