16 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.18 



Distribution: Laguna Beach, California, shore; Cedros Island, 10 

 to 15 fms; Gulf of California at Isla Partida and San Esteban Island, 

 10 to 70 fms; south of White Friars Islands and Tenacatita Bay, Mex- 

 ico, 25 fms; Costa Rica at Salinas Bay, Viradores Islands and Playa 

 Blanca, 1.5 to 3 fms; Panama at Secas Islands and Bahia Honda, 5 to 

 35 fms ; Ecuador at La Libertad and Salango Island, 3 to 4 fms ; Peru at 

 Lorenzo Island and Viejas Island, shore to 12 fms. 



Ampelisca venetiensis Shoemaker 

 Plate 9 



Ampelisca venetiensis Shoemaker (1916), Proc. Biol. Soc. Washington, 

 vol. 29, pp. 158-159. 



Description of female: Head projecting, as long as first 3 body 

 segments, lower front margin parallel to upper margin. Upper pair of 

 eyes above and behind incised portion of front margin, lower pair of 

 eyes at lateral angle of head. 



Antenna 1 reaching about half way along fifth article of peduncle 

 of antenna 2; article 1 tumid, article 2 about one half again as long as 

 article 1, article 3 shorter than article 1. 



Antenna 2 about the length of the body ; article 5 of peduncle about 

 three fourths as long as article 4. 



Mandible: spine row with 16 to 20 spines; article 3 of palp slightly 

 shorter than article 2. 



Maxilla 1 : outer plate armed with 1 1 spines ; article 2 of palp more 

 slender than outer plate, apex armed with 5 spines, 4 cusp teeth and 

 8 or 9 setae. 



Maxilliped : inner plate reaching slightly beyond end of palp article 

 1, apex armed with 2 chisel teeth; outer plate reaching to end of palp 

 article 2, inner edge armed with 11 chisel teeth, rounded apex with 6 

 or 7 setal spines and setae, the outer 3 or 4 plumose. 



Coxa 1 : lower posterior angle with a blunt tooth, coxae 2 and 3 

 without tooth or slit. 



Gnathopod 1 : article 6 about two thirds as long as 5, article 7 one 

 half as long as 6. 



Gnathopod 2: article 6 slightly more than one half as long as 

 article 5, article 7 one half as long as 6. 



Peraeopod 1 : anterior distal angle of article 4 produced ; article 7 

 not longer than articles 5 and 6 combined. 



Peraeopod 2: similar to 1 but with generic differences. 



