REPORT ON THE CRUSTACEA MACRURA. 



911 



He supposed it to be a male, but he figures the anterior pair of pleopoda as biramose, 

 which does not correspond with my observation as to the permanent character of this 

 appendage in the male. 



This specimen retains all the features described in previous specimens, but it has in 

 addition a seventh pair of pereionic appendages, that only differs from Suhm's figure in 

 being shorter, but it is considerably longer and in a more developed condition than that 

 represented in Claus' figure of a similar stage. These appendages, as seen in fig. 2o — 

 the fifth pair of pereiopoda,- — differ from all the preceding in being smaller, and in not 

 having an ecphysis attached to the basisal joint; moreover, they appear to be seven-jointed, 

 whereas all the preceding legs consist of six joints only. It has a branchial plume similar 

 to those belonging to the other pereiopoda, but smaller, and like them attached to the 

 lateral walls of the pereion rather than to the coxal joint, they are therefore pleurobranchise, 

 and may be tabulated as follows : — 



Pleurobranchise, . . . ... 1 1 1 11 1 



Arthrobranchise, . . . 



Podobranchias, . . . 



Mastigobranchiae, . . . 



The pleopoda now appear as biramose appendages, of which both stalk and branches 

 are short and flat, but as yet they are not fringed with hairs, the inner ramus has a 

 stylamblys attached to each successive pair, excepting the posterior, which forms the 

 lateral plates of the rhipidura and is fringed with long hairs. 



The telson is tapering and terminates in two small teeth that approach each other at 

 their apices. 



The ophthalmopoda are less elongated, and the first pair of antennae has the flagella 

 a little more tapering, but the peduncle is not more distinctly articulated, while the 

 second pair is apparently not advanced from those seen in fig. 2. 



The nervous system appears to be more concentrated, the central ganglia being in a 

 firmer condition, each group consisting of two ganglia, separate from each other from 

 the second gnathopod to the fourth and probably the fifth pair of pereiopoda. 



The oral appendages, closely packed together and well developed, stand halfway 

 between the frontal margin and the first pair of gnathopoda. 



