4 BRACHYURA.—RATHBUN. 
-MEGALOPS STAGE OF CrAB, THE ADULT oF WuicH Is UNKNOWN. 
Marestia Dana. 
MARESTIA MAWSONI, new species. 
(Fig. 1, a-h.) 
Type locality.—Surface, off coast Macquarie Island, May 20, 1912; 5 specimens, 
accidentally dried in transportation. 
Size.—Length of carapace on median line, 7 mm. 
Description.—Resembles M, atlantica Dana,* the carapace being narrowed 
anteriorly, and flattened. The edge of the front, seen from above, has a similar indenta- 
tion, but it is U-shaped, not V-shaped. The rostrum is vertical and has a rounded instead 
of a pointed tip. The upper margin of the orbit has a thin edge, and the adjacent 
carapace is depressed and furrowed. The large eyes have a large terminal cornea. 
Terminal segment of abdomen broader than long, margin arcuate and entire. 
Chelipeds short, stout; upper edge of merus acute, very finely serrulate; carpus 
rounded, finely roughened, a depression near middle of outer surface; chela thick; 
palm flattened above, outer surface with 2 or 3 shallow, longitudinal depressions on the 
upper two-thirds, intervening ridges finely roughened; fingers irregularly toothed, 
crossing at tips, narrowly gaping at base, a slender tooth projecting from the dactylus 
into the gape. Ambulatory legs similar to those of aélantica; dactyli armed with 6 or 7 
uneven spines, the fifth spine from the proximal end being the longest; the dactyli of 
the last pair have at the extremity 4 long sete. 
*Crustacea U.S. Expl. Exped., Vol. 1, 1852, p. 489 ; atlas, 1855, pl. XXXI, figs. 3a—3y. 
