322 A. E. Verrill — North American Cephalopoda. 
2. By the second week in July, the first hatched of the June squids 
have grown to the size in which the body (or mantle) is 30 to 48 mm 
long ; but these are associated with others that are younger, of 
all sizes down to those just hatched. But they begin to show a dis 
position to go in “schools” composed of individuals of somewhat 
similar sizes. 
3. By the second week in August, the largest June squids have 
become 50 to 68 mui in length of body, and the later broods are 5 
to 30 mm long. As before, with these sizes occur others of all ages 
down to those just hatched. It should be observed, however, that 
in those of our tabulated lots taken by the trawl, the very small sizes 
are absent, because they pass freely through the coarse meshes of the 
net. 
4. By the second week in September, the June squids have the 
mantle 60 to 82 nim long. All the grades of smaller ones still 
abound. A few larger specimens, taken the last of August, and in 
September, 84 to 110 mra long, may belong to the June brood, but 
they may belong to those of the previous autumn. 
5. In the first week of November, the larger young squids taken 
had acquired a mantle length of 79 to 85 mm , but these are probably 
not the largest that might be found. Younger ones, probably 
hatched in September and October, 8 to 20 mm in length of body, 
occurred in vast numbers Nov. 1, 1874. The specimens taken Novem- 
ber 16, oft’ Chesapeake Bay, having the mantle 70-90 mra long, probably 
belong to the schools hatched in summer. 
6. In May and June the smallest squids taken, and believed to be 
those hatched in the previous September or October, have the man- 
tle 62 to 100 mm long. With these there are others of larger sizes, 
up to 152 to 188 mm , and connected with the smaller ones by inter- 
mediate sizes. All these are believed to belong to the various broods 
of the previous season. In these, the sexual organs begin to increase 
in size and the external sexual characters begin to appear. The males 
are of somewhat greater length than the females of the same age. 
7. In July, mingled with the young of the season, in some lots, 
but more often in separate schools, we take young squids having the 
mantle 75 to 100 mm long. These we can connect by intermediate 
sizes with those of the previous year, taken in June. I regard these 
as somewhat less than a year old. 
8. Beyond the first year it becomes very diificult to determine the 
age with certainty, for those of the first season begin, even in the 
autumn, to overlap in their sizes those of the previous year. 
