70 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



and reinforces the dactyl, which is deeply concave on the outer lat- 

 eral margin, with the tip rounded and both lateral margins setose; 

 the fourth leg has the propodus less produced and the dactyl rather 

 thick on the anterior lateral margin, tapering distally and forming 

 a stocky triangle. 



The fifth legs are quite long and slender and fold inside the 

 branchial cavity; the ischium and merus are quite long, subequal; 

 the carpus three-fourths as long as the merus ; the propodus not quite 

 as long as the carpus, slender, it and the dactyl forming a perfect 

 small chelae, with a heavy brush of setae on each finger. 



The present specimen is carrying about 300 small, spherical eggs, 

 attached to the long, slender, ciliated abdominal appendages. 

 Synonymy. — Hippa emerita Milne Edwards and Lucas, Crust, in 



D'Orbigny's Voy. Mer. Merid., vol. 6, p. 32, 1843 ; Nicolet, Crust. 



in Gay, Hist. Chile, vol. 3, p. 185, 1849. — DeSaussure, Rev. et 



Mag. ZooL, vol. 5, p. 367, 1853 (not Edwards). 

 Eippa talpoides Dana, U. S. Explor. Exped., vol. 13, Crust., p. 409, 



pi. 25, fig. 10, 1852 ; Proc. Acad. Nat. Sci. Phila., vol. 7, p. 175, 



1854 (not Say). 

 Hippa analoga Stimpson, Proc. Boston Soc. Nat. Hist., vol. 6, p. 



486, 1857. — MiERS, Journ. Linn. Soc. London, ZooL, vol. 



14, p. 324, pi. 5, fig. 10, 1879.— Ortmann, Zool. Jahrb. f. Syst., 



vol. 6, p. 537, pi. 26, fig. 1, 1892; Holmes, Occas. Papers Calif. 



Acad. Sci., vol. 7, p. 103, 1900. 

 Emerita analoga Rathbun, M. J., Harriman Alaska Exped., vol. 10, 



Crust., p. 168, 1904. — Weymouth and Richardson, Smiths. Misc. 



Coll., vol. 59, No. 7, 1812.— Mead, Univ. CaUf. Publ. in Zool., vol. 



16, p. 431, 1917.— ScHMiTT, idem, vol. 23, p. 173, fig. 19, 1921. 



Family : PORCELLANIDAE. 



Genus: PISOSOMA Stimpson. 



Pisosoma angustifrons Benedict. 



Plate 18. 



Diagnostic characters: Chelipeds unequal, the right being the 

 larger ; carpus evenly paved with granules ; anterior margin with four 

 teeth, the distal one of which is normally bifid; two prominent rows 

 of granules on the palm. The carapace is wider than long, the an- 

 terior margin but little arcuate, the branchial regions roughened with 

 transverse rugae. 



