THE SPIDER CRABS OF AMERICA 43 



PODOCHELA MARGARITARIA Rathbun 



Plate 15; plate 209, fig. 1 



Podochela margaritaria Rathbun, Proc. Washington Acad. Sci., vol. 4, 1902, 

 p. 283, pi. 12, fig. 12 (type-locality, Tagus Cove, Albemarle Island, 12 

 fathoms; holotype. Cat. No. 24834, U. S. N. M.). 



Diagnosis. — Rostrum hood-shaped, carinate. No postorbital lobe. 

 Sternum coarsely granulate. Fingei-s of adult male narrowly gaping. 



Description. — Ventral surface covered with coarse, pearly granules; 

 dorsal surface inconspicuously granulate, especially on the depressed 

 portions and the branchial regions. A high conical tubercle on the 

 cardiac and on the gastric region, Kostrum long, hood-shaped, the 

 hood thin, sharply cristate on median line. No postorbital lobe. 

 Hepatic region small, swollen, converging to a small, downward- 

 pointing tubercle. A similar pterygostomian tubercle. Sternal seg- 

 ments high, closely covered with white granules, and separated by 

 deep smooth depressions; two tubercles in front of the abdomen ter- 

 minate ridges leading upward between which is a deep trough. 



Basal antennal article narrowed anteriorly, deeply concave^, 

 lateral margins prominent. Chelipeds moderately roughened, chiefly 

 on the margins, a few tubercles on the carpus, manus swollen, fingers 

 narrowly gaping except near the tips. Legs of moderate length, 

 first pair two and a half times length of carapace, dactylus short, 

 slender, curved, propodus five times as long as dactylus. Remain- 

 ing legs respectively tw^ice, one and two-thirds and one and a half 

 times the carapace length; dactyli of similar length and curvature, 

 the second a little slenderer. Propodites distally thickened and 

 bent upward, the amount of thickening increasing from second to 

 fourth leg. The second propodus is two and a half times its dactylus, 

 the third twice, and the fourth a little less than twice its dactylus. 



Measurements. — Male, holotype, length of carapace 15, wndth 11 

 mm. 



Range. — Known only from Tagus Cove, Albemarle Island, 

 Galapagos Islands. 



Material examined. — 



Tagus Cove; 12 fathoms; Stanford Univ. Exped.; one male holo- 

 type (24834). 



Tagus Cove, on reef north of Tagus Hill; 2 males, 1 female (Stan- 

 ford University) . 



