172 BULLETIN 1G6, UNITED STATES NATIONAL MUSEUM 



A^, No protuberance on median line of intestinal region. 



B'. A smooth cap on rostrum and round plate on hepatic region.minuta (p. 179) 

 B^. No smooth cap on rostrum nor round plate on hepatic region. 

 C. Four posterior lobes on carapace. Tubercles mushroom- 

 shaped agaricias (p. 178) 



C^. No posterior lobes on carapace. Margin of efferent channel 



trilobed curacaoensis (p. 182) 



RANDALLIA ORNATA (Bandall) 



Plate 49, Figures 1, 2 



Ilia ornata Randall, Journ. Acad. Nat. Sci. Philadelphia, vol. 8, p. 129, 1839 

 (type locality, California; type not extant). 



Guaia ornaia Gibbes, Proc. Amer. Assoc. Adv. Sci., vol. 3, p. 186 [22], 1850. 



Randallia ornata Stimpson, Proc. Boston Soc. Nat. Hist., vol. 6, p. 85, 1857; 

 Boston Journ. Nat. Hist., vol. 6, p. 471 (31), pi. 20 (not 19), fig. 3, 1857; 

 Ann. Lye. Nat. Hist. New York, vol. 7, p. 69 [23J, 1859.— Weymouth, 

 Stanford Univ. Publ., Univ. Ser. no. 4, p. IS, pi. 1, fig. 3, 1910.— Schmitt, 

 Univ. California Publ. Zool., vol. 23, p. 188, fig. 116, 1921. 



Diagnosis. — Carapace distinctly longer than wide. Carapace gran- 

 ulate. Brancliiohepatic groove shallow. Two pairs of posterior 

 protuberances triangular, acute. 



Description. — Carapace slightly longer than broad ; generally smooth 

 to the naked eye but very finely granulated; posterior margin promi- 

 nent, coarsely granulate and armed with two short, stout spines; 

 above, a row of three very short, distant spines or tubercles, one in- 

 testinal, the others branchial. A row of pits defines the branchial 

 region. Hepatic region angular, forming on obtuse tooth below; on 

 the subhepatic or pterygostomian region there is a long, shallow, blunt 

 lobe and behind these, but on an intermediate level, a row of three, 

 or sometimes more, small anterolateral tubercles not far apart. An- 

 terior part of carapace with a blunt median carina. Frontal teeth 

 high, coarsely granulate. Basal article of antennule thin, cristate, 

 forming an operculum covering half the fossa. Prolongation of septum 

 of branchial channel trilobed. Chelipeds of male one and one-half 

 times as long as carapace; merus rough with coarse granules; manus 

 broad and thick, like the carapace smooth to naked eye; dactylus 

 somewhat longer. Abdomen, segments 3-5 fused, 1 and 2 granulate, 

 2 with a spinule at either end. 



In the young, granules are coarser and crowded, unequal in size. 

 This feature is sometimes continued in larger specimens up to 33 mm 

 long (immature female, 5167). 



Color. — Carapace variegated with sanguineous spots, confluent an- 

 teriorly; chelipeds variegated with red. 



Measurements. — Male (3101), length of carapace 56, width 53.2 

 mm. 



Range. — From Mendocino County, Calif., to Magdalena Bay, 

 Lower California, Mexico; 5]^ to 51 fathoms. 



Material examined. — See table 54, page 173. 



