Knowledge of the Crenilahri. 447 



both extremities to centre ; head occupying about one-fourth of en- 

 tire length ; jaws equal ; mouth small ; lips double, much resemb- 

 ling those of Labrus maculatus, Bl. ; teeth strong, rounded or truncat- 

 ed at the summits, not serrated, a single row of twelve, rather uni- 

 form in size in the lower jaw ; two rows at the interior part of up- 

 per jaw, those of the outer row the larger, and seven in number, ex- 

 ceeding the teeth of the lower jaw in size, eyes large, more than 

 their diameter distant from the snout, their distance from each 

 other equal to their diameter ; a row of pores round the eyes, and 

 some on the top of the head ; pre-opercle somewhat rounded at the 

 base, ascending rather obliquely, strongly serrated, the denticulations 

 extending half-way along its base, covered with small scales ; oper- 

 cle somewhat triangular, covered with large scales ; scales on the 

 body very large, smooth, and roundish at their free margins, three 

 rows above lateral line, nine below it ; lateral line for two-thirds an- 

 teriorly placed high, at one-fourth of the depth, and the precise form 

 of dorsal profile ; ventral central ; dorsal fin commencing at one-fourth 

 of the entire length from snout, and continuing to near the tail, end- 

 ing almost in a line with the anal fin, first ray very short, but they 

 gradually increase to the twenty-fourth, which is longest, a mem- 

 branous filament near the point of each spinous ray ; pectoral fin two- 

 thirds the length of head, originating in the same line with the dor- 

 sal fin ; ventral fin beginning at about one-third of the entire length 

 from the head, ventral scale about half the length of ventral fin ; 

 anal fin originating nearly in a line with the fifteenth spinous ray of 

 dorsal fin, and like it, when laid against the body, reaching to the 

 outer short rays of the caudal fin, the dorsal rather exceeding the anal 

 in length ; caudal fin obscurely rounded, and covered with scales at 

 the base for one-fourth of its length ; scales of the body concealing 

 the base of the dorsal and anal fins, but none on the fins. 



Having had an opportunity in the present month (October 1837>) 

 of looking over the collection of fishes obtained on the coasts of the 

 counties of Londonderry and Antrim, during the progress of the 

 Ordnance Survey, I had the satisfaction of seeing three specimens 

 of the C. microstoma, which were liberally oflFered for my use by 

 Captain Portlock, R. E., who at the same time suggested, that, if de- 

 sirable, a drawing of one of them should be made by the gentleman 

 attached as draughtsman to the Survey. To this kindness I am in- 

 debted for the drawing which accompanies the paper, the original 



ly arched, and from the centre slope equally to each extremity ; in these the 

 ventral profile is rather less convex than in the former. The difference is pro- 

 bably sexual,. 



