384 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



PLATE 18 



Fig. 1. Orthochela pumila Glassell, male. Bahia de la Magdalena, 

 Baja California. 



Fig, 2, Petrolisthes robsonae Glassell, male (HM K26843). Guaya- 

 quil, Ecuador. 



Fig. 3. Petrolisthes nobilii, n. sp., male paratype. Puerto Utria, 

 Colombia. 



