g BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



KEY TO THE SPECIES OP THE GENUS RANINOIDES 



A'. Only one lateral spine on carapace. More than three frontal 

 prominences. 

 B'. Two spines on carpus of cheliped. 



C. A spine at distal end of merus of cheliped. Four spines 

 on lower margin of manus. A spine at base of mobile 

 finger. 

 D'. Lateral tooth not reaching middle of length of outer 



frontal tooth loevis (p. 8) 



D^. Lateral tooth longer, reaching middle of length of outer 



frontal tooth benedicti (p. 9) 



C^. No spine at distal end of merus of cheliped. 



D'. A spine at base of mobile finger. Five or six spines on 



lower margin of manus louisianensis (p. 12) 



D^. No spine at base of mobile finger. Three spines on lower 

 margin of manus. 

 E'. Anterior end of carapace roughly granulate. A well- 

 marked lateral tooth on rostrum ecuadorensis (p. 15) 



E^. Anterior end of carapace smooth to naked ej^e. 



Rostrum laterally angled, not toothed lamarcki (p. 13) 



B^. Only one spine, and that rudimentary, on carpus of cheliped- fossor (p. 16) 

 A^. Two lateral spines on carapace. Only three frontal promi- 

 nences nitidus (p. 16) 



analogous species of raninoides on opposite sides of the continent 



Atlantic Pacific 



loevis. benedicti. 



RANINOIDES LOEVIS (Latreille) 



Figure 3; Plate 1, Figures 1, 2 



Ranina dorsipes Desmarest, Considerations g^n^rales sur la classe des Crustaces, 



p. 140, pi. 19, fig. 2, 1825; not R. dorsipes Lamarck, 1818. 

 Ranina loevis Latreille, Encyclopedie m^thodique. Hist. Nat., vol. 10, p. 268, 



1825 (type locality unknown; type in Paris Mus.). 

 Ranina levis Milne Edwards, Histoire naturelle des Crustaces, vol. 2, p. 197, 1837. 

 Raninoides laevis A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, p. 34, 1880. 

 Raninoides loevis Rathbun, Univ. Iowa Studies Nat. Hist., vol. 9, no. 5, p. 66, 



1921. 

 Raninoides laevis lamarcki Boone, Bull. Vanderbilt Mar. Mus., vol. 2, p. 48 



(part), pi. 9, fig. A, 1930; not R. I. var. lamarcki Milne Edwards and Bouvier, 



1923. 



Diagnosis. — A spine at distal end of menis of cheliped; two spines 

 on carpus; four spines on inner margin of manus; one spine at base of 

 mobile finger. 



Description. — The four sinuses of the front appear longer than they 

 are, owing to their continuance in a narrow gutter. The sinuses bor- 

 dering the 3-toothed rostrum are not parallel but converge posteriorly. 

 The tooth next to the rostrum is spine-tipped, the spine reaching to a 

 line midway between the tip of the median tooth and the tip of the 



