LARVAL AND POST-LARVAL TELEOSTEANS. 363 



As Kyle* has remarked on his single specimen of 7 mm,, the depth 

 of body is considerable. This is also a characteristic feature in nearly 

 all my specimens, and contrasts with the much narrower body of Peter- 

 sen's post-larvee. There is the further difference to be considered in 

 the localities of the two captures. The area of maximum intensity of 

 this species in the region investigated at Plymouth lies between the 

 twenty and thirty fathom lines, at no great distance from land, 

 whereas Petersen secured his specimens at considerable distances off- 

 shore, and over much greater depths. 



The numerical characters of my specimens certainly agree with those 

 of S. variegata. D 71-72, 

 A 56-57, 



Vertebra 9 (10)+29 (30) (31). 

 Petersen gave for his post-larvsB D 71-76, 



A 46-60 



Vertebrge 9 (10) +29 (30) (31) (32). 

 Kyle's single specimen of 7 mm. had 10+30 vertebrae. 



Structural and post-larval characteristics are much the same in my 

 specimens as in Petersen's, except for those few characters noted above. 

 There is no trace of an air bladder nor of barred pigment. Holt and 

 Byrne have noted this barred pigmentation for the transition stage, and 

 Mr. Byrne has kindly supplied me with a note on a specimen 16 mm. 

 long (without caudal) having the general appearance of the adult. It 

 was taken 50 miles W.N.W. of Cleggan Head, at a depth of about 120 

 fathoms. The youngest specimen with the adult appearance which I 

 have observed at Plymouth measured 45 mm. Further investigation is 

 required, especially in the later metamorphosing stages, to arrive at a 

 fuller knowledge of this species. 



S. lascaris Risso. (Sand-sole.) 



Our knowledge of the post-larval development of the sand-sole is 

 extremely limited. It is confined practically to two specimens, one of 

 8 mm., described by Kyle in " Rep. of the Danish Oceanographical 

 Expeditions, 1908-10, No. 2"; the other of 11 mm., described by Cunning- 

 ham as a metamorphosing stage of S. vulgaris or S. lascaris in Journal 

 M.B.A., 1897-99. Ehrenbaum was the first to attribute this latter 

 specimen definitely to S. lascaris, and, from the material at my disposal, 

 there is no doubt about his identificaticn being correct. 



* Keport Dan. Ocean. Expcd., 1908-10. No. 2. 1913. 



