130 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
That of the third stage, 
3 (4) T, + (4) 2 Ts + (4) 3, + (4) 6t — 48 T, 
the same as the second stage, with an additional tentacle of the ty 
order intercalated on each side of the ¢, tentacles, making 11 tentacles 
in each quadrant, or three between each of the three primary divisions 
of the quarter. 
The fourth stage, 
X (4) T, + (4) 2 To + (4) 34, + (4) 6½ + (4) 124, = 96 T, 
or a tentacle of the third order, 4% intercalated on each side of to, thus 
making 7 tentacles in each of the primary divisions of the quarter. 
The fifth stage, with 192 tentacles, would have for its formula, 
2 (4) T, + (4) 2 Ty + (4) 34, + (4) 6ta + (4) 12½ + (4) 24t, — 192 T, 
or a tentacle of the fourth order, /, intercalated on each side of th, 
thus making 15 tentacles in each of the primary divisions of the quarter. 
The theoretical formula for the sixth stage, with 384 tentacles, 
would be, 
2 (4) T, + (4) 2 T, + (4) 31, + (4) 6t, + (4) 12½ + (4) 24t, + (4) 48t; = 
384 T, 
a tentacle of the fifth order, ts, having been intercalated on each side 
of the tentacles of the f; order, thus making 41 tentacles in each of 
the primary divisions of the quarter. 
It is not necessary to carry these stages any further, as the largest 
number of tentacles observed in any primary division of each quadrant 
is not greater than thirteen, which would limit it to a modified stage of 
192 marginal tentacles. 
The accompanying tables have been arranged so as to indicate the 
association, whatever their number may be, with the highest number of 
marginal tentacles occurring in any primary quadrant. This number 
may be a normal number between any T, and To, or between any To and 
To, and may be due to the absence of one of the To tentacles, or of both, 
in the quadrant. 
A glance at the tables shows how few of the specimens examined 
possessed the normal number of tentacles. We should have as the 
normal stages of each quadrant for the four stages up to 192 tentacles. 
Te, To, To, Je, first stage, with 12 marginal tentacles. 
Tortu Toy Ay Doty T, second stage, with 24 marginal tentacles ; or, 
asin the tables il ebd Sled Ty 1, 15 of which eleven speci- 
meus were seen from the number tabulated for numerical variations. 
