CANCROIDEA. 



271 



species Lupa forceps. We retain it for the typical part of the old 

 genus, as good usage if not law requires. The Lupa forceps hardly 

 differs enough from Amphitrite, another subdivision of the old genus 

 Lupa, to be distinguished as the type of a separate genus. This 

 genus corresponds in the main to De Haan's Neptunus. 



Lupa pelagica (Linn.) 

 Singapore, East Indies. 



Length of the carapax of a medium specimen, one inch and four 

 lines ; breadth between tips of longest lateral spines, two inches and 

 eleven lines; ratio of length to breadth, 1:2-2; breadth between teeth 

 next in advance, two inches and four lines; ratio of length to this 

 breadth, 1 : 1'75. 



Cancer pelagicus, Linn., Mus. Lud. Ulr., p. 434. 



Lupa pelagica, Leach, Ediob. Encyc; Edwards, Crust., i. 450. 



Lupa sanguinolenta (Herost), Desm. 



Singapore, East Indies; also Sandwich Islands. 



Length of carapax of a male, two inches and four lines ; breadth 

 between extremities of lateral spines, five inches and four lines ; ratio 

 of length to this breadth, 1:2-3; breadth between the two teeth next 

 anterior to the spine, four inches and four lines ; ratio of length to 

 this breadth, 1 : 1*86. Third joint of exterior maxillipeds and ptery- 

 gostomian region densely pubescent, while the same parts in the dican- 

 tlia are naked ; second joint of exterior maxillipeds naked and smooth. 

 Teeth of fingers compressed incisors, each being supported on either 

 side by a very small tooth or lobe ; one basal tooth of moveable 

 finger of larger hand, flattened molar in form. 



Colour of living animal, yellowish gray with a tinge of green, and 

 large brown areolation ; large spots behind brown with a white ring 

 around. Extremity of posterior eight legs blue, with red ciliation j 



