132 BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
the second stage. As will be noticed from the tables, by far the largest 
number of specimens examined belonged in or near the category of the 
third stage. The number of specimens with more than seven tentacles 
in a primary quadrantic division became less as the number of tentacles 
increased, and the whole number of tentacles in any quadrant was also 
more variable. 
No fully developed Eucope was found in the fourth stage with 15 
tentacles in the primary divisions of all the quadrants (see table for 15 
tentacles, page 136), and when we come to a larger number of tentacles 
for each primary quadrantic division the irregularities of the marginal 
tentacles leave us in doubt in which stage to place them. 
In the more advanced stages sometimes only one quadrant is affected, 
the others remaining less advanced. This seems to indicate that the 
mere multiplieation (of parts) of the marginal tentacles beyond the 
third stage is accompanied with greater and greater irregularities in 
the different quadrants as the number of marginal tentacles increases. 
A special table has been made to show the variations observed from 
the normal number of eight otoliths and of the four radial canals. 
In the tables the notation 2, 8, 8; 3, 3,3; 3, 3, 3; 3, 3, 3; the 2 
indicates that starting from a radial canal there are two marginal tenta- 
cles between it and the marginal tentacle with a sense organ indicated 
by a comma ; the 3 indicates three marginal tentacles between it and the 
next sense tentacle, and again three marginal tentacles between it and 
the radial canal; and so on, the figure always indicating the number of 
marginal tentacles, the comma the sense-bearing tentacles, and the 
semicolon the tentacles at the base of the radial canal. 
Variations in number of intervening marginal tentacles, or of sense 
organs, or of radial canals, are thus easily indicated. 
Thus, 
„ 010,00 1 0, DOES 
indicates the presence of six sense-bearing tentacles, there being only 
one in two of the quadrants. 
))) 9,35109,9095, 10, 254 83485 5012 
on the contrary, is a Eucope with five radial canals and nine otoliths, 
while 
iti all, 253 
indicates a Eucope with only three radial canals and seven otoliths. 
In the tables, except in the list marked irregular, those specimens 
which differ from the normal in the number of their primary quad- 
