204 Notes on North American Crustacea. 



In this species there is some approach to excavation in the 

 tips of the fingers, that would perhaps require its removal to 

 the section Actaeodes of Dana, which, however, we can scarcely 

 consider a distinct generic group. 



Found at Cape St. Lucas, by Mr. Xantus. 



Actaea labyriiithica, nov. sp. 



This species is very closely allied to the Atlantic species, A- 

 erosa Stm., difl'ering only in being less minutely eroded or 

 vermiculated, the prominent parts between the principal furrows 

 of erosion being flattened and smooth ; while in A. efosa these 

 prominences are sharp and themselves eroded. On the outer 

 surface of the hands the prominences are smooth, mammilli- 

 form tubercles. 



In color this crab is variegated with yellow and carmine. 

 Length of the carapax in a female, 1.0 ; breadth, 1.42 inch. 



Found at Panama, by the Kev. J. Kowell. For additional 

 specimens I am indebted to Mr. "W. II. Edwards. 



Xantho bella, nov. sp. 



PL III., fig. 2. 



Carapax rather broad ; proportion of length to breadth about 1:1.50. 

 It is somewhat octagonal in shape, the antero-lateral margin being- 

 angular at the middle, where it is divided into two equal portions ; — the 

 anterior one straight, oblique, and entire, with the exception of a small 

 lobe scarcely projecting near its anterior extremity ; and the posterior 

 portion nearly longitudinal, and armed with three strong triangular 

 teeth, the middle one being most prominent. The postero-lateral mar- 

 gin is longer than the antero-lateral. Surface distinctly areolated, 

 smooth, and glabrous, except near the anterior margins, where it is 

 minutely rugose or granulated. Front moderately projecting, deeply 

 fissured at the middle. The infero-external fissure of the orbit is as well 

 marked as in X. Jlorida^ or as in some Panopei. Chelipeds smooth 



