484 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



spine; further back a small blunt spine. On the lower surface of the 

 carapace an acute spine just outside the basal segment of the antenna, 

 and a row of three tubercles on the pterygostomian region. 



The merus of the chelipeds has a row of conical spines above and 

 a row of tubercles on the outer surface and the lower, outer margin. 

 Carpus tuberculate, manus smooth, digits gaping in their basal third 

 or two-fifths. 



Color. — Yellowish (Desbonne); hands crimson, distal half of 

 fingers black except the tips which are white (Stimpson). 



Measurement. — Male (46933), length of carapace 25, length of 

 horn 5.8, width of carapace 14 mm. 



Range. — Florida Keys; West Indies. 



Material examined. — 



Florida: Hawk Channel; 3^ mile SE. by S. of SE. end of Duck 

 Key; 14 feet; rky. ; January 27, 1903; station 7429, Fish Hawk; 1 

 male (46933). 



Cuba; 1914; Henderson and Bartsch, Tomas 5arrera Expedition: 

 Between Cape San Antonio and Cape Cajon; 2 to 12 fathoms; on 

 bottom varying from pure sand to weedy; station 12; 1 female 

 (48740). Bahia Honda; June 7; 1 female (48673). 



Jamaica: Port Antonio; J. E. Duerden, collector; Institute of 

 Jamaica; 1 male (21235). 



St. Thomas; 2 small males (Copenhagen Mus.). 



Guadeloupe; Saussure; 1 male, 1 female (Geneva Mus.). 



MACROCOELOMA EUTHECA (Stimpson) 



Plate 170, fig. 1; plate 171, fig. 1 



Pericera eutheca Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 112 

 (type-localities, off French Reef, 15 fathoms, and west of Tortugas, 37 

 fathoms; types not extant). — A. Milne Edwards, Crust. Reg. Mex., 

 1873, pp. 58 and 200, pi. 15A, figs. 1-lc. Not Aurivillius, K. Sv. Vet.- 

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



Macrocoeloma eutheca Miers, Challenger Rept., Zool., vol. 17, 1886, pp. 80 

 and 82.— Not Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 251.— 

 Rathbtjn, Bull. Labor. Nat. Hist. State Univ. Iowa, vol. 4, 1898, p. 257. 



Diagnosis. — Rostral spines separated by a U-shaped sinus. Cara- 

 pace much constricted behind orbits. Orbital tubes very long. 



Description. — Carapace subtrapezoidal, very narrow behind orbits. 

 A spine on gastric, cardiac and intestinal prominences, a spinule 

 at summit of branchial region, and one strong spine at lateral angle, 

 directed outward and backward, and in line with cardiac spine. 

 Rostrum small, horns slender, parallel for at least one-half their 

 length, interspace U-shaped, tips slightly divergent. Orbital sheath 

 directed obliquely forward, upward and outward, and prolonged well 

 beyond the ventral face of the basal antennal article; its margin is 



