142 Scientific Intelligence. 
make seven in all. ‘eover they e demonstrated in the\ adult 
Squilla, Axius, and Pagurus, and particularly well in Homarus, 
the parts are more distinct from their large size. The “ duncle” of 
the antenna in the lobster is considered by Milne-Edwards to consist of 
five joints; but a sixth is indicated at the base of the penult, on the 
lower side of thé member. Here there is a small triangular piece, 
articulating with the second and third joints as well as the penult, per- 
fectly mobile, and dependent upon no one of these joints more than 
another. An additional evidence that this piece is the representative of 
a distinct joint is furnished by the fact that the articulations of the two 
proximate joints are in the same plane, and not, as should be the case 
the maxillipeds, which has the same position. It is called seaphocerite 
by ite, 
its basal joint is obsolete or coalesced with the terminal squamifi 
joint in adult Macroura and Anomoura, while in Brachyura the entire a 
pendage disappears with perfect development. The little basal joint: 
the exocerite in embryo Homarus is mistaken for the “ armiger” (basic 
erite) by Dr. Strahl, who considers the large joint which supports both 
branches of the antenna as the “ intercalare” (coxocerite), on the ground 
that in the adult the third joint is articulated with both the coxocerite’ 
and the basicerite. But this is so only in appearance ;—if the antenna 
es 
large supporting joint which is the first to make its appearance, and 
which often reaches, with its exocerite, a large size before any trace of 
other joints, either coxal or terminal, can be perceived. In the figures 
accompanying the valuable observations of Dr, C. Spence Bate (Phil. 
* . 
a rudimentary condition, and there is no coxocerite visible. This aa 
joint, with its areola, makes its appearance at a later date, at the base 
2 Proc. Acad. Nat, Sci. Philad., Dec, 1858. Not the Mastigopus of Leuckart 
which is a Sergestes. 
