CASHIERING THE ANOMURA 133 
CHAPTER X 
TRIBE V.—ANOMALA 
THE sternal plastron or breastplate is wide. The 
branchiz lie obliquely, and may attain the number of 
fourteen pairs. ‘The vulvee open not on the breastplate, 
but in the bases of the third pair of legs. 
This tribe of Anomalous Brachyura has long been con- 
sidered a division of a separate sub-order called the 
Anomura, meaning Stalk-eyed Crustaceans ‘with un- 
symmetrical tails.’ T’o this division the name Apterira 
was given, to distinguish it from another division called 
Pterygira. The first name signifies those that have 
unwinged tails, the second those that have winged 
tails. The wings referred to are formed by the ap- 
pendages of the sixth segment of the pleon, which in 
the Pterygura are expanded on either side of the telson, 
‘but which in the Apterura are not developed. By the 
transfer of the latter division to the Brachyura its old 
name becomes unsuitable, since all of that sub-order are 
apterurous. It contains two legions, the Drominea and 
Ranininea. 
Legion 1.—Drominea. 
The carapace is subglobose or subquadrate, the 
‘front’ narrow. ‘The third maxillipeds have the third 
and fourth joints subquadrangular. ‘The lateral apode- 
mata! of the trunk are united in a common centre, form- 
ing a sternal canal. The last pair, and often the last two 
1 The apodemata or apodemes are processes formed by an infolding 
of the cuticle and extending inwards to give surfaces of attachment for 
the muscles and to assist in protecting the internal organs. 
