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MARINE BIOLOGY OF THE SUDANESE RED SEA. 
Genus C@NOBITA. 
Ca&NoBITA RUGOSUS, Hdw. 
(Milne-Edwards, 12; Dana, 5; Alcock, 1.) 
Tella Tella Kebira, 7 specimens. 
Family Galatheide. 
Genus GALATHEA. 
GALATHEA HGYPTIACA, Pauls. 
(Paulson, 17 ; Nobili, 14.) 
Off Beacon Island, Khor Dongola, 13 specimens. 
GALATHEA HUMILIS, Nob. 
(Nobili, 14.) 
The specimens described by Nobili were all in bad condition, no ambulatory 
legs being present. The present specimens are also in poor condition, but 
one has got the ambulatory legs present. The characters of the rostrum and 
carapace agree closely with the description and figure given by Nobili. The 
chelipedes seem rather more spiny. 
Ambulatory legs. The dactylopodite has four (or possibly even five) teeth 
inferiorly, the largest next the claw. The propodite has four long spines 
inferiorly, one being almost on the distal border. The coxopodite has no 
spines, the meropodite has two on the inferior surface. 
Off Beacon Island, Khor Dongola, 3 specimens in bad condition. 
Family Porcellanide. 
Genus PETROLISTHES. 
PETROLISTHES BOSCI, Aud. 
(Heller, 9; De Man, 6; Ortmann, 15 6; Nobili, 13.) 
Tella Tella Kebira, 1 specimen, chelipeds missing. 
PETROLISTHES LAMARCKI, Leach. 
A full synonymy of this species and its varieties will be found in 
Borradaile (2). He has pointed out that P. dentatus and P. rufescens are 
only varieties of P. lamarcki. Ortmann (16) and Nobili (44) have also 
shown that there is great variation in this group of forms. The present 
forms belong mainly to the dentatus variety, but the rufescens variety is also 
