. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. EcuADOREAx Glandulocaudixe Fishes • Robeits 505 urohyal. .5 mm branchiostegal rays 1-4 Figure 17. lotabrycon proecox. Lateral view of left half of fiyoid arch (minus basihyol and interhyal) and urohyal (offset) ( specimen). thfsc specimens are r(^lati\(>ly cMiiph', an indication that the\- had stopped feeding. The stomach contents of lotabrycon have not been investigated, in order to conserve specimens. OSTEOLOGY Figures 4-26; Tables 1, 2 Osteoloiiical study material. This account is based on the following m
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. EcuADOREAx Glandulocaudixe Fishes • Robeits 505 urohyal. .5 mm branchiostegal rays 1-4 Figure 17. lotabrycon proecox. Lateral view of left half of fiyoid arch (minus basihyol and interhyal) and urohyal (offset) ( specimen). thfsc specimens are r(^lati\(>ly cMiiph', an indication that the\- had stopped feeding. The stomach contents of lotabrycon have not been investigated, in order to conserve specimens. OSTEOLOGY Figures 4-26; Tables 1, 2 Osteoloiiical study material. This account is based on the following material: lotahiycon praccox: MCZ 48659, 3 paratypes: immature; female; male. Phenacohrycon henni: MCZ 48661, 3 specimens, mm. Landonia latidens: MCZ 48664, 5 specimens, mm. Brijconamericus brevirostris: MCZ 48665, 2 specimens, and mm, Rio Vinces at Mnces, 5 November 1971. Bryconamericus scleroparius: MCZ 48666, 5 specimens, mm, Arroyo Campo Triste, tributar\- to Rio Blanco, Esmeraldas basin, 27 km XW of town of Santo Domingo, 20 October 1971. Asiyanax festae: MCZ 48667, 3 specimens, mm, Rio \'inces at Vinces, 5 November 1971. Brycon dentex: MCZ 48668, 2 specimens, and mm, Rio Esmeraldas 35 km upstream from cit>' of Esmeraldas, 21 October 1971. Cranium (Figs. 7-10). Crania of Phena- cobrycon (Fig. 8) and Landonia (Figs. 9, 10) are similar to each other except in the ethmoid region. Both lack rhinosphenoids and tlie sti'ong \entroposteriorIy directed pterotic process found in Brycon, but other- wise differ little from that genus. The posterior half of the cranium of Landonia is slight!)' foreshortened and deeper, as e\'idenced in the shapes of tlie parietal, pterotic, and prootic bones, and in the approximation of the parietal branch of the frontal laterosensory canal to the parietal later()\' canal. In Phena- cobrycon th(> ethmoid region is similar to that in Brycon in that the v
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