PISCES. 321 



55. HIPPOGLOSSUS. Jaws and pharyngeans armed 

 with strong sharp teeth : dorsal commencing in a line with 

 the upper eye, and terminating before the caudal: form 

 oblong : eyes sometimes on the right, sometimes on the 

 left side. 



56. PLEURONECTES. Jaws and pharyngeans with 

 fine card-like teeth : dorsal commencing immediately above 

 the upper lip, and reaching, as well as the anal, to very near 

 the caudal : form rhomboidal : eyes generally on the left 

 side. 



57. SOLEA Mouth irregular, and as it were twisted 



on the side opposed to the eyes, and furnished on that side 

 only with fine velvet-like teeth, the upper side being without 

 teeth : form oblong-oval : snout rounded, advancing beyond 

 the mouth : dorsal commencing at the mouth, and reaching, 

 as well as the anal, quite to the caudal. 



(1. SOLEA.) Pectorals of moderate size, and not very unequal. 



(2. MONOCHIRUS.) Pectoral on the side of the eyes extremely small; 

 that on the side opposite rudimentary, or altogether wanting. 



VII. DISCOBOLI. Centrals united, forming a 

 concave disk beneath the body: skin without 

 scales. 



58. LEPADOG ASTER Pectorals large, descending 



to the inferior surface of the body, then doubling forwards 

 upon themselves, and finally uniting under the throat by 

 a transverse membrane: a second, circular, concave disk 

 behind the disk formed by the united ventrals: head broad 

 and depressed ; snout projecting : gill-opening small ; 

 branchiostegous membrane with four or five rays : one 

 dorsal. 



59. CYCLOPTERUS Pectorals large, uniting under 



the throat, and enclosing the disk of the ventrals : no second 



X 



