376 



fornier. Its pharyngeal teeth are in two rows, viz. five inferior taller 

 ones, and two interior shorter ones, all incurved at the tips, and some 

 of thein distinctly denticulated on the iuner edge, others only obso- 

 letely so. 



Rays : — D. 10 ; A. 11, the lašt one deeply divided, and the front 

 one short and incumbent ; V. 9 ; P. 18 ; C. 19. 



In general form this fish resembles the Leuciscus Baldneri more 

 nearly than it does any of the other species figured in the ' Histoire 

 des Poissons,' but the head is a little longer, and the snout does not 

 bulge out at the nostrils ; the lašt ray of the dorsal also stands a 

 little before the anus, and the anai does not occupy so much space 

 as in L. Baldneri. Of the figures given by Yarrell, it has most like- 

 ness to the Graining or L. Lancastriensis, 



Length of the head coutained four times in the length of the fish 

 up to the base of the caudal, or four and a half times in the length 

 when that fin is included. The form of the head is conical. The 

 eye approaches the upper profile, and its diameter measures about a 

 fourth of the length of the head ; it is situated a little more tlian a 

 diameter froni the tip of the snout, and nearly two diameters from 

 the extreme edge of the gill-cover. Preorbitar subtriangular, with 

 its corners irregularly rounded off, and its orai border traversed by 

 a muciferous tube having short lateral branches. The remaiuder of 

 the suborbital chain unitas imperceptibly with the silvery integument 

 of the cheek, but is indicated by its muciferous tube skirting the 

 under curve of the orbit. When the head is allowed to dry, hovvever, 

 the second and third suborbitars are perceived to be very narrow, and 

 the fourth one much broader. 



The height of the body is about one-fifth of the totai length to 

 the tips of the caudal, or, more CKactl)', a fourth of the length up to 

 the end of the scales on that fin. It is a very little less than the 

 length of the head. The thickness of the fish is greatest at the nape, 

 which is much rounded, and is equal to half the greatest height of 

 the body. The back is more obtuse than the belly. Lateral line 

 decurved, running more than a third of the height from the rim of 

 the belly, and traced on forty-seven scales. There are seven rows 

 above the lateral line at the ventrals, and four below, making with 

 the one contributing to form the line, twelve in all. Of these, two 

 scales are below the upper ventral ray. There are about seventeen 

 short lines on the base of a scale, and twelve or fourteen longer ones 

 on the esposed disk, all radiating from one point. The concentric 

 lines of structure are crowded, but very evident. 



Appendix. 



Museum of Practical Geology, 

 Jermyn Street, 



November 27th, 1856. 

 My dear Sir Roderick, 



I hasten to give you the results obtained in the exami- 

 nation of waters vvhich were forvvarded to me by Mr. Reeks : — 



