178 ANCEID#. 
posterior to it. That we have not been misled into 
accepting as parallel stages, conditions which are only 
successive changes, as is stated by M. Hesse to be the 
case, we are assured, from the circumstance that we 
have seen, and have in our possession, specimens of the 
female from the smallest to the largest size ; and similar 
ones of the male also, beginning, in each case, with 

DEVELOPMENT OF ANCEUS. 
This cut represents an animal, with its details, which agrees entirely 
with Montagu’s figure of Praniza ceruleata, and which, notwithstanding its 
large size, we presume must now be regarded as the fully developed larval form 
of the female. (Praniza fuscata of Johnston, Oniscus marinus of Slabber, 
Praniza ceruleata of Costa. Praniza maculata of Westwood, Praniza mau- 
ritanica of Lucas,-and Praniza Reinhardi of Kréyer, judging from the 
figures given by these various authors, are animals in their larval condition, 
whereas Praniza obesa of Lucas decidedly represents an adult ovigerous 
female.) In the details given above are representations taken in different 
points of view of the maxillipod (q), showing the varied positions of the ser- 
rated portion ; the mandibles also (d) are much weaker than those organs 
are represented either by Mr. Spence Bate (Annal§ N. H. s. 3, vol. ii. pl. 6), 
or by M. Hesse. 
