AND THEIR DISTRIBUTION AT DIFFERENT AGES. 

 Zeus faher, the Dory. 



Ill 



Althougli the above table includes but a small number of speci- 

 menSj I believe tbat it represents witb considerable certainty the 

 growtb of the dory. I do not know exactly when the dory spawns, 

 but I have examined the adults in spring and found the ovaries 

 ripening, and in autumn have found them shotten, so that I conclude 

 the spawning takes place about June and July. In the table I have 

 reckoned the ages from July. It will be seen that specimens 

 from 6 to a little over 7 inches in length are fairly common in 

 August and September, and since young specimens of 1 to 2 inches 

 in length occur in autumn, it is evident that the former are just 

 over one year old, while the latter are derived from eggs shed in 

 the preceding summer. The last specimen in the table is, I think, 

 too large to be only one year old, and I therefore judge it to be in 

 its third year. The largest dory mentioned by Day was 22| inches 

 long, but the usual size is from 15 to 18 inches, which is probably 

 not reached in less than three years. 



Motella mustela, the Five-hearded Bochling. 



In this Journal, vol. i, p. 372, I mentioned some specimens of 

 this species kept in the Aquarium from May to August, 1890. All 

 except one of these were placed in a large tank and have not been 

 seen again, but the remaining specimen was measured alive on 

 May 19th, 1891, when just over a year old, and found to be 13"0 

 cm., or 5'1 inches long. Measured again on September 21st, it 



NEW SERIES. VuL. II, NO. 2. 10 



