178 



ANCEIDJE. 



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 cceruleata, 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 cceruleata of Costa. Praniza maculata of Westwood, Praniza mau- 

 ritanica of Lucas, and Praniza Reinhardi of Kroyer, 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 (g), 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 (Annals N. H. s. 3, vol. ii. pi. 6), 

 or by M. Hesse. 



