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Show 1893.] REPTILES A N D BATRACHIANS P R O M BORNEO. 527 A. Beak formed of two pieces, an upper and a lower, feebly denticulate, not ribbed ; lower lip not fringed. l 3 3 a. Series of labial teeth r j , B. jerboa. 3 3 5 5 b. Series of labial teeth B.latopalmata. 2 3 8 8 c. Series of labial teeth r B. cavitympanum. 4 B. Beak formed of three or four pieces, toothed, ribbed on its outer surface ; lower lip with a fringe of papillae a. Lower mandible formed of a single piece B. natatrix. b. Lower mandible formed of two pieces, like the upper B. whiteheadi. RHACOPHORUS OTILOPHUS. (Plate XLIV.) Vomerine teeth in two small oblique series close to the inner anterior angle of the choana?, which are exceedingly large. Head much depressed, large, a little broader than long; supratemporal region roofed over by rugose dermo-ossitication; frontoparietals rugose; a strong, spinose, bony crest above the tympanum; a spine at the angle of the jaws ; snout pointed, a little longer than the diameter of the orbit; nostrils close to the tip of the snout; canthus rostralis sharp, loreal region deeply concave ; forehead concave; interorbital space a little broader than the upper eyelid ; tympanum nearly as large as the eye. Fingers long, with rudimentary web, the tips dilated into rather large disks; toes two-thirds webbed, disks smaller than those of fingers. The tibio-tarsal articulation reaches between tbe eye and the nostril. Skin of back finely, of belly and lower surface of thighs coarsely granulate ; heel with a small triangular dermal appendage. Pale olive above, with dark grey spots and longitudinal streaks, much as in the Quadrilineatus-variety of R. leucomystax ; hind limbs with dark cross-bars, which are of an intense black and close together on the concealed surfaces of the hind limb. Male with internal vocal sacs. From snout to vent 80 millim. A single male specimen from Bongon, N . Borneo (Everett). This is a most remarkable form, allied to R. leucomystax but with the cranial dermo-ossification carried considerably farther, and reproducing pretty nearly the stage reached in the genus Bufo by B. typhonius, in the genus Hyla by H. lichenata, in the genus Nototrema by N. oviferum. I am fortunately again able to supplement the description of a new Frog with that of its larva, several specimens at all the middle and later stages of development having been collected by Mr. Everett in the same locality as the adult. Length of body once and a half to once and two-thirds its width, |