132 Carcinological Fauna of Tudia. 
The branchial formula is as follows :— 
Somites and 
their appendages. Podobranchiz. _ Arthrobranchiz. Pleurobranchiz. 
Nalits ae O ep. 0 0 = ep. 
VIII. Ns 1+ep. 1 O = 2+ep. 
IX. ee 1+ep. 2 O = 38+ep. 
xX. se Pecrepe 2 9) 3+ ep. 
XI. ewe 1+ ep. 2 1 = 4+ep. 
XII. es 1+ep. 2 1 = 4+ep. 
XIT1. cas 0 2 Ler) 13 
XIV. ae 0) 0 1a 
5+6 ep. 1k 4 20+6 ep. 
The formula is thus the same as.that given by Bouvier for Homolo- 
dronva. 
1. Arachnodromia Baffini, Alcock and Anderson. 
Arachnodromia Bafini, Alcock and Anderson, Ann. Mag. Nat. Hist., Jan. 1899, 
p. 7: Alcock, Investigator Deep Sea Brachyura, p. 19, pl. ii. fig. 1. 
Carapace square-cut, dorsally convex, very distinctly (from a fourth 
to a fifth) longer than broad, its greatest breadth being just in front of 
the posterior border, its greatest depth approximating its greatest 
breadth, its surface—like that of the appendages and other parts of 
the body—tomentose. Except for a few small sharp granules anterior- 
ly and laterally and along the lateral border, the carapace is unarmed. 
The front is deeply cleft to its base, and has the form of two acutely 
triangular teeth. 
Upper margin of orbit notched near its outer angle which is 
dentiform, the outer angle of the lower margin of the orbit is much 
more strongly dentiform, and the (outer) orbital wall between the two 
spines is deficient. 
Antennal flagella longer than the carapace. 
Chelipeds rather slender, unarmed except for a few granules seen 
on denudation, about 15 times the length of the carapace : fingers strong- 
ly hollowed ‘en cuillére,’ especially the immovable one, which alone has 
teeth: wrist not elongate. 
First two pairs of legs more than twice the length of the carapace : 
their dactyli are about two-thirds the length of the preceding joint, are 
stout, are sharply spinate along the posterior edge, and end in a claw. 
The last two pairs of legs are about the same length as the carapace : 
their small claw-like dactyli shut down on a ring of spines at the end of 
the preceding joint. 
582 
