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420 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
distal extremity of the 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 ¢, of the terminal portion of the posterior leg is very 
different. 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. 
Homola barbata White, List Crust. British Museum, p. 55, 1847.—Cancer barbatus 
Fabricius, Entomologia Systematica, ii, p. 460, 1793.—Herbst, Krabben und 
Krebse, pl. 42, fig. 3.—‘‘Dorippe spinifrons Lamarck, Animaux sans Vertébres, 
v, p. 245, 1818” (Heller).—Homola spinifrons Leach, Trans. Linnean Soc. Lon- 
don, xi, p. 324, 1815; Zoological Miscellany, ii, p. 82, pl. 88, 1815.—Desmarest, 
Considérat. Générales Crust., p. 134, pl. 17, fig. 1, 1825.—Milne-Edwards, Hist. 
Nat. Crust., ii, p. 183, pl. 22, figs. 1-4, 1837; Regne Animal de Cuvier, 3™° 
édit., pl. 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- 
terred 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 deeply 
tridentate front, is acutely triangular, the breadth at base being equal 
to about half the length and greater than the distance between its tip 
aud 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 edge 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, 
