40 ANNALS OF TEE QUEENSLAND MUSEUM. 
one fourth less than the head and trunk. This would naturalh 
suggest Carcharias hrachyurus Griinther, but my species differs from 
that in the short and broadly-rounded snout, the absence of a notch 
on the outer margin of the upper teeth, the absence of serrature in 
the lower teeth, the more anterior position of the pectoral fin, and 
the abnormal shortness of the space between the vent and the base 
of the caudal. In his description of C. hrachyurus Dr. Grunther 
makes no mention of this last character, and it is therefore to be 
inferred that the shortness of the caudal fin (not that of the tail) 
suggested the name to him. 
DASYBATIDiE. 
MYLIOBATIS HAMLYNI sp. nov. 
PURPLE BULL RAY. 
Length of disk* 185 in its width. Length of headf 2*75, of 
snout 4*75, width of interocular region 3, length of ventral 4 in 
length of disk. Width of mouth 1*5, diameter of eye 2*66, inter- 
nasal width 17 in length of snout. 
Greatest width of disk slightly behind the front margin of the 
abdominal region, its anterior and posterior borders gently undu- 
lous, the outer angle obtusely pointed and bent conspicuously back- 
wards. Tip of snout broadly rounded ; internasal frenum smooth ; 
hinder border of nasal flap truncate and coarsely fringed, the tips 
of the fringes lobate ; anterior angle of nostril nearer to middle of 
flap than to tip of snout. Upper jaw with 6, lower with 9, series 
of dental plates, each consisting of 7 teeth, a wide transverse 
median, which gradually increasing in width from the front, and 3 
small laterals directed outwards and backwards, and of equal size 
throughout. In the upper jaw the first median is as wide as, the 
last 2 2 times the 3 lateral teeth ; in the lower the first is half as 
wide as, the third as wide as, and the last twice as wide as the 
lateral 3, fifth median tooth of lower jaw 2*6 times as wide as long. 
Eye small, 24 in the feebly concave interorbitalj width, which is 
* From tip of snout to posterior angle of vent. 
fFrom tip of snout to first gill-opening. 
J As distinguished from "interocular,"' the width of which is 415 times the 
eye-diameter. 
