EGGS AND LARVAE OF TELEOSTEANS. 117 



Anacanthini Pleuronectoidei. 



Fam. PLEURONECTIDiE. 



The development of a great number of species belonging to this family 

 has been studied. In the preceding section of this memoir, ova of four 

 species of Pleuronectes are described. Mention of the study of several 

 species has been made by M'Intosh. In Appendix F. of the Third Annual 

 Report of the Scottish Fishery Board, he states that the ova of the cod, 

 haddock, whiting, grey gurnard, common flounder, turbot, sole, lemon dab, 

 common dab, and long rough dab had been examined in the Marine Labo- 

 ratory at St Andrews. E. E. Prince describes the ova of Pleuronectes platessa, 

 P. Jlesus, P. limanda, as well as those of Gadus ceglejinus, G. morrhua, G. 

 merlangus, and Trigla gurnardus, in Ann. and Mag. Nat. Hist., May 1886, but 

 gives no figures. The young of. Pleuronectes Aniericanus, Walb., are described 

 and figured by Agassiz in Young Stages, plate ii„, from a stage at which the 

 larva is 4 mm. in length. The eggs and newly hatched larva of this species 

 are figured in Pelagic Stages, plate xvi. In the larva the rectum is, as far as 

 can be judged from Agassiz's figure, a little distance behind the yolk, and 

 the notochord seems to be unicolumnar ; but on neither of these points is the 

 figure very distinct. In all the species of Pleuronectes which I have figured 

 the rectum is in contact with the yolk, and the notochord multicolumnar. 



Pseudorhombus. — The eggs and larvae of Pseudorhombus oblongus, Storer, 

 the Sienna flounder, are figured by Agassiz in Young Stages, ii. plate ix. 

 figs. 1-3, and in Pelagic Stages, plates xiv., xv., figs. 1-14. There is one oil 

 globule, which in the newly hatched larva is at the posterior end of the yolk ; 

 at the same stage the rectum is in contact with the yolk. The character of 

 the notochord is not shown in the figures. The egg of the transparent 

 flounder, Pseudorhombus oblongus, Stein, has no oil globule, and no pigment 

 on the yolk. The figures 1-4 on plate vi. of Young Stages, ii., given under 

 the name of P. melanog aster, Stein, really belong to Tautoga onitis. 



Rhombus maculatus, Mitch. — Some advanced larvse of this species are 

 figured in Young Stages, ii., but the eggs and newly hatched larva are not 

 given. 



Hippoglossoides limandoides. — I have been unable to obtain eggs of this 

 species. Many specimens were obtained in the months of May and June, 

 which were spent ; occasionally a ripe male was obtained, but never a ripe 

 female. It probably spawns in the neighbourhood of the Firth of Forth 

 in April. M'Intosh states that he obtained the ova of this species before 

 1st June 1884, but he does not describe them. (Second Annual Report, 

 S. F. B.) 



