REPORT OF THE BRACHYURA. 
79 
Macrocceloma, Miers. 
Macrocceloma, Miers, Jonrn. Linn. Soc. Lond. (Zool.), vol. xiv. p. 665, 1879. 
Pericera (part) audorum. 
The carapace is rather convex, usually broadest at the branchial regions, with the 
orbits tubular and laterally projecting; the interorbital space broad; the dorsal surface 
unarmed or tuberculated, or wfith a few long spines ; the margins without a series of 
elongated lateral spines as in Pericera, but often with a strongly developed lateral epi- 
branchial spine, preceded sometimes by some smaller spines ; the prseocular spine or 
tooth is small. The spines of the rostrum are well developed. The post- abdomen in 
the male is distinctly seven-jointed (in the species I have examined). The eyes are 
usually completely retractile within the small tubular orbits. The antennse have the 
basal joint considerably enlarged and armed with a spine on the distal margin, which is 
usually visible in a dorsal view, and sometimes with another placed immediately beneath 
the first (mobile) joint ; the mobile part of the antenna is sometimes concealed in a dorsal 
view by the rostral spines, sometimes visible at their sides; the merus of the exterior 
maxillipedes is distally truncated, with the antero-internal angle emarginate. The 
palms of the chelipedes are either somewhat elongated and compressed or shorter and 
more dilated ; fingers with or without an intermarginal hiatus. The ambulatory legs are 
rather short and moderately robust; dactyli slightly curved. 
The following species are referable to this genus : — 
1. Lateral epibranchial spines well developed : — 
Macrocceloma trispinosa (Latreille) = Pericera nodipes, Desbonne and Schramm. 
West Indies; Bermuda; Bahia. 
Macrocceloma diacantha ( A. Milne Edwards). Majores (to 12 fathoms). 
Macrocceloma camptocera (Stimpson). Florida Straits. 
Macrocceloma heptacantha (Bell). Central America, Puerto Portrero. 
Macrocceloma septemspinosa (Stimpson). West of the Tortugas (to 36 
fathoms) ; Bahia. 
Macrocceloma villosa (Bell) = Pericera fossata, Stimpson. California, Cape St. 
Lucas ; Ecuador, Gulf of Guyaquil. 
Macrocceloma subparallela (Stimps.) = Pericera vilpini, Desbonne and 
Schramm. St. Thomas ; Guadaloupe. 
Macrocceloma diplacantha (Stimpson). St. Thomas. 
Macrocceloma trigona (Dana). Fiji Islands. 
Macrocceloma concava, n. sp. Bahia ; Fernando Noronha (7 to 20 fathoms). 
