420 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



distal extremity of tiie inferior edge of the propodus, which is ciliated 

 along the rest of its length, while the merus is not ciliated. In Lucas's 

 general figure the propodus is proportionally about a fourth shorter and 

 the dactylus several times as long as in the specimens, the dactylus 

 being very much as in the first three pairs of ambulatory legs ; but the 

 enlarged figure, 1 c, of the terminal portion of the posterior leg is very 

 difterent. The part apparently corresponding to the dactylus in the 

 general figure is represented as composed of two segments, a shorter 

 terminal one like the dactylus in the specimens, and a longer basal one 

 like the terminal part of the propodus. I think there is little doubt that 

 these figures were drawn from a specimen in which the very slender and 

 delicate propodus of the posterior leg was partially broken and bent at 

 about a fourth of the way from the tip to the base, and that the artist 

 mistook the break for a natural articulation, and so represented it. Sup- 

 posing this to be the case,. Lucas's enlarged figure agrees very well with 

 the specimens before me. 



Hoinola barbata White, List Crust. British Museum, p. 55, 1847.— Cancer harhatiis 

 Fabricius, Eutomologia Systematica, ii, p. 4G0, 1793. — Herbst, Krabben niid 

 Krebse, pi. 42, fig. 3. — "Dorippe sphiifrons Lamarck, Animaux sans Vertfebres, 

 T, p. 245, 1818" (Heller). — Homola spinifrom Leach, Trans. Linnean Soc. Lon- 

 don, xi, p. 324, 1815 ; Zoological Miscellany, ii, p. 82, pi. 88, 1815. — Desmarest, 

 Considerat. G^n^rales Crust., p. 134, pi. 17, fig. 1, 1825.— Milne-Edwards, Hist. 

 Nat. Crust., ii, p. 183, pi. 22, figs. 1-4, 1837; Regne Animal de Cuvier, 3'"« 

 6dit., pi. 39, fig. 2. 

 Station 872; 86 fathoms; two males, the larger 19™™ in length of 

 carapax. 



I have had no Mediterranean specimens for comparison, but the two 

 before me agree perfectly with the figures and descriptions above re- 

 ferred to. 



Lyreidus Bairdii, sp. nov. 



Female. — The carapax is regularly and strongly convex transversely, 

 about one and three-fourths times as long as the breadth at the antero- 

 lateral angles, back of which it narrows only slightly for half the length 

 of the lateral margins, which then curve regularly round to the articu- 

 lation with the abdomen. The rostrum, or median tooth of the deei)ly 

 tridentate front, is acutely triangular, the breadth at base being equal 

 to about half the length and greater than the distance between its tip 

 and that of either of the lateral spines, which are spiniform, very acute, 

 and directed forward. The orbital sinuses left between the median and 

 lateral teeth are nearly as deep as broad and broadly rounded behind. 

 The «idge of the antero -lateral margin is rounded, but is armed with a 

 small tubercle about a third of the way from the lateral to the anterior 

 angle, and in front of this tubercle the carapax is suddenly narrowed, 

 so that the margin in front of the tubercle is concave in outline as seen 

 from above. The posterior half of the lateral margin is marked above 

 by a distinct carina, but the anterior half is smoothly rounded. 



The eye-stalks scarcely reach the tips of the lateral teeth of the front, 



