394 NORTH AMERICAN INDEX FOSSILS. 



Superfamily Oxystomata Milne Edwards. 

 XXL Pal^eocorystes Bell. 

 Carapace longer than broad, slightly arched, narrowing pos- 

 teriorly, latero-anterior border dentated ; rostrum-short ; orbits mod- 

 erately broad, oval, with two fissures ; neck furrow strong ; abdomen 

 of seven segments, the first five short, the sixth quadrangular, the 

 seventh semiovate; chelae of first pereiopods equal, posterior feet 

 much smaller. Cretacic-Recent. 



41. P. harveyi Woodward. Cretacic. 

 Carapace very finely and minutely granulated, with a faint 



median longitudinal ridge, and two pairs of curved lateral furrows. 

 Nanaimo group of Vancouver Islands, B. C. 



Superfamily Oxyrhyncha Latreille. 

 XXII. LoxoRHYNCHus Stimpson. 

 Large; carapace pyriform and subglobose, narrowing forward, 

 broadly rounded behind ; surface more or less spinose ; rostrum 

 bifid, horns generally strongly deflected downwards, and outwards ; 

 orbits slightly excavated, with a single supraorbital fissure; ex- 

 ternal antennae not concealed, with a broad basal portion. Mio- 

 cenic-Recent. 



42. L. grande Simpson. Miocenic-Recent. 

 Surface of carapace covered with small warts of nearly uniform 



size, blunt and rounded near the middle, but sharp and spine-like 

 anteriorly and on the sides, where they are also more crowded; 

 hepatic region with seven spines, two of them large ; rostrum longer 

 than wide, slit for a little more than half its length, and deflected 

 downwards to almost at right angles to the horizontal axis; first 

 pair of feet shorter than second, inner margins of chelae in contact 

 throughout, and denticulate. Length of carapace of type 5.55 

 inches, greatest width 4.54 inches. 



Upper Miocenic (Etchegoin formation) of Fresno County, Cali- 

 fornia. Living off coast of California. 



Superfamily Cyclometopa Milne-Edwards. 

 XXIII. Cancer Leach. 

 Cephalothorax very broad, moderately convex, arcuate in front, 

 and narrowed behind, without prominent rostrum. Antero-lateral 



