. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL DEVELOPMENT OF PETROL1STHES 495 Pereiopods: (Figs. 2, C; 6, A, B, E). Chelipeds not overly large, flattened, somewhat subequal, covered with many setae. Moveable finger of each with two distinct spines laterally as illustrated (Figure 6, E). Carpus of chelipeds appear- ing unarmed but under high magnification about three very small spines appear on interior edge; postero-distal edge with one or two small spinules. Dorsal margin of propodus next to articulation of dactylus may have two hooked spinules. Merus, carpus an
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL DEVELOPMENT OF PETROL1STHES 495 Pereiopods: (Figs. 2, C; 6, A, B, E). Chelipeds not overly large, flattened, somewhat subequal, covered with many setae. Moveable finger of each with two distinct spines laterally as illustrated (Figure 6, E). Carpus of chelipeds appear- ing unarmed but under high magnification about three very small spines appear on interior edge; postero-distal edge with one or two small spinules. Dorsal margin of propodus next to articulation of dactylus may have two hooked spinules. Merus, carpus and propodus of walking legs as illustrated; merus with lateral setae project- ing from rugae as illustrated (Figure 6, A), plus about six very small spinules on dorsal margin; one large distinct spine dorso-distally; carpus with setae as shown plus distinct long spine laterally; propodus with two strong spines placed more or less laterally plus five spines ventrally, in addition to long and short setae illus- trated; dactylus with setae and spinules as shown. Pereiopod 5 (Figure 6, B) as illustrated, each with five to six long serrate scythe-like setae. Pleopods: (Fig. 6, C, D). Occur on segments two-five; biramous, becoming. FIGURE 6. Megalopal locomotory appendages and tail fan of Petrolisthes tridcntatus Stimp- son A, Pereiopod 2; B, Pereiopod 5; C, Pleopod 1; D, Pleopod 4; E, Detail of chela ; F, Tail fan (ventral view). Scale lines equal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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