. Bulletin of the British Museum (Natural History). Zoology . 174 P. J. P. WHITEHEAD. Specimens. a. 2 fishes, 131-1-180-0 mm , Trinidad, coll. Guppy, BMNH b. 1 fish, 150-0 mm , Calamav Sta. 671, UNDP/FAO Caribb. Fish. Devel. Project, off Morawhan- na, Guyana, 8°45'N : 59°i5'W, at 19-5-20-5 fathoms, 25 : 1 : 1959, coll. L. J. K. Klein, ZMA c. 1 fish, n6-omm , as above, off Corantijn river, 6°i5' N : 56°45' W, at 11-11-5 fathoms, 26 : 3 : 1969, coll L. J. K. Klein, ZMA d. 1 fish, 144-6 mm , Guyana, coll. Scrivener, BMNH e
. Bulletin of the British Museum (Natural History). Zoology . 174 P. J. P. WHITEHEAD. Specimens. a. 2 fishes, 131-1-180-0 mm , Trinidad, coll. Guppy, BMNH b. 1 fish, 150-0 mm , Calamav Sta. 671, UNDP/FAO Caribb. Fish. Devel. Project, off Morawhan- na, Guyana, 8°45'N : 59°i5'W, at 19-5-20-5 fathoms, 25 : 1 : 1959, coll. L. J. K. Klein, ZMA c. 1 fish, n6-omm , as above, off Corantijn river, 6°i5' N : 56°45' W, at 11-11-5 fathoms, 26 : 3 : 1969, coll L. J. K. Klein, ZMA d. 1 fish, 144-6 mm , Guyana, coll. Scrivener, BMNH e. 11 fishes, 31-9-45-3 mm , Matapica, Surinam, 8-13 : 1 : 1966, coll. G. F. Mees, RMNH 26298. /. 7 fishes, 34-5-50-0 and 70-6-81-7 mm , Suriname river at Resolutie plantation, 22 : 12 : 1942, coll. D. C. Geijskes, RMNH 26299. g. 4 fishes, 34-3-44-5 mm , Suriname river, 10 miles up from mouth, 11:2: 1954, con<- H. W. Lijding, RMNH 21491. h. 1 fish, 34-3 mm , mouth of Suriname river near Resolutie plantation, 22:12: 1942, coll. D. C. Geijkes, RMNH 23306 (ex jar no. 18387). i. 7 fishes, 35-6-47-5 mm , Demerara river mouth at Fort Groyne, Guyana, coll. R. Lowe (Mc- Connell), BMNH j. 2 fishes, 116-5-182-3 mm , Gulf of Paria, coll. H. H. Brown, USNM 123088. k. 1 fish, 151-0 mm , Calamav Sta. 88, off Surinam, 5°i5'N : 55°45y W, 22 : 6 : 1967, TABL 185826. Description. Based on 5 fishes, ii6-o-i8o-o mm , from Trinidad and Guyana (batches a-d above). 13-14, D iii 13, P i 14, V i 6, A iii 23 (), 24 (1), 25 (1), 0-3 rudimentary and 10-14 + I5~I8 and 0-2 rudimentary. In percentages of standard length : body depth 22-8-28-2 (larger fishes usually deeper), head length 23-5-25-1 ; snout length 3-5-4-9, eye diameter 4-8-6-8, cheek length 9-4-11-3 ; length of upper jaw 22-0-23-2, length of lower jaw 17-5-19-0 ; pectoral fin length 16-4-18-3, pelvic fin length 7-3-9-0, length of anal base 23-3- 27-3 ; pre-dorsal distance 55
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