W. RIDDELL—ANOMURA. 263 
represented. The epibranchial spine, as Ortmann has shown, is very 
variable. In two specimens, otherwise alike, the epibranchial spine was 
absent in one, present in the other. 
Suez mud flats, 11 specimens ; among coral, Suez, 29; Tella Tella 
Kebira, 10 ; Suez Bay, 5 ; no locality given, l. 
PETROLISTHES LEPTOCHELES, [Teller. 
(Heller, 9; Nobili, 14.) 
Coral, Suez, 2 specimens; coral, Suakin, 1; Suez flats, 2; Tella Tella 
Kebira, 1 ; Khor Dongola, 4 ; no locality given, 2. 
Genus PoLyonyx. 
POLYONYX DENTICULATUS, Paulson. , 
(Paulson, 17; Nobili, 14.) 
Suakin Harbour, 3 specimens; Suez Bay, 6; Hngineer’s Island, Khor 
Dongola, 6 ; “Among sponges, Jan. 11th, 1905,” 88 ; washings from 
Sothhe 44,2 1, 
PoLYONYX BIUNGUICULATUS, Dana. 
(Dana, 5.) 
Beacon Island, Khor Dongola, 1 specimen. 
Genus PACHYCHELES. 
PACHYCHELES SCULPTUS, dw. 
(Milne-Edwards, 12; De Man, 6; Ortmann, 16; N obili, 13.) 
Tella Tella Kebira, 1 specimen. 
Genus PORCELLANA. 
PoRCELLANA INZQUALIS, Heller. 
(Heller, 9; Nobili, 13, 14.) 
According to Heller, the right cheliped is the larger ; according to Nobili, 
the right generally, sometimes the left. In the present specimens the right, 
on the whole, is most often the smaller. They may be subequal. Nobili 
says that in his specimens the median lobe of the front was broadly rounded, 
and that none of them corresponded to Heller’s figure, which represents the 
lobe as acute. In the present specimens this lobe is usually more or less 
acute, not so acute as Heller figures it, but more so than Nobili shows it. 
Reef flat, Engineer Island, Khor Dongola, 54 specimens; Tella Tella 
Kebira, 53 ; off Beacon Island, Khor Dongola, 42. 
