SCYLLARUS. 
SCYLLARUS, Fabricius, 
CANCER, Linneus, Herbst. 
Antenne externe latissime, flabelliformes, pedunculo articulis dilatatis, cristatis. 
Antenne internce quatuor, dissimilimz, medianis filiformibus ; articulo ultimo bifido. 
Oculi distantissimi. 
Testa lata, oblongo-subquadrata. 
Pedum par primum breve, articulis inflatis, manu monodactyli; paria 2, 3, 4, feré consimilia ; par 
ultimum didactyle. 
Abdomen sex-articulatum, segmentis ad latera spinoso-productis. 
Cauda pentaphylla, in lamellis membranaceis terminans, medio transyersi articulata, margine 
articuli primi acutissimé dentato. 
SCYLLARUS ARCTUS. 
ape SOOT VS Bios Oh 345 Ss 
S. testa squamoso-tuberculata, anticé acutissime quadridentata, frontis margine concavo, cristato, 
marginibus lateralibus bidentatis, antennis externis flabelliformibus, acuté dentatis, antice 
lobatis, ciliatis. 
Seyllarus arctus. Fubricius, Ent. Syst. Supp. p. 309, I. 
Cancer arctus. Linneeus, Syst. Nat. 
Cancer (Astacus) Ursa Major. Herbst, II. p. 83, t. 30, f. 2. 
Fig. 2, Scyllaris arctus. 3, fifth claw. 4, first claw. 5, middle claw. 
The name of this curious crustacean was first added to our list of British fauna by Dr. 
Borlase, who found specimens in Mount’s Bay, Cornwall. They have also been not unfrequently 
taken on other parts of our coasts. The more usual order in decapodous crustacea is reversed in 
this case, the first pair of legs being single-clawed, and the last weakly double-clawed. 
