FISHERY BULLETIN: VOL. 77. NO. 4 



distally rather flexible and translucent marginal 

 region, reflexed inwardly; distal part of ventral 

 costa curving abruptly dorsomesially and ending 

 in short, relatively narrow process reaching ap- 

 proximately to level of cincinnuli. 



Appendix masculina (Figure 18C) considerably 

 broader than long (width about 1.7 length), 

 roughly oval; band of setae extending around free 

 margin, broadening and forming patch mesially. 



Thelycum (Figure 19) with plate of sternite 

 XIV roughly subelliptical in outline, its anterior 

 border strongly arcuate and inclined posterolat- 

 erally, and anterolateral and posterolateral cor- 

 ners arched, plate sloping toward submedian de- 

 pressions of VEiriable length, and bearing long 

 marginal setae; median ridge broadest and most 

 prominent posteriorly, tapering anteriorly, some- 

 times reduced to posterior tubercle. Posterior 

 thoracic ridge narrow and projecting anteroven- 

 trally at base of median ridge, fringed anteriorly 

 with closely set setae. Median plate of sternite 

 XIII subsemicircular to roughly trilobed, some- 

 times with minute anteromedian spine, and cov- 

 ered with setae except for central depression; 

 posteromedian projection broad, with posterior 

 margin entire or very shallowly emarginate. 

 Sternite XII bearing posteromedian, subconical 

 tooth with apex directed anteroventrally; oblique 

 pairs of sharp ridges extending posterolaterally 

 from base of tooth. 



Figure 19. — Penaeopsis Jerryi , holotype. Thelycum ventral 

 view. Scale = 1 mm. 



Spermatophore bearing mesial element which 

 in impregnated females lies exposed on the 

 thelycum. 



Color. — Red (Wood-Mason 1891), or dark brown 

 with reddish tint (Kurian 1964). 



Figure 18. — Penaeopsis jerryi , d 19mmcl,ofBerbera,Gulfof Aden, Somalia. A, Petasma.dorsal view. B, Ventral view. C, Paratype 

 6 21 mm cl, off Cochin, India, right appendix masculina, dorsal view. Scales = 1 mm. 



740 



