35 



DvNOMENE, Latreille. 



Diynomcne, Latreille in Cuvier'8 Rogne An. (nouv. eJ., 1820), p. 69: Desmareat (29), Milne Edwards (79), 

 Lamarck (54), De Hann (23), Dana (21), A. Milne Edwards (73), Ortmann (84). 



Milne Edwards and Bonvier, Crust. Decnp. Hirondello et Princesse Alice, Monaco, 1899, p. 10. 

 For references see J. A. S. B., LXVIII., pt. 2, 1899, p. 133. 



All parts usually tomentose. 



Carapace subcircular or polygonal, flattisli, slightly broader than long. 



Front broadly triangular, dorsally grooved, more or less distinctly notched 

 or divided at tip. 



Palate well delimited from epistome : efferent branchial channels well 

 defined. 



The chelipeds usually do not differ greatly in size from the first 3 pair of 

 legs : these are stout and of about equal length. 



The 4th (last) pair of legs are quite rudimentary and alone are dorsal in 

 position. 



The branchial formula, according to Milne Edwards and Bouvier, is the 

 same as that of Hoiwrnis vulgaris. 



In the male (though not in the case of any known Indian species) in addition 

 to the usual appendages of the first two abdominal somites, rudimentary append- 

 ages may be present on the next 3 somites. 



Dififrihition : Indo-Pacific, from Mauritius and Madagascar to California: 

 Tropical Atlantic in the neighbourhood of C. Verde Is. Occasionally descending 

 to depths of about 1-iO fathoms. 



Bynomenc pilummiidcs, Alcock. Plate I., fig. 2. 



Dynomenc ■pihnmioides, Alcock, J. A. S. B., LXVIIT., pt. 2, 1899, p. 133. 



Body and appendages covered with a thick coat of stiff club-shaped hairs. 



Carapace subcircular, flattish, the regions ill defined : a few inconspicuous 

 symmetrically disposed lumps on the gastric and anterior part of the branchial 

 regions. 



Front broadly-triangular, deeply grooved in the middle line. Upper ])order 

 of orbit oblique, smooth, notched near the middle ; lower border smooth, notched 

 at the inner angle as in D. nrfula. 



Lateral borders of carapace cut into 5 spiniform teeth, the last of which is 

 the smallest. 



Chelipeds in the male a little unequal, the larger one about 1^ times as 

 long as the carapace and about a dactylus longer than the longest legs : except 

 for a few denticles along the outer edge of the wrist they are, when denuded. 



