414 Memoir Sears Foundation for Marine Research 



anteriorly, the ventral outline somewhat more strongly convex. Caudal peduncle 

 scarcely as long as deep, its depth definitely less than half of greatest depth of body, 

 1. 55-1. 95 in head. 



Scales closely adherent, thin, almost circular, with even margin and with a 

 prominent, nearly complete vertical groove provided with i —3 horizontal branches on 



Figure 102. Rhinosardinia serrata, 63 mm TL, 47 mm SL, Morawhanna, British Guiana, cotype, USNM 

 66284. Drawn by Ann S. Green. 



each side; scales extending well out on caudal fin. Ventral scutes well developed, 

 especially the posterior ones, each with a prominent spine, 16 in advance of pelvic fins 

 and II — 13 behind them. 



Head rather short and deep, its length 4.25—5.1 in SL, its depth at vertical from 



crossgroove at occiput 4.65—4.9. Snout definitely 

 shorter than eye, 4.6-5.5 In head. Eye 3.0—3.8. In- 

 terorbital moderately narrow, 4.1-5.25 in head. 

 Cheek longer than deep. Mouth strongly oblique. 

 Maxillary broadly rounded posteriorly, reaching 

 nearly or quite below anterior margin of pupil, 2.1 — 

 2.5 In head. Mandible projecting moderately, Its 

 margin within mouth rising strongly, forming a 

 broadly rounded obtuse angle, 2.15—2.6 In head. 

 Gill rakers slender, close-set, very difficult to count, 

 approximately half as long as eye, about 35—40 on 

 lower limb. Teeth all minute, present on mandible 

 anteriorly and on palatines, pterygoids, and tongue, 

 but absent on maxillary, premaxillary, and vomer. 

 YicMvxioT,. Rhinosardinia serrata\iez.A DoRSAL fin well developed, rather high anteri- 



showne spine near end of maxillary, , . . . , . ,. 



,- • ■ T7.- r» u orlv, Its margm concave, its longest rays exceeding 



from specimen m rig. 102. Drawn by -" o ' to / ft 



Ann S. Green. the length of base, about as long as head, reaching far 



