. Bulletin of the British Museum (Natural History). Zoology . Supplement.. 176 P. J. P. WHITEHEAD o. Fig. 69. Gillrakers and jaw teeth in Lycengraulis grossidens, showing less developed juvenile jaw teeth than in L. batesii (cf. Fig. 65). a. Trinidad fish, 180-0 mm S.L., BMNH 1935.9.13.8-9. b. Juvenile, 34-3 mm S.L., RMNH 23306. c. Adult (as a above). Operculum fairly narrow, its width at midpoint three times in its height, its lower margin at an angle of about 45 degrees to the horizontal, its hind margin evenly rounded or with a slight angle at midpoint, a small crescent of gill opening left
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. Bulletin of the British Museum (Natural History). Zoology . Supplement.. 176 P. J. P. WHITEHEAD o. Fig. 69. Gillrakers and jaw teeth in Lycengraulis grossidens, showing less developed juvenile jaw teeth than in L. batesii (cf. Fig. 65). a. Trinidad fish, 180-0 mm S.L., BMNH 1935.9.13.8-9. b. Juvenile, 34-3 mm S.L., RMNH 23306. c. Adult (as a above). Operculum fairly narrow, its width at midpoint three times in its height, its lower margin at an angle of about 45 degrees to the horizontal, its hind margin evenly rounded or with a slight angle at midpoint, a small crescent of gill opening left exposed ; sub-operculum about 1-5 times as long as deep, posterior margin evenly rounded. Length of cheek greater than snout plus eye, the eye contained just over twice in cheek in larger specimens but only about 1-5 times in the smallest fish (ii6-o mm S.L.). Dorsal surface of head with a median ridge separating the supra-orbital canals, the latter covered by thick adipose tissue but beneath this bridged by two bony struts, the posterior oblique and above vertical from posterior eye border. Frontals tips separated in the midline posteriorly, exposing a pair of triangular posterior frontal fontanelles separated by a slender anterior projection of the supra-occipital, the fontanelles quarter eye diameter. Pterotic bulla, if present, not discernible on floor of pre-epiotic fossa.. 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 work.. British Museum (Natural History). London : BM(NH)