88 IOWA STUDIES IN NATURAL HISTORY | 
chelipeds, which because of the armature of the first abdominal 
somite are placed here. 
Family Porcellanide 
Petrolisthes galathinus (Bosc) 
Porcellana galathina Bose, Hist. Nat. Crust., I 1802, p. 233, pl. 6, fig. 2. 
Petrolistiies sexspinosus Rathbun, Ann. Inst. Jamaica, I, no. 1 (1897), 
p. 40.—Proc. Wash. Acad. Sci., II (1900), p. 145.—Benedict, Bull. 
U. S. Fish Comm., XX, pt. 2, 1900 (1901), p. 133. 
Petrolisthes galathinus Rathbun, Rapport van de Visscherij en de In- 
dustrie van Zeeproducten in de Kolonie Curagao, uitgebracht door 
Prof. Dr. J. Boeke, pt. 2 (1920), p. 327 [11]—Milne-Edwards and 
Bouvier, Mem. Mus. Comp. Zool., XLVII, no. 4 (1923), p. 289, pl. 1, 
figs. 1, 2. 
D.S. 20; 12 ovig. Okra Reef, May 18; 6 (2 ovig.). Bar- 
bados, May 15; one specimen. Barbados, May 22; one spec- 
imen. Old coral, May 31; 2 (1 ovig.). 
Off the Castle, E. side Barbados; one specimen. 
Petrolisthes tridentatus Stimpson 
Petrolisthes tridentatus Stimpson, Ann. Lyc. Nat. Hist. N. Y., VII, 1859 
(1860), p. 75 [29], pl. 1, fig. 4—Benedict, Bull. U. S. Fish Comm., 
XX, pt. 2, 1900 (1901), p. 134, pl. 3, fig. 2—Milne-Edwards and 
Bouvier, Mem. Mus. Comp. Zool., XLVII, no. 4 (1923), p. 291. 
Needham’s Point, Barbados; two specimens. English Harbor ; 
4 (3 ovig.). Pillars of Hereules, English Harbor; 3 (1 ovig.). 
Petrolisthes marginatus Stimpson 
Petrolisthes marginatus Stimpson, Ann. Lye. Nat. Hist. N. Y., VII, 1859 
(1860), p. 74 [28].—Benedict, Bull. U. S. Fish Comm., XX, pt. 2, 
1900 (1901), p. 134, pl. 3, fig. 1. 
Okra Reef, Barbados, May 18; 4 (2 ovig.). Barbados, May 
15; 8 (3 ovig.). Barbados, old coral, May 31; 3 (2 ovig.). Bar- 
bados, from coral heads, June 4; two specimens. 
In alcohol, salmon color marked with reddish flecks usually 
along margins and on tubercles of chelipeds. Legs more or less 
banded with red, one on propodus, two on carpus, with red 
fleck, rather spot, on upper anterior margin of merus. 
Petrolisthes jugosus Streets 
Petrolisthes jugosus Streets, Proc. Acad. Nat. Sci. Phila.. XXIV (1872), 
p. 134.—Benedict, Bull. U. 8. Fish Comm., XX, pt. 2, 1900 (1901), 
p. 134. 
D.S. 1, May 138; 2 (1 ovig.). Okra reef, Barbados, May 13; 
1? ovig. Barbados, May 15; 19 (13 ovig.). Old Coral, Bar- 
