S. I. Smith—Early stages of the Lobster. 405 
tip of the rostrum. The antennal scale is very much redu 
The lateral angles of the second to the fifth abdominal seg- 
ments are prolonged downward into long spiniform teeth, the 
appendages of the penultimate segment are oval, and margined 
with long plumose hairs. The terminal eek is nearly 
quadrangular, as wide at the extremity as at the base, the pos 
terior margin arcuate, but not extending beyond the prominent 
lateral angles, and furnished with hairs like those on the 
margins of the lamelle of the appendages of the penultimate 
en 
n this last stage, the young lobsters swim very rapidly 
means of the abdominal legs, and dart backward, when disturbed, 
with the caudal appendages, frequently jumping out of the water 
in this way like A ep which their movements in the water 
much resemble. They appear to be truly surface animals as 1n 
the earlier stages, ree 
From the dates at which the different forms were taken, it 18 
probable that they pass through all the stages here described in 
the course of a single season. How late the young, after reach- 
ing the lobster-like form, retain their free-swimming habit was 
Not ascertained, 
