380 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Natal, Rio Grande do Norte, Brazil; June 29, 1899; Branner- 

 Agassiz Exped. ; 6 males, 1 female (25697). 



Plataforma, Bahia, Brazil; 1876-1877; R. Rathbun; 11 males, 5 

 females (40613,40614). 



Porto Seguro, Brazil; Thayer Exped.; 2 males, 1 female (22191). 



UCA MONIUFERA Rathban. 



Plate 132. 



Eiirychelus monilifer L. Agassiz, MS. label. 



Uca monilifera Rathbun, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 120, pi. 9 

 (type-locality, Guaymas, Mexico ; holotype male, Cat. No. 1578, M. C. Z.). 



Diagnosis. — Front very narrow, spatiiliform. Movable finger of 

 large claw widest at middle. Fingers smooth. Carapace without 

 dorsal side-margins. 



Desc7^ption. — Considerably larger than ■maracoa?ii. There is no 

 raised or granulated line bounding the dorsal plane on either side, 

 but the dorsal rounds smoothly into the lateral surface. As in 

 maracoani the anterior margin of the carapace or superior margin of 

 the orbit is transversely sinuous, forming a triangular tooth at the 

 antero-lateral angles, and the front between the eyes is extremely 

 narrov/ and spatuliform, its median furrow linear and not reaching 

 the broadest part of the spatula. 



The lower margin of the orbit is deeply crenated or turreted 

 throughout. 



The large cheliped of the male is much smoother than in the Atlan- 

 tic form. The inner border of the arm has a large laminar expansion 

 directed upw^ard, edge arcuate, denticulate. The wrist is more 

 elongate than in Tnaracoani. The tubercles of the palm are few and 

 indistinct. Fingers quite smooth except at the margins and at the 

 base of the dactylus, where there are a few depressed tubercles. On 

 the immovable finger there is, as in Tnaracoani, a raised line just 

 above the lower margin and continued backward on the palm ; there 

 is, however, no broad lobe or tooth on the proximal half of the pre- 

 hensile edge. The movable finger has a different shape from that of 

 the allied species ; while the upper margin is a regular and moderate 

 curve, the prehensile edge is concave for its basal three-eighths, then 

 straight to near the tip, forming a small tooth at the meeting of the 

 two lines ; this brings the widest part of the finger just proximal to its 

 middle. In maracoani, the widest part of the finger is near its distal 

 third, and the whole of the distal half is much wider than in this 

 species. The spiniform finger tips are not strongly bent in moni- 

 lifera. 



The ambulatory legs are almost bare except the dactyli. 



