362 CYCLOSTOMATA. 



3. Petromyzon branchialis, Plate CLXXIX, figs. 2 and 3. 



Petromyzon planeri % Bloch, Ich. pi. lxxviii, f. 3, and Hist. Nat. p. 664, t. lxxviii, 

 f. 3 3 Bonnatei're, Ency. Ich. i, p. 2, pi. i, f . 4 ; Gmel. Linn. p. 1516 ; Turton, p. 110 ; 

 Bl. Schn. p. 532 ; Lacep. i, p. 30, pi. iii, f. 1 ; Blainv. F. Franc, ii, p. 8, pi. i, f. 3 ; 

 Jenyns, Manual, p. 522 ; Yarrell, Brit. Fish. (ed. 1) ii, p. 457, c. fig. (ed. 2) ii, 

 p. 607 (ed. 3) i, p. 19 ; Parnell, Wern. Mem. vii, p. 446 ; Nilss. Skand. Fauna, iv, 

 p. 747 ; Thompson, P. Z. S. 1837, p. 58, and Nat. Hist. Ireland, iv, p. 266 ; Selys- 

 Longc. F. Belg. p. 226 ; Kroyer, Damn. Fiske, iii, p. 1052, c. fig. ; Johnston, 

 Berwick. N. H. F. Club, 1838, i, p. 176 ; Heckel and Kner, S. W. Fisch. p. 382, 

 f. 204; Siebold, S. W. Fis. p. 375; Gronov. ed Gray, p. 2 ; Blarchard, Poiss. 

 Fran. p. 517, f. 138-149 ; Canestrini, Faun. Ital. Pesc. p. 31 ; Feddersen, Ich. 

 Dan. p. 95 ; Moreau, Poiss. de la France, iii, p. 606. 



Petromyzon sanguisuga, niger and septocuille, Lacep. ii, p. 101, iv, p. 667, 

 t. xv, f. 2. 



Petromyzon bicolor and plumbeus, Shaw, Zool. v, p. 263. 



Lampetra fiuviatilis et planeri, Gray, Chond. pp. 140, 141 ; White, Catal. 

 p. 144. 



Petromyzon branchialis, Lacep. i, p. 26, pi. ii, f. 1 ; Giinther, Catal. viii, p. 504 ; 

 Houghton, Brit. F. W. Fishes, p. 196, c. fig. ; Collett, Norges Fiske, p. 220 ; 

 Giglioli, Cat. Pesc. Ital. p. 55 ; Malm, Fauna, p. 636. 



Planer's lamprey, Couch, B^sh. Brit. Isles, iv, p. 402, pi. ccxlviii, f. 1. 



(Immature forms.) 



Lamproyen, Rondel. Pise. Fluv. p. 202. Lampetra cceca, Willugh. p. 107, 

 t. G3, f. 1 ; Bay, Synop. Pise. p. 36. Petromyzon, no. 3, Artedi, Synon. p. 90, and 

 Genera, p. 64 ; Gronov. Zooph. no. 160. Pride, Pennant, Brit. Zool. (Ed. 1776) 

 iii, p. 80, pi. viii (Ed. 1812) iii, p. 107, pi. x. 



Petromyzon branchialis, Linn, i, p. 394 ; Bl. 1. c. pi. lxxviii, f . 2, and Hist. Nat. 

 p. 662, t. lxxviii, f. 2 ; Bl. Schn. p. 532 ; Bonnaterre, 1. c. p. 1, pi. i, f . 3 ; Gmel. 

 Linn. p. 1515; Turton, p. 110; Gronov. ed Gray, p. 2. 



Petromyzon ruber, Lacep. ii, p. 99, pi i. 



Petromyzon lumbricalis, Pall. Zoo. Ross. -As. iii, p. 69. 



Petromyzon caecus, Couch, Mag. Nat. Hist, v, p. 23, f. 10. 



Ammocoztes branchialis, Cuv. Begne Anim. ; Nilss. Skand. Fauna, iv, p. 748 ; 

 Fleming, p. 164 ; Jenyns, p. 522 ; Parnell, 1. c. 447 ; Yarrell, 1. c. (ed. 1) ii, p. 459, 

 c. fig. (ed. 2) ii, p. 609 ; Templeton, M. N. Hist. 1837 (2) i, p. 413 ; Selys-Longc. 

 1. c. p. 227 ; White, Catal. p. 145 ; Swainson, Fishes, ii, p. 338 ; Kroyer, iii, 

 p. 1060, c. fig. ; Heckel and Kner, 1. c. p. 382, f. 204 ; Gray, Chondr. p. 145 ; 

 Thompson, Proc. Zool. Soc. 1835, p. 82 and Nat. Hist. Ireland, iv, p. 266. 



Mud lamprey, Couch, Fish. Brit. Isles, i, p. 404, pi. ccxlviii, f. 2. 



In appearance this much resembles the last described form, but is smaller ; 

 while its eye, nasal orifice, and first branchial opening are nearer to the snout 

 than in either of the two preceding forms. Lips wide and fringed. Teeth — as in 

 the P. fiuviatilis, but the points are blunter. Fins — the two dorsal fins continuous 

 or only separated by a notch, the first commencing about or a little before 

 the total length, while the second dorsal is continuous with the caudal, and 

 inferiorly a fin is present as far as the vent. Colours — silvery along the back, 

 becoming white beneath ; the fins sometimes with a brown tinge. The larval 

 form is distinguished by being edentulous, and the upper lip merely covers the 

 upper portion and sides of the mouth, while it is surrounded by numerous short 

 cirri. The fins, are likewise small and not well developed. It has been questioned 

 whether this fish is not the young form of the river lamprey. 



Names. — -The pride, or blind lamprey, or fringe-lipped-lamprey. This fish has 

 been termed the Pride of the Isis (Plot's "Hist, of Oxfordshire"), but the term 

 pride was evidently employed in a wider sphere than the County of Oxford alone, 



