FISHERY BULLETIN; VOL. 87, NO. 4. 1989 



viduals). Anterior branchial region bearing less 

 prominent ciliated rugosities, its lateral margin 

 with strong anterior spine followed by 4 spines 

 successively smaller in size. Posterior branchial 

 region with moderately developed spine at 

 anterolateral corner and more distinct and trans- 

 versely developed setose rugae, with tendency 

 in larger adults for these to be most elongate 

 across anterior and central part of cardiac 

 region. Shallowly concave posterior margin pre- 

 ceded by prominent raised, ciliated submarginal 

 rim of nearly uniform width. Lateral plate ob- 

 liquely rugose, projecting anteriorly below an- 

 tennal peduncle, its rather rounded tip bearing 

 minute spine. 



Abdomen (Fig. 4a) unspined, but segments 2 

 and 3 boldly ridged transversely; ridging of seg- 

 ment 4 transitional; segments 5 and 6 smooth, 

 latter with posterior margin trilobate, distal 

 margin of lateral lobes convex, that of broader 

 median lobe very shallowly concave. Telson 

 (Fig. 2/) composed of 8 plates, length-width ratio 

 in holotype 0.85, in smaller V paratype 0.83, 

 midlateral plate convex on distolateral margin. 



Eyes (Figs, ia-b) moderate in size; well ex- 

 posed, smoothly ovate cornea cupped within 

 broad-based slightly movable ocular peduncle 

 extended into elongate mesiodorsal spine; spine 

 horizontal or directed obliquely upward at low 

 angle; peduncle ornamented with few setae and 

 tiny irregular obsolescent spinules, much 

 shorter mesioventral spine, and intermediate 

 length lateral spine. 



Basal article of antennular peduncle with 

 crested dorsal margin minutely and in'egularly 

 serrate, extended into slender dorsolateral 

 spine, broader lateral spine below, base of each 

 flanked laterally by cluster of irregular, small, 

 obsolescent spinules on inflated lateral side of 

 article; mesial edge with crenulate scalloped 

 margin. Antennal peduncle with fixed basal arti- 

 cle extended into stout, flat, ventral spine and 

 shorter lateral spine with crenulate margin; suc- 

 ceeding articles short, second bearing slender 

 lateral angle, third with scalloped and crenulate 

 distal margin, fourth with scalloped distal 

 margin, its dorsolateral projection stoutly spine- 

 like. 



Third maxilliped with ischium snorter than 

 merus; bearing mesial crest armed with finely 

 uniform, evenly spaced corneous-tipped spines; 

 anteroventral angle acute. Basis with 2 low 

 spines in line with crest on ischium. Merus (Fig. 

 4c) with few obsolescent spines preceding 3 prin- 

 cipal spines on flexor margin, proximal and 



middle spines incompletely doubled; extensor 

 margin broadly arched, strong, acute spine at 

 anterodistal corner. Carpus, propodus, and 

 dactyl folded on merus-ischium and about as long 

 as those 2 articles together, dense setation on 

 dorsal surface of each, and distally on flexor sur- 

 face of propodus and dactyl. Sternite at base of 

 third maxilliped (Fig. id) with crenulate anterior 

 margin on angular mesial and lateral lobes. 



Epipod present on first pereopods (chelipeds). 



Chelipeds (Fig. ie-g) stout, subequal, orna- 

 mented with moderately developed, variably 

 setose rugosities tending to arrangement in 

 longitudinal tracts; ischium with short lateral 

 spine and mesial ridge bearing obsolescent sub- 

 terminal spines; merus bearing 3 principal mesial 

 spines, 1 distodorsal spine, and distoventral 

 spine on mesial and lateral margins; carpus with 

 dorsolateral row of tubercles and mesiodorsal 

 row of 3 spines; palm nearly smooth, few ob- 

 solescent tubercles on dorsomesial surface; stout 

 fingers shorter than palm, spooned at tips, pre- 

 hensile edges close fitting, crenulate; crest of 

 small spines at distolateral angle of fixed finger. 



Walking legs rather long, first walking leg 

 (Fig. Ah) exceeding tip of chela, second and third 

 reaching to near base of dactyl on preceding leg; 

 corresponding articles of respective legs approx- 

 imately equal in length except for meri which 

 successively decrease posteriorly; each merus 

 with crest on dorsal margin ending in distal 

 spine, and corresponding crest on ventrolateral 

 margin; carpi with longitudinal spiny dorsal and 

 tuberculate dorsolateral crest, each ending in 

 more or less well-developed spine; each pro- 

 podus slender, bearing crests in line with those 

 of carpus, dorsal crest bearing 2 remote spines in 

 proximal half, each with small movable spine 

 distolaterally at base of dactyl, another some- 

 times preceding it in distal Va of length, and 

 smaller movable spine at distomesial corner; 

 each dactyl slender, acute corneous tip preceded 

 by row of 10-12 movable spines on flexor 

 margin. Slender, chelate fifth leg with well- 

 developed cleaning brush on palm and somewhat 

 pointed but flattened dactyl opposed by similar 

 setae on distal end of propodus. 



Variation. — There is minor variation in orna- 

 mentation of the specimens available for study, 

 large adults being relatively more coarsely orna- 

 mented than smaller individuals. 



Remarks. — Munidopsis lignaria is allied to M. 

 ciliata Wood-Mason of the western Indo-Pacific, 



906 



