484 Survey of Fishing -Grounds, West Coast of Ireland, 1890—1891. 



Rhombus norvegicus, Giinther. The Norway Topnkot. (Littoral.) 



Rhotnhus norvegicus, . . . Gunther, "Cat. Brit. Mus.," iv., p. 412. 



„ „ ... GiJNTHER, "Proc. Roy. Soc. Edinb.," xv., 1888, 



p. 217, pi. IV., fig. C. 

 „ „ ... Holt, "Sci. Proc. Ro3^ Dub. Soc.,"vii., 1891, pt. 3, 



p. 218. 

 ,, ,, ... Cunningham, "Journ. Mar. Biol. Assoc," vol. ii., 



No. 4, p. 325. 

 Pleuronectes or Rhombus car- Cuvieu, Tries, Ekstrom, Kr5yer, Sunderall, and 



dina, Nilsson. 



Ekstrom'' s Tojyknot, . . . . Couch, "Fish. Brit. Isles," p. 175. 



Diagnosis of Species. (D. 80-83. A. 66-67. P. 8-10. L. lat. 50 ca.)*— 

 Exclusive of the caudal peduncle, the shape is regularly fusiform, somewhat 

 elongate ; the greatest height of the body, situate opposite the extremity of the 

 pectoral, contained about twice and a-half to twice and two-thirds in the total 

 length, without the caudal fin. Caudal peduncle rather conspicuously elongate, 

 its height equal to the length of the eye. The length of the head contained about 

 three and a-half times in the total length, without the caudal fin. The eyes from 

 two-sevenths to one-third of the length of the head, separated from each other by 

 a high, narrow, scale-clad, and doubly-curved ridge ; the lower eye but slightly in 

 advance of the u^ijper, which is close to the dorsal contour ; the length of the snout 

 slightly less than that of the eye ; the lower jaw somewhat prominent ; the upper jaw 

 nearly one-third the length of the head, its posterior extremity extending beyond the 

 front margin of the eye, but short of the level of a vertical from the pu^iil ; teeth on 

 the head of the vomer extremely small ; lateral line with a sub-semicircular curve 

 above the pectoral fin ; pectoral of ocular side much larger than that of blind side; the 

 fourth ray the longest, extending beyond the curved part of the lateral line ; equal 

 in length to the eye and snout ; pelvic fins extending beyond the origin of the anal, 

 but not continuous therewith ; dorsal and anal fins of moderate height ; dorsal 

 commences in front of the eye; its first ray may be slightly elongate, and 

 furnished on the blind side with a tapering fold of membrane ; the last few rays 

 of both dorsal and anal rather fleshy, forming small fan-like expansion on the 

 blind side of the caudal peduncle ; caudal fin rather large, almost truncate in 

 posterior outline. 



* These figures are based upon our own somewliat limited acquaintance with the species. Gunther 

 (Cat., he. cit.) gives D. 78-80, A. 58-64. 



