. Bulletin of the Natural History Museum Zoology. 102 SIEBERT AND TJAKRAWIDJAJA. Fig. 3 Snout tubercles of: A. 5. heterorhynchos, MZB 8612, mm SI; B. S. holorhynchos, FMNH 68550, mm SI; C. S. endecarhapis, MZB 6092, mm SI. this species, which appears considerable. A photograph of a small, medium and large specimen is presented in Figure 2. Selected morphometric ratios, meristic information, and vertebral counts are reported in Tables 1-3. Head relatively long, with a comparatively small eye, increased head length due to an elongate, pointed snout with a well develope
. Bulletin of the Natural History Museum Zoology. 102 SIEBERT AND TJAKRAWIDJAJA. Fig. 3 Snout tubercles of: A. 5. heterorhynchos, MZB 8612, mm SI; B. S. holorhynchos, FMNH 68550, mm SI; C. S. endecarhapis, MZB 6092, mm SI. this species, which appears considerable. A photograph of a small, medium and large specimen is presented in Figure 2. Selected morphometric ratios, meristic information, and vertebral counts are reported in Tables 1-3. Head relatively long, with a comparatively small eye, increased head length due to an elongate, pointed snout with a well developed rostral fold (=rostral cap of Roberts, 1989) which is hypertrophied in support of heavy tuberculation. Snout divided by a deep horizontal cleft above 1st infraorbital bone (Io 1). Upper (ethmoidal) lobe consists of connective tissue outgrowth from front edge of mesethmoid, supports large tubercles; in dorsal view its anterior edge indented in midline to form left and right anterior lobes. Anterior extension of rostral cap also consists of a connective mass which supports anterior tubercles of snout. Two pairs of barbels present, anterior pair small, posterior pair longer, but hidden in a deep recess at corner of mouth. Mouth inferior, broad, C-shaped, usually a little wider than long (mean Mw:Ml = ; range = , SE = , n=32). Lower jaw equipped with an emergent, thin, flexible, extremely long cornified cutting edge which is much longer than posterior extent of upper and lower lips. Posterior tips of cutting edge of lower jaw extend behind a vertical line from middle of eye. Large, unicuspid, pyramidal tubercles, with 3-5 sides, present in and around rostral cleft (Fig. 3A). Tubercles also present around dorsal edges of upper lobe of snout formed by rostral cleft, on upper and lower interior surfaces of rostral cleft, between eye and nares, on upper half of Io 1, and over dorsal and anterior aspects of rostral cap. Large tubercles absent from dorsal surface of head
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