. Breviora. 197 BORNEAN FRESHWATER FISH Eye (Figs. 1, 2, 5). The eye is misshapen in all three speci- mens of EUopostoma. Figures 1, 2 and 5 depict its approximate shape. It presumably is oblong in live specimens, not perfectly round as in Vaillant's figures. Orbital rim free. Adipose eyelid absent. The combination of large eye and exceptionally large nostrils found in EUopostoma is unusual. The eye is relatively much smaller in Cobitidae and Kneriidae (in both of which orbital rim usually attached) with the exception of the minute kneriid Grasseichthys, which has relatively small olfactory or
. Breviora. 197 BORNEAN FRESHWATER FISH Eye (Figs. 1, 2, 5). The eye is misshapen in all three speci- mens of EUopostoma. Figures 1, 2 and 5 depict its approximate shape. It presumably is oblong in live specimens, not perfectly round as in Vaillant's figures. Orbital rim free. Adipose eyelid absent. The combination of large eye and exceptionally large nostrils found in EUopostoma is unusual. The eye is relatively much smaller in Cobitidae and Kneriidae (in both of which orbital rim usually attached) with the exception of the minute kneriid Grasseichthys, which has relatively small olfactory organs. Laterosensory canals (Figs. 1-3, 5). Laterosensory system with supraorbital, infraorbital, preopercular, temporal, occipital and lateral canals. Supraorbital canal enclosed in a superficial bony tube on frontal bone until anterior margin of eye, then continued unenclosed for a short distance before it is again en- closed by the tubular nasal bone, without ethmoidal commissure or medially-directed branches. Infraorbital canal enclosed in a superficial, segmented bony tube (the infraorbital series?), con- tinued anteriorly onto snout, where it turns upwards abruptly and terminates immediately anterior to nostrils. The appearance of the infraorbital canal is similar to that in Cobitidae (and Kneriidae?). Preopercular canal with two or three short lateral branches terminating in a small pore (Fig. 3). Occipital canal supraorbital canal supraorbital frontal extrascapular nasal. lateral ethmoid infraorbital canal temporal canal occipital canal temporal commissure supraoccipital posterior frontal fontanel parietal lateral canal supracleithrum Figure 5. Dorsal view cf head, based mainly on lectotype (camera lucida).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparat
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