24 EEPEODUCTION AND DEVELOPMENT OF TELEOSTEAN FISHES 



another species of Solea ; it seems to me probable tliat it belongs to 

 Solea variegata. 



Other species of Pleuronectidce. — It will be useful here to summarise 

 the present state of our knowledge concerning the reproduction of 

 other species of the flat-fish family. I have already mentioned that 

 Day considers Solea lascaris and Solea impar of Giinther's British 

 Museum Catalogue to be one and the same species, and that 

 Raffaele has examined the mature unfertilized ovum and finds it has 

 the same peculiarities of structure as Solea vulgaris. The species 

 occurs occasiooally at Plymouth, but I have never met with a 

 specimen, and it is too rare to be of any importance for practical 

 hatching. Day also unites Solea hitea and Solea ininida of Giinther. 

 This is a very small and practically unimportant species which also is 

 rare at Plymouth, and I have not seen a specimen. 



Of Pleuronectes I have previously* described the ova and deve- 

 lopment of P. Jlesus, the flounder; P. limanda, the dab ; P.'platessa, 

 the plaice, and P. cynoglossvs, the witch, or pole flounder. These, 

 with P. microcephalus, are the only British species of the genus. 

 The eggs and larvae of all these species are closely similar and 

 differ only in size. The eggs and larva of P. Americanus described 

 by Agassiz and Whitman in Pelagic Stages, &c., have the same 

 characters. 



Bhomhus maximus, the turbot, and P. Isevis, the brill, both occur 

 at Plymouth. I have not been able to get ripe ova of either, but 

 Raffaele considers certain ova which he obtained from the tow-net, 

 which had a diameter of 1"33 mm., a homogeneous yolk, and a single 

 large oil- globule, as belonging to R. Isevis. He also figures larvee of 

 this species. Wenckebach describes the mature ova of P. maximvs 

 as having a diameter of '75 mm. 



Arnoglossus includes two species which occur at Plymouth, of 

 which Arnoglossus laterna, the small scald-fish, is of no importance in 

 the fish market. Concerning this species I have some incidental 

 remarks to make. It is very common at Plymouth, and inside the 

 Sound, especially in Cawsand Bay, young specimens of all sizes 

 from three quarters of an inch long up to the full size of about six 

 inches, are taken in numbers by the small trawls used for catching 

 shrimps. It is constantly reported by fishermen that the shrimpers 

 catch numbers of young soles, but the report is simply founded on a 

 mistake, these young scald-fish being erroneously taken for soles. 

 On August 15th, 1888, I went, with Mr. Bourne, on purpose to test 

 this matter, and after trawling for a long time in Cawsand Bay we 

 got large numbers of young scald-fish, but only one young specimen 

 * The Eggs and Larvm of Teleosteans, Trans. Roy. Soc. Edinb., vol. xxxiii, pt. 1, 1887. 



