988 ME. H. M. KTLB ON a [Dec. 18, 



Turbot group, and the specific term from the name of the naturalist 

 who entrusted me with the specimen. 



Characters. — Total length 21*8 cm. Total length without caudal 

 fin 17'5 cm. Greatest height (without dorsal and anal fins) 68 

 per cent, of total length without caudal fin. Distance of greatest 

 height from the beginning of the caudal fin-rays 57 per cent, of 

 the same dimension. Length of caudal fin 24 per cent. do. 

 Length and height of caudal peduncle 35 per cent, and 50 per 

 cent, respectively of the length of the caudal fin. Distance of 

 snout from base of pectoral fin 28 per cent, of total length without 

 the caudal fin. Length of under ramus of the mandible 10 per 

 cent, of the same dimension. 



Br. 7. D. 55. A. 41. P. 10/10. V. 6/6. C. 2 + 7 + 7 + 2=18. 



Vert. 10 + 19=29. 



Eyes on the left side. Lamina? of olfactory organ disposed 

 longitudinally to the main axis of the body. 



The form of the specimen described is rhomboid and somewhat 

 similar to that of the Turbot (fig. 1, p. 987). Beginning at the 

 snout the height increases rapidly until at a distance of one third 

 the total length of the animal the greatest height of the body is 

 attained. This greatest height is more than one half of the total 

 length, or 68 per cent, of the total length minus the caudal fin. 

 From this point the height of the body decreases sharply until at 

 the base of the caudal peduncle it is only 10 per cent, of the total 

 length. The relatively great height with the rapid decrease on each 

 side of the line of greatest height gives the specimen a truncated 

 appearance, and this is further increased by the peculiar disposition 

 of the dorsal and anal fin-rays. The longest of these — 25th to 29th 

 dorsal, 15th to 20th anal — are posterior to the greatest height and 

 almost halfway along the total length of the body. 



The dorsal Jin begins anteriorly on the snout, anterior to the 

 maxillary bones. Owing to the greater convexity of the upper or 

 eyed surface of the head, the fin-rays seem to arise more from the 

 blind side. The first three rays are free at the ends. The rays 

 are simple anteriorly, but about the 16th ray they become slightly 

 bifid at the tip, and this condition increases posteriorly until at 

 the hinder end each ray is spread out somewhat like a feather. 

 The anal Jin is similar, but the bifid rays begin with the fourth 

 anteriorly. Posteriorly the dorsal and anal fins are distinct from 

 the caudal Jin, which is of a broad truncate form and not quite 

 symmetrical. The pectoral Jin of the eyed side is about 16 per 

 cent, of the total length, that of the blind side somewhat less. 

 The uppermost ray in each is simple, but the remainder are bifid 

 and feathery at the lips. The ventral Jins are similar in many 

 ways to those of the Turbot. Both are prolonged anteriorly 

 beyond the base of the clavicles : that of the eyed side lies along 

 the ventral edge and is attached to the urohyal anteriorly ; that 

 of the blind side does not reach to the urohyal and is thus placed 

 somewhat posteriorly to the other, its first ray lying between the 



