MUSEUM OF COMPARATIVE ZOOLOGY. 235 
Differing from R. eglanteria, which it resembles in shape, in a somewhat 
shorter snout and in coloration. 
Disk, including ventrals, 9.5 ; width 9 ; tail from vent 9.6 ; and total length 
16.25 inches. 
Light yellowish brown, sprinkled with small spots of brown intermixed with 
others of white. On the base of each pectoral a little behind the shoulder 
girdle there is a transversely oblong spot of brown, half an inch in diameter, 
surrounded by a ring of small spots forming a sort of rosette, Uniform white 
beneath. Named for Lieut. Seth M. Ackley, U. S. N.,to whose energy and en- 
thusiasm we were indebted for much valuable assistance. 
Yucatan Banks. 
Raja ornata. 
Var. nov. R. Ackleyi. 
Disk, including the ventrals, little broader than long, anterior margins con- 
vex at the extremities of the pectorals ; tail depressed, becoming quite slender 
backward, with a narrow cutaneous fold on each side. Rostral angle obtuse. 
Snout not produced beyond the convex margins on each side of it. Rostral 
cartilage slender, acute. Mouth medium, moderately curved, width one and 
one third times in the distance from the end of the snout. Teeth small, smooth, 
in forty-four series in the upper jaw (young male) Eyes large, interorbital 
space more than three times in their distance from the end of the snout. Spi- 
racles smaller than the eye. Ventrals medium ; posterior portion elongate, 
anterior small. Dorsals small, separate. Hinder margin of pectorals rounded. 
A vertebral series of spines on back and tail ; one lateral series on each side of 
this on the back, and two on the tail; a series on each orbital ridge ; a single 
spine on the forehead between the eyes; a group of several above the end or 
the rostral cartilage ; a spine on each shoulder ; a group near each ventral on 
the hinder angle of the pectoral, and a group on the anterior extremity of the 
latter. Entire upper surface rough with small sharp asperities ; smooth below. 
Disk to end of ventrals 4.5, width 4, tail from vent 4.6, and total length 8 
inches. 
Light brownish, freckled with lighter, marked with scattered rosettes or 
groups of small spots of darker. One of these groups stands on the pectoral a 
little back of the shoulder, a couple near the hinder angle, and one opposite, or 
a little behind the spiracle. White beneath. Several spots on the tail ; one 
at the base of each dorsal. 
One specimen off Alligator Key, Florida ; 138 fathoms. 
Three specimens, Lat. 32? 24' N., Lon. 78? 44' W ; 142 fathoms. 
Of the latter, one has only the vertebral series of spines well developed ; an- 
other has the vertebral and. one lateral on each side ; and the third has the 
three series and scattered spines in the second lateral. One has a third dorsal 
considerably in advance of the usual pair, near the middle of the length of the 
tail. Tail extending behind the dorsals in a slender point. At present it 
