. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 513 Subgenus Parthenope Lamhrus A. Milne Edwards (restricted), Crust. R6g. Mex., 1878, p. 146; tj^pe, L. longimanus.—Miers, Challenger Rept., Zool., vol. 17, 1886, p. 92 (part).—Alcock, Journ. Asiat. Soc. Bengal, vol. 64, 1895, p. 260. Parthenope Rathbun, K. Danske Vidensk. Selsk. Skrifter, 7 Raekke, naturv. og math., Afd. 5, No. 4, 1910, p. 319. Carapace ovate-pentagonal or subcircular, with the surface granu- lar or pustular and but little carinate in the adult; rostrum usually exceedingly short. PARTHENOPE (PAR
. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 513 Subgenus Parthenope Lamhrus A. Milne Edwards (restricted), Crust. R6g. Mex., 1878, p. 146; tj^pe, L. longimanus.—Miers, Challenger Rept., Zool., vol. 17, 1886, p. 92 (part).—Alcock, Journ. Asiat. Soc. Bengal, vol. 64, 1895, p. 260. Parthenope Rathbun, K. Danske Vidensk. Selsk. Skrifter, 7 Raekke, naturv. og math., Afd. 5, No. 4, 1910, p. 319. Carapace ovate-pentagonal or subcircular, with the surface granu- lar or pustular and but little carinate in the adult; rostrum usually exceedingly short. PARTHENOPE (PARTHENOPE) AG ON US (Stimpson) Plates 178 and 179; plate 275, figs. 1-3 Lamhrus agonus Stimpsox, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 131 (type-localities, off the Marquesas, off Carysfort Reef, oflf Conch Reef, 40 and 49 fathoms; types not extant).—A. Milne Edwards, Crust. Reg. Mex., 1878, p. 151; 1879, pi. 28, figs. 3-3c. Diagnosis.—Carapace subcircular, A ventral spine on each side opposite cheliped. Chelipeds very long; four or nearly four times as long as carapace. Second segment of abdomen conspicuously three-lobed. Description.—Carapace ovate-pentagonal or subcircular, about one-fifth broader than long, with rounded sides, without angles; a moderate postorbital constriction, which, however, does not involve a prominent, dentate, pterygostomian ridge which con- tinues from the lower orbit to a point above the cheliped. Depressions between regions not remarkably deep. Surface coarsely punctate or eroded, and with numerous granules and tubercles; the larger tubercles more or less spiniform and arranged as follows: Five on gastric region, of which four are near the middle in a transverse line, and the other, larger, on median line, further back; three in a longitudinal row on cardiac region; one on each side of urocardiac lobe; five on each branchial region, the posterior one being prolonged in a spine; one on each hepatic region. The antero-lateral margin of bra
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