84 BRITISH FRESHWATER FISHES 



Eye small, its diameter less than one-fifth the length 

 of head ; fins small . . . . 7. inframundus 

 Eye large, its diameter not much less than one- 

 fourth the length of head ; fins rather large 



8. stnianensis 



B. Body very elongate, the greatest depth about 



one-sixth of the length . 9. gracilliinus 



II. Irish Species 



A. Snout conical or subconical ; lower jaw 

 pointed anteriorly, not included within 

 the upper ; anal fin with 7 to 9 branched 

 rays. 



I. Not more than 170 scales in a 

 longitudinal series ; maxillary ex- 

 tending a little beyond the eye in 

 males of 1 1 or 12 inches. 



a. 1 2 to 16 gill-rakers on the 

 lower part of the anterior 

 branchial arch. 



a. Snout subconical, de- 

 curved ; teeth feeble or 

 moderate. 



Depth of body 4 to 5 in the length ; least depth of 

 caudal peduncle about two-fifths the length of 

 head ; pectoral fin extending from one-half to 

 nearly three-quarters of the distance from its base 

 to the pelvics ; 138 to 168 scales in a longitudinal 

 series; 62 or 63 vertebrae . . . . 10. colli 



Depth of body 3 J to 4 in the length; least depth 

 of caudal peduncle one-half or nearly one-half 

 the length of head ; pectoral fin extending two- 

 thirds to nine-tenths of the distance from its 



