20 



^-anular. On tlie middle of the fourtli abdominal tergum is a pair of large 

 tubercles, just like pearls, in tlie closest contact witli one another. 



Carapace subglobular, longer than broad; the regions hardly indicated, 

 though the cervical groove is fairly plain. 



Front triangular, concave, deflexed, its apex continuous with that of the 

 epistome. Supra-orbital borders timiid. 



Antennal peduncle stout, the flagellum nearly as long as the carapace. 



Chelipeds equal, a little longer and stouter than the first three pair of legs 

 and not much longer than the carapace : the fingers are short and stout, and 

 meet throughout their extent. 



The last pair of legs are mere rudiments, being slender and hardly longer 

 than the basal joints of the preceding pair. 



Colours in spirit, milk white, eyes deeply pigmented. 



A single small male from the Andaman Sea, 75 fathoms : the length of the 

 carapace is 5 millim. 



Except for its legs, only the last pair of which is reduced in size and is 

 dorsal in position, this species, by reason of its subglobular carapace, looks far 

 more like a Dromia than a Dynomene. 



Beachyura Oxtstoma. 



Family CcilajJiJidce. 



Calappa, Fabr. 



Calappa, Fabricins, Ent. Syst. Scppl. p. 345 : BoBc, Hist. Nat. Crust. I. p. 179 : Latreille, Hist. Nat. Crnst, 

 et Ins. V. p. 389 : and in Cuvier's Regne Animal, 2nd ed. 1829, p. 66 : Lamarck, Hist. Nat. Anim. Sans. Vertebr. 

 V. p. 484 : Desmarest, Consid. Gen. Crust, p. 108 : Risso, Hist. Nat. Enr. Merid. V. p. 30 : Roux, Crust. Medit. 

 p. 5 : Milne Edwards, Hist. Nat. Crust. II. 102: De Hiian, Fann. Japon. Crust, pp. 69, 70, 125 : Dana, U. S. Expl. 

 Exp. Crust, pt. I. p. 391 : Heller, Crust. Sudl. Europ. p. 129 : Miers, Challenger Brachyura, p. 283 : Aloock, J. A. 

 S. B. Vol. LXV. pt. 2, 1896, p. 139. 



Carapace strongly convex, rounded in front, much broadened behind by a 

 pair of clypeiform expansions, or wings, beneath which the four pairs of ambu- 

 latory legs are concealed in flexion. 



Front small, somewhat triangular, projecting little or not at all beyond the 

 level of the orbits, bilobed. 



Orbits small, circular : eyestalks short and thick. 



The antennules fold nearly vertically beneath the front. 



The basal joint of the antennje is very broad, and fills a wide hiatus at the 

 ijiner angle of the orbit : the flagellum is short usually. 



There is no distinct epistome ; but the endostome is prolonged, as far as 

 the antennulary fossae, in the form of a canal, which is divided longitudinally 



