412 PLEUBONECTID^. 



Rhombus cardina, pt,, Cuv. Regne Anim. 



Pleuronectes megastoma, Donov. Brit.Fish. iii. pi. 51 ; Turt.Brit.Faun. 

 p. 97 ; Flem. Brit. An. p. 196 ; Jen. Man. p. 465 ; Yarr. Brit. Fish. 

 2nd edit. ii. p. 342, and 3rd edit. i. p. 654 (fig. bad) ; Dilben 8f Koren 

 in Vet. Akad. Handl. 1844, p. 102. 



pseudopalus, Hammer in Penn. Brit. Zool. ed. 1812, iii. p. 324. 



pi. 52. 

 Carter, Couch in Linn. Trans, xiv. p. 78. 

 Rhombus megastoma, Nilss. Skand. Faun. Fisk. p. 641. 

 Zeugopterus (?) velivolans, Richards, in Yarr. Brit, Fish. 3rd edit. i. 



p. 656 a (fig. good). 

 B. 7. D. 85-87. A. 67-69. L. iat. 120. Vert. 11/30. 

 The height of the body is contained twice and two-thirds in the 

 total length (without caudal), the length of the head thrice and a 

 half. Scales rather small, with the posterior margin ciliated and 

 rounded, covering nearly the whole head (the interorbital space and 

 the maxillary included) ; interorbital space very narrow ; the dia- 

 meter of the eye is two-ninths of the length of the head. Each fin- 

 ray is accompanied by a series of minute rough scales. Lateral line 

 with a subsemi circular curve above the pectoral. Lower jaw pro- 

 minent ; the length of the maxiUary is contained twice and a third in 

 that of the head*. The lower eye is somewhat in advance of the 

 upper. The dorsal fin terminates at a distance from the caudal 

 which equals the depth of the free portion of the tail ; its longest 

 rays are at the commencement of the posterior third of the fin, where 

 they are two-fifths of the length of the head, and somewhat shorter 

 than the pectoral. No spine before the anal. Yellowish-brown. 



Coasts of Great Britain ; occasionally on the coasts of Ireland and 

 Scandinavia. 



a-h. Adult : skins and stuffed. British specimens. 

 i. Young : stuffed. English coast. 

 Tc. Adult : skeleton. British. 



All the bones of this species are thinner and more slender than in 

 Rh. mn.rirrjis and in Rh. Icevis ; the length of the first interhsemal 

 spine equals that of the nine anterior vertebrae. 



6. Rhombus norvegicus. 



Rhombus cardina. Fries in Vet. Akad. Handl. 1838, p. 184 (not syn.) ; 



Nilss. Skand. Faun. iv. p. 643. 

 Smahvarf, Sundev. in Fries Sf Ekstr. Skand. Fisk. p. 200. pi. 50. 



D. 78-80. A. 58-64. 

 The height of the body is two-fifths of the total length (without 

 caudal), the length of the head two-sevenths ; the length of the 

 maxillary is one-half of that of the latter, the diameter of the eye 

 one-fourth. The dorsal fin commences before the front margin of the 

 upper eye and behind that of the lower, and terminates at some 

 distance from the caudal ; its greatest height is in its hinder fourth. 



* Teeth in the jaws in a very narrow band, widening anteriorly. 



