194 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



tooth at anterior extremity of branchial region on anterolateral 

 margin. On posterolateral margin a small tooth or short spine. 

 Three short posterior spines form a triangle. Outer maxilliped some- 

 what setose, the setae arising between the granules. The segments 

 4-6 of the female abdomen are soldered together; the surface is 

 smooth and glossy about the middle, but there is a transverse 

 tuberculated ridge on the fourth segment and the sixth is sparsely 

 granulate. Segments 3-5 of male abdomen fused.^^ 



Measurements. — Female type, length of carapace 17.9, breadth 15.5 

 mm.; male (55183), length of carapace 13.2, breadth 11 mm. 



Range. — Coasts of Florida; 18 to 50 fathoms. 



Material examined. — See table 64, page 195. 



Genus LEUCOSIA Fabricius 



Leucosia Fabricitts, Supplementum entomologiae sj'stematicae, p. 313, 1798 

 (type not mentioned). — Latreille, Considerations generales sur I'ordre 

 naturel des animaux composant les classes des crustaces . . ., p. 422, 1810 

 (type L. nucleus Fabricius). 



Ilia Leach, Zoological miscellany, vol. 3, p. 19, 1817. — Pesta, Die Decapoden- 

 fauna der Adria, p. 292, 1918. 



Carapace globular, having four spines on posterior half; very 

 exceptionally the rudiment of a fifth spine may be noticed on the 

 posterior half of the carapace. Frontal margin narrow, feebly pro- 

 duced with median indentation forming two blunt teeth. Upper wall 

 of oval orbit open toward the front and bearing two fissures. Basis 

 of second antenna filling the inner orbital fissure. Both pairs of 

 antennae very small. Chelipeds greatly lengthened; palms much 

 longer than wide, swollen at the base, then tapering distally and 

 turning somewhat about the axis, so that the long tliin fingers open 

 in a vertical plane, merus cylindrical and elongate. The following 

 legs much shorter than the chelipeds and decreasing in length con- 

 secutively. Sternal plate oval. Abdomen in both sexes 5-jointed; 

 in the female the last segment abruptly narrowed and pushed up 

 against the maxillipeds. (After Pesta.) 



LEUCOSIA PLANATA (Fabricius) » 



Cancer planatus Fabricius, Entomologia systematica, vol. 2, p. 446, 1793 (type 

 locality, Tierra del Fuego; whereabouts of type unknown); Supplementum 

 entomologiae systematicae, p. 350, 1798. — Bosc, Histoire naturelle des 

 Crustaces, vol. 1, p. 238, 1802. — Latreille, Histoire naturelle . . . des 

 Crustaces et des Insectes, vol. 6, p. 118, 1803. — Lichtenstein, Ges. Naturf. 

 Freunde Berlin Mag., vol. 7, p. 144, 1816. — Milne edwards, Histoire 

 naturelle des Crustaces, vol. 2, p. 139, 1837. 



" Stimpson says that all the segments of the male abdomen except the terminal one are fused. His 

 specimen was smaller than the male measured below. 

 M This species has never been described with enough detail to enable one to place it with certainty. 



