12 Annals of the South African Museum. 



Lamarck gives references to others. But Latreille himself in 1802, 

 Hist. Nat. Crust, et Ins., vol. iii., p. 23, defines Portunus, with 

 "Exemple. Portunus depurator, Fab.," and without mention of any 

 other species. Judging by his later writings, I cannot suppose that 

 either in 1802 or 1810 he had any intention to restrict the genus 

 when naming an "exemple" or "type." But if he did it accidentally, 

 surely the accident happened in 1802, and made P. depurator the 

 typical species. In his Cours d'Entomologie, pp. 349, 350, in 1831 

 Latreille's references to Portunus piiber and Lupa pelagica make it 

 clear that he was himself unaware of having done anything to make 

 the latter species a Portunus in preference to the former. 



LUPA PELAGICA (Linn.). 



1758. Cancer pelagicus, Linn., Syst. Nat., ed. 10, p. 626. 

 1798. Portunus pelagicus, Fabricius, Suppl. Ent. Syst., p. 367. 

 1813. Lupa pelagica, Leach, Edinb. Encycl., vol. vii., p. 390. 

 1899. Neptunus pelagicus, Alcock, Journ. Asiat. Soc. Bengal, 



vol. IxviiL, pt. 2, p. 34. 

 1907. Portunus pelagicus, M. J. Eathbun, notes to Stimpson's North 



Pacific Crust., Smithsonian Misc. Coll., vol. xlix., p. 76. 



A dry specimen of this well-known species from the Durban 

 Museum measured 150 mm. in extreme breadth of the carapace. 



CATOMETOPA. 



FAMILY GEAPSID^. 



1900. Grapsidce, Alcock, Journ. Asiat. Soc. Bengal, vol. Ixix., pt. 2, 

 pp. 283, 389. 



GEN. GEAPSUS, Lamarck. 



1801. Grapsus, Lamarck, Syst. Anim. sans vertebres, p. 150. 

 1900. Grapsus, Alcock, Journ. Asiat. Soc. Bengal, vol. Ixix., pt. 2, 

 pp. 389, 390. 



Lamarck's original definition of the genus is : " Pour antennae, 

 short, articulated, concealed beneath the carapace. The eyes at 

 the angles of the carapace, with short peduncles. Body depressed, 

 almost square, carapace transverse, deflexed in front. Ten feet, 

 unguiculate : the anterior pair chelate." He bases it upon Cancer 

 grapsus, Linn., for which he substitutes the new designation Grapsus 



