522 axel a. olsson 



Explanation of Plate 49 



Figure Page 



1-la. Chionopsis gnidia (Broderip and Sowerby) 300 



Fig. 1, length 120 mm.; Fig. la, length 94.6 mm. San Ignacio Lagoon, 

 Lower California. H. Hemphill. ANSF 60279. 



2. Chioiie (Lirophora) cf. mariae (d'Orbigny) 296 



Length 17.3 mm. Zorritos, Peru. PRI 25747. 



3. Protothaca costellata (Sowerby) 



Length 41.4 mm. Island of San Lorenzo, Callao, Peru. Leg. W. 

 Weyrauch. USNM. 



4-4a. Lamelliconcha unicolor (Sowerby) 289 



Length 52.5 mm. Bucaro, Panama. PRI 25748. 



5-5a. Agriopoma (Pitarella) catharia (Dall) 279 



Length 52.8 mm. Panama Bay, shrimpers. Coll. H-. Johnson. PRI 



25749. 



6. Lamelliconcha callicomata (Dall) 289 



Length 47.8 mm. Panama Bay. Coll. H. Johnson. PRI 25750. 



7-7a. Pitar (Hyphantosoma) pollicaris (Carpenter) 277 



Length 65.5 mm. Cape St. Lucas, Lower California. Holotype, USNM 

 12721. 



8-8a. Chione (Lirophora) mariae (d'Orbigny) 296 



Length 20.2 mm. Pleistocene, Rabo de Puerco, Puerto Armuelles, 

 Panama. P'RI 25751. 



9. Pitar (Hyphantosoma) aletes Hertlein and Strong) 277 



Copied after Hertlein and Strong, 1948. Length 53.8 mm. Arena Bank, 

 Gulf of California. 



10. Nioche squamosa (Carpenter) 309 



Length 6.1 mm. Santa Elena, Ecuador. PRI 25752. 



