108 Bulletin, Vanderhilt Marine Museum, Vol. II 



row of eight sliarp triangulate teeth along the outer edge and a large 

 molar midway the inner surface, which is also furry. 



The first ambulatory legs are spidery thin and reach as far forward 

 as the carpus of the chelipeds. The coxa has a node interlocking with 

 the process of the sternal plate; the basis and ischium are short, the 

 merus is the longest joint of the limb, the carpus elongate, half the 

 length of the propodus which is only a little shorter than the merus, 

 and the dactyl is half as long as the propodus, scimitar-like. The 

 second, third and fourth pairs of ambulatory legs are quite small and 

 successively decrease in size posteriorly. In structure they are replicas 

 of the first ambulatory legs, but the second pair is only a little over 

 half as long as the first. 



Synonymy. — Pericera eutheca Stimpson, Bull. Mus. Comp. Zool., vol. 

 2, p. 112, 1871. — ^A. Milne Edwards, Crust. Reg Mex., pp. 58 and 

 200, pi. 15A, figs. 1 and Ic, 1873. Not Aurivillius K. Sv. Vet. 

 Akad. Hand, vol. 23, pt. 1, p. 55, pi. 2, fig. 1, 1889. 



Macrocoeloma eutheca Miers, Challenger Kept. Zool., vol. XVII, pp. 

 80 and 82, 1886.— M. J. Rathbun, Proc. U. S. Nat. Mus., vol. 15, 

 p. 251, 1892; Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 4, p. 

 257, 1898 ; Bull. 129, U. S. Nat. Mus., p. 484, pi. 170, fig. 1, pi. 171, 

 fig. 1, 1925. 



Macrocoeloma trispinosum (Latreille). 



Plate 33, figs. A, B, C and D. 



Name: Grass crab. 



Diagnostic characters: Carapace subpyriform, tumid; rostral 

 horns slender, long, acuminate, adjacent and subparallel at base, di- 

 vergent distally. Four dorsal prominences, each tipped with a tubercle 

 forming a cross on the carapace, the largest tubercle gastric. Post- 

 lateral angles produced into sharp spines; a sharp, median, upward- 

 pointing spine on the posterior region. Two varieties of this species 

 besides the typical form are known. 



Type: LatreiUe's type came from "Nouvelle Holland" and is de- 

 posited in the Paris Museum. Dr. Rathbun states that this locality 

 is an error, but I think that LatreiUe's locality is correct. In those 

 days the islands of Tobago, St. Eustace, St. Martin's and Saba were 

 entirely or partially under Dutch control, and were frequently re- 

 ferred to as "New Holland." 



