of the G'e/JW5 Pelionula c&(?. 199 



Syno-psis of the Genera, 



I. A-Ldominal scutes sharply keeled ; praemaxillary teeth rather strong. 



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



teeth enlarged, but no strong canines in either jaw. 



1. \). 16-18, above or just behind ),elvics, A. 16-21. Scales 



about 45/11-15. Vertebrae 42-43. Supramaxillarv large. 



1 . PcUonula. 



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



A. 20-21. Scales 8.3/8. Vertebrae 43 2. Pceeilothrissa. 



A. 21-25. Scales 38-42,10-12. Vertebrae 39-40. . 3. Microthrissa. 



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



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



4. Potamotkrissa. 



B. liower jaw strongly projecting. 

 PrtTmaxillaries with an inner seiies of 2 or 3 strong 



canine-like teeth on each side ; anteiior teeth 



of l')wer jaw enlarged 5. Cynoihrissa. 



Praeniaxillary teeth uni.«erial, with a canine on each 

 side; lower jaw with a pair of strong anterior 

 canines , 6. Odaxothrissa. 



II. Abdominal scutes in front of p.elvic fins feebly keeled : praa- 



maxillar}' teeth small. 



Jlaxillarj' narrow proxinially and expanded dLstally ; 



tongue and pulate toothless 7. Slolothrissa. 



Maxillary broad throughout its length ; a patch of 



teeth on each palatine and a strip on tongue . . 8. LimuoOirUsa. 



1. Pkllonula, G until. 1S68. 



Cat. Fish. vii. p. 452. 



Form elongate, compressetl; abdomen sharp-edged. Month 

 moderate, terminal, with the lower jaw a little projecting ; 

 upper jaw Avithont median notch; maxillary ot a narrow 

 proximal and an expanded distal part ; in Iront of tijO narrow 

 part a ligament runs from tlie end oi' the pra^maxillary to the 

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

 maxillary. Teeth in jaws uni.serial, conical, acute; prse- 

 maxillary teeth rather stiong, unequal, without well-marked 

 canines; niandibiilary teeth enlarged anteriorly; maxillary 

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

 elongate patch of small teeth on tongue. 6 Iranchiostegals. 

 Scales with entire edges, moderate, in a longitudinal series 

 one to each myotome ; ventral scutes sliar|.iiy keeled and 

 acutely pointed, commencing on or behind the thoracic keel 

 fornied by the hypocoracoids. Dorsal of 16-18 rays, anal of 

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

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



