188 Notes on North American Crustacea, 



IVIithrax aculeatns. 



Cancer aculeatus Herbst, Nat. d. Krabben und Krebse, pi. xix. t. 104. 

 Mithrax aculeatus M. Edw., Hist. Nat. des Crust, i. p. 321. 



This is a setose species, to which the name hispidus would 

 apply much better than to the species called by that name. It is 

 shorter and broader than 3L spinosissimus, and belongs to the 

 same group with 3L verrucosus, having the basal joint of the 

 antennae three-spin ed ; the spines sharp. Carapax covered 

 with depressed granules, much crowded ; marginal spines 

 sharp, sometimes armed with a supplementary spinule or two 

 near their tips. Hands more or less spinose above near the 

 base. 



It has been found at the Tortugas, at Aspinwall, at St. 

 Thomas, and at Barbados. 



IVIifhrai: spinosissimus. 



Maia spinosissima Lamk. An. sans Vert. v. 241. 

 Mithrax spinosissimus M. Edw., Mag. de Zool., i. 321, pi. 2, 3. 

 Gibbes, Proc. Am. Assoc. 1850, p. 372. 



This is the largest species of the genus. The carapax is mar- 

 gined with spines bifurcated at their tips. Basal joint of the 

 antennae broad, two-spined. Horns of the rostrum rather 

 longer than in other species. Superior margin of the hand 

 spinulose towards the base. 



It is very abundant on the Florida Keys, from Key Bia- 

 cayne southward. 



mithrax hispid us. 



Cancer hispidus Herbst., Nat. d. Krabben und Krebse, pi. rviii., f. 



100. 

 Maia spinicincta Lamk. 

 Mithrax spinicinctus Desm., p. 150, pi. xxin., f. 1, 2. 



