ORTMANN : TERTIARY INVERTEBRATES. 
255 
Distribution : Living from Tierra del Fuego along the western coast of 
America to California, and along the eastern coast to Brazil (Darw., 
Weltn.). Fossil in the Pliocene Coquimbo beds of Chili (Sow., Darw., 
Phil.), and subrecent in Peru (Darw.). 
Decapoda. 
Fam. CARCINOPLACIDAB Ortm. 
Gen. GERYON Kroy. 
180. Geryon (?) peruvianus (d’Orbigny). 
PI. XXXVIII, Fig. 6“’ 6 . 
1842 Portunus peruvianus d’Orbigny, in: Voy. Amer. merid., v. 3, p. 107, 
pi. 6, f. 17. 
i860 Carcinus p. A. Milne-Edwards, in: Annal. Sci. natur., ser. 4, v. 14, p. 
*2.69, pi. 8. 
1887 Cancer patagonicus Philippi, Tert. & Quart. Verst. Chiles, p. 220, pi. 
50, f. 1. 
1900 Geryon (?) peruvianus Ortmann, in : Amer. Journ. Sci., v. 10, p. 381. 
Carapace with the regions hardly distinguishable, subpentagonal, sur- 
face finely granulated. Front with four tooth-like lobes. Orbits trans- 
verse, each a little broader than the front, with a closed fissure in the 
upper margin. Antero-lateral margin curved, a little shorter than the 
straight postero-lateral margin, with 5 teeth, the first of which is the extra- 
orbital tooth ; teeth conical, pointed, separated by broad, concave inter- 
vals. Sternum broadly oval. Abdomen of the male triangular, that of 
the female ovate. Third maxilliped of the usual Brachyuran type, with an 
almost quadrate meropodite, at the anterior inner angle of which the car- 
popodite is inserted, and with a well-developed exopodite. First pair of 
pereiopods strong, a little unequal ; meropodite triangular, stout ; carpo- 
podite short and stout, with a tooth on the inner side ; hand elongate- 
oval, fingers strong, a little shorter than the palm, with inner edges 
strongly dentate. Meropodite of the 4 posterior pairs of pereiopods 
strong and rather elongate, compressed, with a blunt edge on the upper 
margin. 
