358 R. S. CLARK. 



spawning period for the three species. Kyle has noted an indefinitely 

 prolonged spawning period for A. tJiori and for A. laterna, and has sug- 

 gested a similar period for A. imperialis, although he states that the 

 main spawning period for this last species lies in spring. The occurrence 

 of a large number of larval and early post-larval forms of A. imperialis, 

 in August and September, 1913, appears to confirm the view of an 

 extended spawning period. 



The frequency of the three species is highest off-shore between the 

 twenty and forty fathom lines, and decidedly low within the twenty- 

 fathom line — the captures inside this limit being confined to four 

 specimens, 6 to 16 mm. in length, from hauls 70 A and 73 A. 



It is interesting to note the occurrence in the collection of the pale 

 North Sea and English Channel post-larval form of A. laterna, and the 

 dark Bay of Biscay form of the same species. These two varieties of 

 post-larvse have been fully described by Kyle, who has suggested a 

 higher number of vertebrae for the more southern form. 



Sub-jam. Rhombin^. 

 Rhombus maximus Will. R. IcEvis Rond. 



The few records of these two species indicate an earlier spawning for 

 the brill. Seven of the eight individuals recorded were taken beyond 

 the twenty-fathom line. Permanent bottom stages of the turbot were 

 secured with a push-net in Whitsand Bay on October 1st, 1913. These 

 measured from 25-38 mm. (1" to 1\") in length, and had fully assumed 

 the adult condition. On the same date, brill of 130-140 mm. (5" to 5i") 

 in length were secured in the otter trawl in 3 to 5 fathoms in the same 

 locality. These were probably a little over a year old. 



