FISHERY BULLETIN: VOL. 76, NO. 4 



marginal setae plus finer setules on either side of 

 upper lateral surface. 



Maxilliped 1: (Figure 9F). Exopodite and en- 

 dopodite weakly chitinized; former two- 

 segmented, with 3 more or less terminal setae; 

 latter naked. Protopodite with about 27 and 15 

 setae on basal and coxal endites, respectively, 

 placed as illustrated. 



Maxilliped 2: (Figure 9G). Exopodite two- 

 segmented, 8 terminal, plus other setae, as shown. 

 Endopodite four-segmented, proximal two with 4 

 and 2 setae, respectively, distal two each with 

 about 12 processes, including 5 daggerlike spines 

 terminally. Setae on basipodite and coxopodite as 

 illustrated. 



Maxilliped 3: (Figure 9H). Exopodite two- 

 segmented, 8 terminal setae. Endopodite five- 

 segmented; ischium and merus each with strong, 

 sharp triangular spine, plus a shorter spine at 

 anterodistal angle; ischium also with prominent 

 crista dentata; last three segments (carpus, prop- 

 odus, dactylus) with 3, about 15, about 18 long 

 daggerlike spines plus numerous longer setae in- 

 terspersed among them. Several setae on coxopo- 

 dite and basipodite. 



Pereiopods: (Figures 8 A, B; 91, J). Chelipeds 

 rounded, equal, elongate, heavily spined, covered 

 with long, stiff bristlelike setae, these more prom- 

 inent in gape of fingers and on outer surface of 

 manus; fingers of each hand trifid at tips. Merus 

 and carpus with marginal spines. Walking legs 

 thin, elongate; merus, carpus, and propodus cov- 

 ered with setae plus small spinules ventrally 

 along margins, these often difficult to discern ex- 

 cept under higher (40x objective) magnification; 

 propodus with 2 larger spinules ventrally; dac- 

 tylus with 3 large movable spinules plus one fixed 

 triangular tooth on ventral margin; a second, very 

 small, almost vestigial tooth may appear about 

 midway between larger fixed tooth and dactylar 

 tip. Pereiopod 5 chelate, 1 long serrated seta, 3 

 scythelike pectinate setae quite noticeable, plus 

 additional numerous setules on manus; 2 vei'y 

 small, spinulelike teeth on distal tip of dactylus. 



Pleopods: (Figures 8B, 9K). Occur on somites 

 2-5; biramous, greatly elongate; exopodal setae 

 progressing toward telson 8, 8, 8, 7, with minor 

 variation of 1 or 2 occasionally seen on left or right 



802 



side in same specimen; endopodites not as long as 

 exopodites, thin, naked, but each with appendix 

 interna of 2 or 3 small hooks developed at tip. 



Tail Fan: (Figure 9L). Telson with 6 or 7 long 

 plumose setae, and several shorter marginal setae 

 interspersed among these, numbers of latter in- 

 consistent in same specimen; 1 or 2 small toothlike 

 spines laterally, as shown. Uropods biramous, 

 each with 4 widely separated marginal spines, 

 that on outer lateral margin of endopodite the 

 strongest; exopodite with about 18-20, endopodite 

 blade with 11-14 plumose marginal setae, num- 

 bers again variable in same specimen. Smaller 

 setae on dorsal and ventral surfaces of tail fan as 

 illustrated. 



Color: Megalopa beautifully colored. Carapace 

 and abdomen overall red-orange, dorsolateral 

 carapace margins and spines darker red; an ir- 

 regular longitudinal white, or semitranslucent 

 stripe extends dorsally from just behind frontal 

 region along entire length of carapace and ab- 

 domen; this stripe bordered with darker orange- 

 red chromatophores along its length; a similar 

 white stripe appears laterally, below which 

 carapace becomes translucent, but covered with 

 numerous red spiderlike chromatophores; a third 

 stripe appears ventrally on sternum, extending to 

 junction of abdomen. Numerous pale blueish- 

 white dots interspersed over dorsal surface of 

 carapace, especially on either side of previously 

 noted longitudinal stripe. Eyestalks orange-red, 

 with regular white band longitudinally, this meet- 

 ing second band which encircles distal margin of 

 eyestalk just before cornea; latter black, overlain 

 with dark red maculations. Chelipeds with distal 

 margin of mei'us, entire carpus, propodus, and all 

 but distal tip of dactylus ivory white; merus prox- 

 imally red-orange; cheliped finger tips orange. 

 Walking legs translucent, speckled with many 

 red-orange chromatophores, these coalescing to 

 form irregular bands on outer segments; dactyli of 

 latter clear, or light horn color. 



DISCUSSION 



In the western North Atlantic Ocean the family 

 Galatheidae is represented by four genera: 

 Galathea (2 species), Munida (31 species), 

 Munidopsis (48 species), and Phylladiorhynchus 

 (1 species). With the exception of the present re- 

 port, the larval development of the remaining 81 



