. Allan Hancock Pacific expeditions. Scientific expeditions. 142 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 gin in addition to terminal claw; telson five-plated; no pleopods in male. Description: Carapace markedly broader than long ( or times in males, to in females), very strongly convex front to back; posterolateral regions plicate, carapace otherwise smooth, shining, de- void of hairs. Front transverse in dorsal view, in frontal view faintly trilobate or transverse with a slight median projection. Outer orbital angle forming a small, sharp tooth. Separated portion of side wall
. Allan Hancock Pacific expeditions. Scientific expeditions. 142 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 gin in addition to terminal claw; telson five-plated; no pleopods in male. Description: Carapace markedly broader than long ( or times in males, to in females), very strongly convex front to back; posterolateral regions plicate, carapace otherwise smooth, shining, de- void of hairs. Front transverse in dorsal view, in frontal view faintly trilobate or transverse with a slight median projection. Outer orbital angle forming a small, sharp tooth. Separated portion of side wall con- sisting of one small irregular-shaped Text-fig. 4. Dactyl of walking leg of Pachycheles crassus, x 84. First movable segment of antenna with a low tubercle at anterior margin; second and third smooth; flagellum naked. Chelipeds appearing devoid of hair, but under magnification show- ing a low pile between granules. Merus rugose, with a low rugose crest on anterior margin. Carpus armed on anterior margin with four or five smooth-margined teeth, the proximal one broad and truncate, sometimes tending to be divided into two, the others narrow, conical, and progressively smaller in size; surface covered with large, rather flattened and scale-like granules. Manus heavy, swollen, covered with large, coarse granules, more rounded than those of carpus, those to- ward outer margin often pointed, giving the margin a serrate-edged appearance. Fingers covered with granules similar to those of manus; pollex short, conical, and flattened, dactylus strongly curved; fingers meeting for entire length in both chelipeds, gape without pubescence. Walking legs almost devoid of hairs, a few scattered setae on pro- podus and dactylus only. Dactylus with two strong fixed spines on posterior margin in addition to the terminal claw; proximad to them a single movable spinule (see text-fig. 4). Telson of abdomen with five plates. No pleopods in male. Material examined: Balboa, Canal Zone, Pan
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Keywords: ., bookcentury1900, bookcollectio, booksubjectscientificexpeditions
