174 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



Gnathopod 1: coxa with 2 plumes at posterior angle; segment 3 

 short, 6 slender, dactyl with stout apical nail. Gnathopod 2: 

 segment 2 anterior margin sinuous, segment 5 elongate, a few slender 

 comb spines ventrodistally; segment 6 short, tumid. Peraeopod 1: 

 coxa with single large seta at posterior angle; segment 4 slightly 

 expanded, anterior margin bare; segment 6 small, with about 12 

 slender marginal spines. Paraeopod 2: posterior lobe large, acute, 

 lower margin long, gently convex; segment 4 stout, anterior margin 

 bare; segment 6 subovate, with about 20 slender marginal spines. 

 Peraeopod 3: coxal lobes deep, broad, subequal, margins bare; 

 segment 2 very broad proximally, posterior margin smooth; segment 

 4 sharply expanding distally, wider than subquadrate segment 5; 

 segment 6 slender, slightly longer than segment 5. Peraeopod 4: 

 posterior coxal lobe shallow, upper margin gently angled; segment 2 

 broadest proximally, smooth behind; segment 4 sub triangular, broadest 

 distally, 2 rows of facial setae; segment 5 narrowing distally to short, 

 nearly straight dental margin; segment 6 cylindrical, distinctly 

 shorter than 5. Peraeopod 5 coxal plate shallow, posterior lobe short, 

 blunt, segment 2 broad elliptical, posterior margin bare, sharply 

 incised proximally; segment 4; posterior lobe narrowing, hindmargin 

 oblique, with 2 spine groups; segment 5 narrow, posterior margin 

 with 1 spine group; segment 6 narrowly spatulate, about equal to 

 segment 5, terminal spines slender. Anterior coxal gills slender, 

 posterior, short, saclike. Anterior 3 brood plates slender, with 20-30 

 marginal setae, that of peraeon 3 orbicular, vestigial. 



Pleosome side plate 3 rounded behind, anteroventral margin 

 nearly straight; 3 groups of marginal setae and a few isolated lateral 

 facial setae. Pleopods with short strong rami, outer 12-14 segmented, 

 inner about 10-segmented. Uropod 1: peduncle strong, posterior 

 margin with proximal minute serrations and distal row of spines; 

 inter-ramal spines slender; rami long and subequal, outer with 7 

 posterior spines and distal circlet of about 16 spines; inner with 4 

 single marginal spines and 10 terminal spines. Uropod 2 : outer ramus 

 slightly shorter than inner, both setose apically, peduncle with 

 simple setae only. Uropod 3: rami longer than stout peduncle; 

 terminal segment of outer ramus short, apices with long setae. Telson 

 short with shallow apical V-cleft, lobes each with 5-6 slender marginal 

 spines. 



Male, 3.5-4.0 mm.: Smaller but similar to female. Antenna 1: 

 flagellum 4-5 segmented, elongate calceoli on 1-4. Antennae 2 

 lacking calceoli. 



Remarks. — P. deichmannae occurs mainly subtidally in shallow, 

 semiprotected inshore water and estuaries, whereas the larger P. 



