r>f the Genus rellonula c&c. 19? 



Synojisls of ihe Genera. 



I. ALduminal scutes sharply keeled ; prfeniaxillary teeth rather strong. 



A. Lower jaw not or but little projecting; anterior maudibuhiry 



teeth enlarged, but no strong canines in either jaw. 



1. D. 16-18, above or just behind ]ielvics. A. 16-21. Scales 



abjut 45/11-1.5. Vertebrae 42-43. Supramaxillary large. 



] . Pidlonula. 



2. D. 12-14, above interspace between pelvics and anal. 



A. 20-21. Scales 3.S/8. Yertebr* 43 2. PoncUothrism. 



A. 21-25. Scales 38-42/10-12. Vertebra 39-40. . S. Microthrissa. 



3. D. 13-14, above pelvics. A. 17-18, far bebind dorsal. Scales 



40-44/10. Vertebrae 42. Supramaxillary small. 



4. Potamothrissn. 



B. Lower jaw strongly projecting. 

 Pniemaxillaries with an inner seiies of 2 or 3 strong 



canine-like teeth on each side ; anterior teeth 



of lower jaw enlarged 5. Cynothrissa. 



Prjiemaxillary teeth uniserial, with a canine on each 

 side; lower jaw with a pair of strong anterior 

 canines G. Odaxothrissa. 



II. Abdominal scutes in front of pelvic fins feebly keeled ; prre- 



maxillary teeth small. 



Maxillary narrow proximally and expanded distally ; 



tongue and palate toothless 7. Stolothrism, 



Maxillary broad throughout its length ; a patch of 



teeth on each palatine and a jtrip on tongue . . 8. LiiuiiotJirissa. 



1. Pellonula, G Until. 18G8. 



Cat. Fish. vii. p. 452. 



Form elongafe, cnnipvtssed; abdomen sliarp-edgcd. Mouth 

 moderate, terniiiuil, with the h)wer jaw a little projecting ; 

 upper jaw without median notch; maxillary ot a nairow 

 proximal and an expanded distal part ; in tront of tije narrow 

 part a ligatmnt ruii.s from tiie end of the pra^maxillary to the 

 broad part of the tnaxillary ; a single well-developed supra- 

 maxillary. Teeth in jaws njiiserial, conical, acute ; prse- 

 maxillary teeth rather strong, unequal, without well-marked 

 canines; mandibulary teeth enlarged anteriorly; maxillary 

 teeth minute ; a patch of conical teeth on each palatine ; an 

 elongate patch of small teeth on tongue. 6 branchiostegals. 

 Scales with entire edges, moderate, in a longitudinal series 

 one to each myotome ; ventral scutes sharply keeled and 

 acutely pointed, commencing on or behind the thoracic keel 

 formed by the iiypocoiacoids. Dorsal of 16-18 rays, anal of 

 16-21. Pelvics 8-rayed, below or a little in advance of 

 dorsal. Vertebrae 42 or 43. A bluish-silvery lateral band. 



