ICHTHYOLOGY ACANTHOPTERYGII. 99 



On the subject of Isinglass, some lengthened memoirs 

 are given in the third Volume of M'Clellaud's Calcutta 

 Journal of Natural History, 1843. Production of Isinglass 

 on the Coasts of India, with a Notice of its Fisheries. By 

 J. Forbes Royle, p. 76. On East Indian Isinglass, its 

 Introduction to, and Manufacture for, the European Market. 

 By M'Clelland, p. 157. Extract of a Letter from E. 

 O'Reiley, pp. 287, 289. 



Remarks on the external respiratory Muscles of Fish. 

 By Robert Remak. (Muller's Archiv, 1843, p. 190.) 



On the Caudal and Cephalic Sinuses of Fish, and the 

 lateral system of Vessels connected therewith. By Hyrtl. 

 (Muller's Archiv, 1843, p. 224.) 



ACANTHOPTERYGII. 



In this division a great number of new species have been 



introduced. 



PERCID.E. Perca l&vis, Jeuyns, Beagle. Black brown, punctated, snout 

 in front of the nasal cavities naked, scales of the trunk smooth. Allied to 

 P. trucJia, Val., D. 9. 1. 1] ; A. 3. 9. Patagonia, 



Lalirax nigricans, De Kay. Dusky, with a tinge of yellow, first dorsal fin 

 higher than the second; D. 10. 1. 12; A. 3. 8. New York. L. albidiis, 

 De Kay, blueish white, with slender, dusky lines; D. 9. 1. 13 ; A. 3. 12, 

 Lake Erie. 



Under the genus Lab rax, which Schlegel places with the Scleroparei, he 

 describes a new species, L. agrammus, with a single lateral line, otherwise 

 very like L. hexogrammm. 



Pileoma, new gen., De Kay, allied to Hiiro. Two distinct dorsal fins, 

 praeoperculum smooth, operculum with a weak, fiat spine. Abdominal fins 

 with fine soft rays. Teeth equal sized. J'. semifastiatum, olive green, with 

 numerous dusky, transverse bands ; D. 13. 15 ; A. 12. 2 inch. Lake 

 Champlain. 



Lucioperca grisea, De Kay. Two dorsal fins, prpcoperculum smooth at 

 the margin, operculum scaly, with a spine, six branchial rays, nape com- 

 pressed, contracted. B. tewllatinn, brownish, with quadrangular spots on 

 the back and sides ; 3 inch. D. 9. 1-i ; A. 10. In the rivers of New York. 



Serranus albomaculatus, Jeuyus, Beagle. A series of white spots on the 

 sides, jaws scaleless ; D. 10. 13 ; A. 3. 8 ; Galapagos. S. aspersus, id. Dark 

 green above, paler beneath, sprinkled on the sides with light emerald green ; 

 1). 11. 15 ; A. 3. 8. Cape de Verd Islands. S. labriformis, id. Prseopercu- 



