CONTRIBUTIONS TO MARINE BIONOMICS. 407 
be accounted for, but their absence in Portumnus latipes. The elucida- 
tion of those features will be attempted in a subsequent article dealing 
with the habits of the latter species. 
In conclusion I may add that a good figure of P. nasutus is given in 
Costa’s classical memoir on the fauna of the Bay of Naples (1853). 
BIBLIOGRAPHY. 
Bell, T.—l.c. (1853). 
Carus, J. Victor.—Prodromus Faune Mediterranee. Stuttgart, 1885. 
Costa, O. G.— Fauna del Regno di Napolt, 1836. Addizioni w Decapodi Brachiuri, 
February, 1853, pp. 14, 15, Tav. 6, fig. 4. 
Dana, J. D.—‘‘ Crustacea.” U.S. Exploring Expedition, vol. xiii. 1852. 
Garstang, W.—1. “The Habits and Respiratory Mechanism of Corystes cassi- 
velaunus.” This Journal, iv. pp. 228-232. 1896. 
- 2. “On the Function of certain Diagnostic Characters of Decapod 
Crustacea.” Rep. Brit. Ass. Liverpool, 1896, pp. 828-830. 
Latreille, M.—1. Nowv. Dict. d’Hist. Nat. 1818. 
5 2. Encycl. Méthodique, x. 1825. 
Leach, W. E.—1. Trans. Linn. Soc., xi. pp. 306-400. 1815. 
6 2. Malac. Podoph. Brit. 1815. 
Milne-Edwards, H.—Hist. Nat. des Crustacés. 1834. 
Risso, M.— Hist. Nat. des Crustacés des environs de Nice. 1816 (Plate L, fig. 2). 
