174 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 20 



PLATE 10 



Litlwphaga (Myofoneps) aristala (Dilluyn) 1817. Cen- 

 tral America. Strongly projecting incrustation. Length: 

 23.8 mm. 



Liihophaffa {Myoforceps) aristala (Dillwyn) 1817. Isia 

 Gorgona, Colombia. Incrustation without typically project- 

 ing part. Length: 24 mm. 



Lithopha(ja (Dihcrus) plumula (Hanley) 1843. Playa 

 Blanca, Costa Rica. Length: 41.2 mm. 



Lithoplia(ja (Diherus) subula (Reeve) 1857. Smugglers 

 Cove, Santa Cruz Island, California. Length: 44 mm. 

 Lithophat/a (Labis) attenuata (Deshayes) 1836. Puerto de 

 San Bartolome, Baja California. Length: 80 mm. 

 Litliophaoa {Labis) peruviana (Orbigny) 1846. Bahia 

 de la Independencia, Peru. Length: 59 mm. 

 Lithophac/a (Leiosolenus) spatiosa (Carpenter) 1856. Off 

 Cabo de San Francisco, Ecuador. The vertical rows of 

 pustules indicate rucjifera Carpenter 1856. Length: 18 mm. 

 Lithopha(/a (Leiosolenus) hancocki n.sp. Holotype. Isla 

 Onslow, north of Isla Floreana (Charles Island), Gala- 

 pagos Islands. Length: 32 mm. 



Lithophaga (Stumpiella) calyculaia (Carpenter) 1856. 

 Bahia Sulphur, Isla Clarion, Mexico. Lateral view. 

 Length: 16 mm. 



Lithophaga (Stumpiella) calyculata (Carpenter) 1856. 

 Dorsal view, showing the dorsal opening in the incrusta- 

 tion. Length: 16 mm. 



Liihophaga (Stumpiella) calyculata (Carpenter) 1856. 

 Ventral view, showing the ventral opening in the incrusta- 

 tion. Length: 16 mm. 



