FISHERY BULLETIN: VOL. 73. NO. 3 



Figure n.-Penaeus (Litopenaeus) setiferus. A, Ventrolateral view of right spermatophore dissected from terminal ampulla, ^SW of 

 mouth of Sabine River, Tex. B, Dorsomesial view of same specimen. C, Ventral view of wing, left spermatophore, (?off Melbourne 

 Beach, Fla. 



mesial lapel; posterior to the bulge, the dor- 

 somesial wall extends laterally to join the lateral 

 wall (along the base of the blade), and posteriorly 

 merges with the flange. 



The wing, long and irregular in contour, is 

 produced posteriorly in a broad proximal lobe, 

 tapering laterally to a rounded, excavated, short 

 tip (Figure 17C). The ventral surface is very 

 irregular, bearing several projections: a rigid sub- 

 triangular or rounded prominence on an anterior 

 rib; an elongate twisted process, its base con- 

 tinuous with a posterior fold of the proximal lobe 

 situated about midlength, extending mesially into 

 a subovate to semicircular flap; and a subdistal 

 shelf obliquely flanking the twisted process. 



The dorsal plate is tear-shaped in outline, 

 rounded anteriorly, tapering posteriorly, and 

 moderately long, extending from slightly beyond 

 the anterior margin of the flange to its 

 posterolateral corner. 



Thelycum (Figure 18) 



Sternite XIV bears a pair of sharp crescentic 

 anterolateral ridges the posterior portions of 

 which converge mesially but do not meet, and are 

 often separated by a median longitudinal rib; the 

 posterior part of this sternite is provided with a 

 pair of closely set fleshy lobes, usually separated by 

 a fine median rib which may be continuous with 

 the anterior one. Sternite XIII is heavily sclero- 

 tized, forming a strong plate produced posteriorly 

 as a soft emarginate shelf overhanging sternite 

 XIV; the anterior part of this sternite bears a pair 

 of soft, naked, transverse elevations flanking a 

 tonguelike lamella bordered by setae. The lamella 

 forms the roof of a concavity floored by a strong 

 ridge of sternite XII. The ridge (a marginal 

 thickening of heavily sclerotized sternite XII, 

 mostly hidden by setose, rounded and relatively 

 short coxal plates of the third pereopods) is almost 



480 



