. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 199 Description.— Carapace covered with spines or with spines and tubercles. Surface clothed with a vesicular pubescence mixed with longer, curved, yellow bristles which are most numerous about the spines and form a longitudinal row extending from either side of the gastric region to the extremity of the rostrum. A stout spine on the margin of the hepatic region and another equally large just below the margin. A tubercle on the edge of the supraocular eave just above the eye. The basal antennal article besides the
. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 199 Description.— Carapace covered with spines or with spines and tubercles. Surface clothed with a vesicular pubescence mixed with longer, curved, yellow bristles which are most numerous about the spines and form a longitudinal row extending from either side of the gastric region to the extremity of the rostrum. A stout spine on the margin of the hepatic region and another equally large just below the margin. A tubercle on the edge of the supraocular eave just above the eye. The basal antennal article besides the antero- external spine has a tubercle on the outer margin and another on the anterior margin at the insertion of the next article. Chelipeds of adult male much enlarged and about one and one- fourth times the length of the carapace. Outer surface of merus and carpus and upper surface of proximal half of manus tuberculate; merus sub triangular, three or four spines on upper margin. Hand much swollen, about two-thirds as thick as high and about two-thirds as high as its superior length. Fingers gaping for less than half their length. Legs subcylindrical; merus with a few spines or tubercles on distal half of upper margin, most evident in the first pair; carpus elongate, with a few tubercles or spines, and a longitudinal de- pression on the outer surface; propodus smooth. The vesicular pubescence on the legs is for the most part longer than on the carapace and ex- tends to the horny tips of the dactyls; a few curved, yellow bristles are intermixed. Measurements.—Male (18640), length of cara- pace to tip of horn 200 mm., width 159 mm., length of propodus of cheliped on lower margin 120, on upper margin 66, width of same 46, thickness , length of movable finger 64 mm. Range.—From Sari Francisco, California, to Point San Bartholome, Lower California; to a depth of 68 fathoms; not common. Fossil in Fresno County, California, in Lower Pliocene series. Material examined.— C
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
