FISHERY BULLETIN: VOL. 73, NO. 3 



against the subjacent dorsal plates which come 

 together, meeting mesially, and adhere to ster- 

 nites XIII and XIV. The narrow posterior portions 

 of the blades meet on the midline, forcing the 

 geminate body ventrally and causing the caudal 

 lobes to project posteroventrally, resembling 

 paired rudders. 



Material 



MEXICO. 15, USNM, between Monte Alto and 

 San Jose, Chiapas, 25 m, 8 August 1970, D. 

 Palacios. 



PANAMA. 6 c? 25, syntypes, ANSP No. 73, 

 "Isthmus of Panama," J. A. McNeil.- 6c? 12$ , YPM, 

 off Bella Vista, 9 February 1934, Bingham 

 Oceanogr. Exped.- 7c?, USNM, off Juan Dfaz, 4.5-7 

 m, 26 February 1973, Patricia.-2 $ [impregnated], 

 USNM, off Panama Prov., 6 March 1973, Patricia.- 

 1(? 1$, USNM, E of Panamd City, 7 m, 5 November 

 1971, D. E. Sweat. 



COLOMBIA. 12c? 12$ [1$ impregnated], USNM, 

 off Punta Soldado, Buenaventura, 4.5 m, 1 March 

 1973, Santanderino.- 6 c? 13?, USNM, Tortugas 

 Grounds, Buenaventura, 9 m, 19 September 1969, 

 Caciqite stn. 69-24. 



ECUADOR. 6 c? 3$, USNM, off Playas, 1963, 

 commercial catches. 



PERU. 19 , USNM, Caleta Cruz, Tumbes, 18 m, 

 January 1969, E. M. del Solar. 



Species Range 



Chiapas, Mexico, to Tumbes, Peru, and Islas 

 Galapagos. 



Penaeus {Litopenaeus) stylirostris 



Stimpson 1871 



Figures 8-12 



Spermatophore 



The compound spermatophore consists of a 

 slender, geminate body produced into large 

 anterolateral wings, broad posterolateral flanges, 

 and bearing paired elongate blades (Figure 8). 



The ventral wall of each spermatophore is trun- 

 cate anteriorly; posteriorly it continues indis- 

 tinctly with the thick posterior portion of the 

 lateral wall, both walls then turning abruptly 

 dorsad forming the fundus of the sac just before 

 joining the flange (Figure 9A). The lateral wall, 

 mostly thin, is bounded by a very fine dorsolateral 



rib. This rib serves as the base of a long, moder- 

 ately broad blade, which extends from the base of 

 the wing (there fused to its posterior ridge) to the 

 anterior extremity of the flange, and continues 

 along the entire border of the latter. The blade is 

 somewhat arched over its attachment to the rib, 

 which delimits two longitudinal parts. One part is 

 directed dorsomesially to the base of the flange, 

 where it twists laterally, the other part projects 

 ventromesially throughout its entire length, and 

 bears anteriorly an iridescent, rather membranous 

 broad flap to which adheres (dorsally) a mass of 

 viscous material; along the flange the ven- 

 tromesially projecting part becomes flexible and 

 sustains a narrow extension of the flap, supporting 

 a mass of glutinous material on its mesial surface. 

 The flange is somewhat broadly ovate, and is 

 covered by a large dorsal plate which occupies its 

 entire surface and extends beyond the flange 



Figure %.—Penae}i8 (Litopenaeus) stylirostris Stimpson. Com- 

 pound spermatophore attached to female (geminate body 

 slightly displaced posteriorly to show bases of wings),$38 mm cl, 

 off Panamd Province, Panama. 



472 



