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U. acuta (Stimpson) has been shown by Miss Rathbux to be identical with U. dus- 

 siimieri H. Milne-Edwards, and she has altered^) accordingly de Man's " Gelasiimis' acutus") 

 into Uca manii, but I am doubtful about the admissibility of this latter name, two species 

 within the same genus now having been called after Dr. J. G. de Man. 



The new species, save U. novaeguinea, belong to the narrow- fronted species. With regard 

 to U. rathbunae, I am inclined to regard it, after careful study of Pearse's description and 

 figures, identical with U. coardata (H. Milne-Edwards)^). Both species agree exactly, not only 

 in the shape of the larger chela and the row of tubercles on the lower wall of the orbit, but 

 also with respect to the relative length of the carapace, as in both species this length is 6o7o 

 of the distance between the external orbital angles *). Pearse says, that, on his request. Miss 

 Rathbun herself has carefully compared his specimens with specimens of 13 narrow-fronted 

 species from the Indo-Pacific region in the United States National Museum (perhaps U. coardata 

 was not among the latter), and as the result of this study the specimens were declared to 

 represent a new species, most nearly related to U. urvillei (H. Milne-Edwards). 



I. Uca marionis Desmarest. 



Synonymy and description: DE Man, Abhandl. Senckenb. Ges., Bd 25, Heft 3, 1902, p. 487 

 and Notes Leyden JMus., v. 13, 1891, p. 23, pi. 2, f. S^5«; Thallwitz, Abhandl. Mus. 

 Dresden, Bd 3, n" 3, 1890 91, p. 42. 



Stat. 86. Dongala, west coast of Celebes. 4 cf, 2 9- 

 Stat. 115. Kwandang Bay, north coast of Celebes. 3 cf. 

 Stat. 131. Karakelang, Talaut Islands. 5 (^. 



The considerable variation shown in the larger chela of the cT has induced earlier authors 

 to discriminate .several species that, however, are now all united into one. In the most common 

 form the immovable finger bears two large, triangular and compressed teeth in the distal half. 

 This is the subsp. excisa Xobili '"), formerly called Gelasimus mtidtis by Dana *'), but the latter 

 name had been used by Desmarest already for a fossil species. A good figure of the chela 

 is given by de M.\n (I.e., 1891, pi. 2, f. 5). 



In another modification the triangular tooth near the middle of the fixed finger becomes 

 lower and lower; the finger itself is less curved upward and more straight than in excisa. This 

 subspecies is the ailtrimana White '), the chela of which has been well figured by H. Milne- 

 Edwards (Ann. Sc. Nat. (3) t. iS, 1852, pi. 3, f. 4^), by Kingslev (Proc. Ac. Nat. Sc. Philadelphia, 

 1880, pi. 9, f. 7) and especially by de Man (I.e. pi. 2, f. 5a). 



1) Proc. Biol. Soc. Washington, v. 22, 1909, p. 114. 



2) Journ. Linn. Soc. London, v. 22, 1888, p. 113, pi. 7, f. S— 9, pi. 8, f. I — 4. 



3) Ann. Sc. Nat. (3) t. 18, 1852, p. 146, pi. 3, f. 6. It is true, that this species has been origin.-illy recorded from Odessa on 

 the Black Sea, but this locality seems, to say the least, most doubtful. Besides, I had an opportunity to examine undoubted specimens 

 of V. coardata from Nias, that belong to the Amsterdam Zoological Museum and were collected by Dr. P. J. Kleiweg de Zw.\an in 

 1910, and to compare these with the very specimens of de Man (I.e. iSgi). 



4) 557o in U. ui-uilUi. 



5) Ann. Sc. Nat. (9) t. 4, 1906, p. 315. 



6) Crust. U.S. Expl. Exp., 1852, p. 316, pi. 19, f. 5. 



7) Proc. Zool. Soc. London, 1847, p. 84. 



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