South African Crustacea. 9 



much longer, than any of the legs, the first three pairs of which have 

 a tendency to be slender and the last pair of which end in typical 

 swimming-paddles ; the antero-lateral borders of the carapace are 

 cut into from 5 (very rarely 4) to 9 distinct teeth. The carapace 

 may be subrotund, but it is usually conspicuously broad." 



The sub-family is subdivided into three alliances Lupoida, 

 Podophthalmoida, and Lupocycloida the first of which includes, 

 among others, the genera with which we are here concerned. 



GEN. CHAEYBDIS, de Haan. 



1902. Chary bdis, Stebbing, South African Crustacea, pt. 2, p. 9. 

 The synonymy has been already given under the reference cited. 



CHARYBDIS NATATOR (Herbst). 

 Plates XXVIII. and XXIX. 



1794. Cancer natator, Herbst, Naturg. Krabben u. Krebse, vol. ii., 

 pt. 5, p. 156, pi. 40, fig. 1. 



1834. Thalamita natator, Milne-Edwards, Hist. Nat. Crust., vol. i., 



p. 463, pi. 17, figs. 13, 14. 



1835. Portunus (Charybdis) granulatus, de Haan, Crust. Japon., 



decas secunda, p. 42, pi. 1, fig. 1. 



1843. Charybdis granulatus, Krauss, Siidafrik. Crust., p. 24. 

 1899. Charybdis (Goniosoma) natator, Alcock, Journ. Asiat. Soc. 



Bengal, vol. Ixviii., pt. 2, pp. 50, 61. 

 1907. Charybdis natator, M. J. Eathbun, notes to Stimpson's 



North Pacific Crust., Smithsonian Misc. Coll., vol. xlix., 



p. 82. 



Under the last reference but one will be found a full synonymy of 

 the species to date, and a description with which the specimen from 

 the Durban Museum seems fully to agree, except in a single par- 

 ticular, probably connected with the exceptional size of the example 

 captured at Durban. Alcock states that the fingers of the chelipeds 

 are about as long as the hand, and says with regard to eleven 

 specimens in the Indian Museum that in the largest specimens the 

 carapace is about 70 mm. long and about 100 mm. broad. Our 

 specimen is 80 mm. long and 113 mm. broad. The hand measured 

 along the lower margin is 133 mm. in length, of which 58 mm. 

 belongs to the thumb, leaving 75 mm. for the palm. On the upper 

 margin the palm is only 60 mm. long, and the movable finger is 

 63 mm., but in general effect the palm of this specimen might be 



