166 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 20 



PLATE 6 



Fig. 26. Modiolus foniicatus (Carpenter) 1864. Monterey (Chace 

 collection) Length: 34 mm. 



Fig. 27. Modiolus americanus (Leach) 181S. Isia La Plata, Ecua- 

 dor. Length: 15.4 mm. 



Fig. 28. Modiolus americanus (Leach) 1815. Bahia de Santa 

 Maria, Baja California. Length: 29 mm. 



Fig. 29. Modiolus eiscni Strong and Hertlein 1937. Boca de Cule- 

 bra, Costa Rica. Length: 11.8 mm. 



Fig. 30. Modiolus capax (Conrad) 1837. Newport Channel, Cali- 

 fornia. Length: 36 mm. 



