152 Bulletin Vanderhilt Marine Museum, Vol. V 



The external maxilliped is rectangular, very close fitting, smooth 

 externally, the merus which is wider than long, has both its inner and 

 outer distal angles obliquely truncate and the median distal margin 

 concavely excavate as is also the adjacent margin of the epistome, to- 

 gether forming an aperture for the excurrent channel. 



The chelipeds are decidedly unequal in the male, the right one 

 being very much larger and its fingers having a slight gape, while 

 those of the left cheliped are more decisively deflected, slenderer and 

 meet throughout their length. The merus is short and does not extend 

 beyond the margin of the carapace ; the carpus rounded, with its inner 

 angle produced to a sharp ridge ; the propodus and related fingers of 

 of the larger cheliped are one and two-fifths times the length of the 

 carapace ; with the palm high and thick, very convex on its outer and 

 upper surfaces, the upper surface and outer two-thirds being rugose, 

 roughened with wrinkles and coarse pittings ; the lower outer surface 

 is smooth ; both fingers are short, curved, with pointed tips ; the upper 

 finger has one large molar. The palm of the smaller cheliped is paved 

 with coarse round granules on its upper and outer surfaces. Both 

 upper fingers are black-tipped for half their length ; the lower fingers 

 are creamy color. 



The ambulatories are small, successively decreasing in length from 

 the first to fourth pair. All have the meral, carpal and propodal 

 joints laterally compressed, the dactyl stout, hary-tipped and encased 

 in velvety pilosity throughout their entire dactyli. 

 References: Ozius tuherculosus Henry Milne Edwards, Hist. Nat. 

 Crust., t. I, p. 405, 1834. — Heller, Reise Osterreich. Fregatte 

 "Novara" Zool. Crust., 23, 1868. — A. Milne Edwards, Nouv. 

 Archiv. Mus. Hist. Nat., t. IX, p. 238, pi. 11, fig. 2, 1873.— Hoff- 

 man, in Pollen and Van Dam, Recherches sur Faune de Mada- 

 gascar, Ins. et Crust., Pt. V, p. 39, 1877.— Muller, Verb. Naturf . 

 Gesellsch. Basel, vol. VIII, p. 747, 1890.— de ]\iAN, Journ. Linn. 

 Soc. London, ZooL, vol. 22, p. 45, 1888. — Laurie, R. D., Ceylon, 

 Rept. Pearl Oyster Fish., vol. V, p. 407, 1906. 



Subfamily: Piluminae. 

 Genus: PILUMNUS Leach. 

 Pilumnus globosos Dana. 

 Plate 78. 

 Type: Dana's type series was taken by the United States Explor- 

 ing Expedition at Waterland and Raraka, Paumotu Islands and Ta- 



