132 A. Alcock — Garcinologieal Fauna of India. [No. 3, 



The branchial formula is as follows : — 



Somites and 













their appendages. 



Podobranchiae. 



ArthrobranchisB. 



PlenrobranobisB. 



VTT. 



ep. 











= 



ep. 



VIII. 



1 + ep. 



1 







= 



2 + ep. 



IX. 



1 -»■ ep. 



2 







=> 



3 + ep. 



X. 



1 + ep. 



2 







- 



3 + ep. 



XI. 



1-^ep. 



2 



1 



«= 



4 + ep. 



XII. 



1 + ep, 



2 



1 



= 



4 + ep. 



XIII. 







2 



1 



= 



3 



XIV. 











1 



= 



1 



5 + 6 ep. 11 4 20 + 6 ep. 



The formula is thus the same as that given by Bouvier for Homolo- 

 dromia. 



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, pi. 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 If times the length of the carapace : fingers strong- 

 ly hollowed ' en cuillere,' 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. 



