520 axel a. olsson 



Explanation of Plate 47 



Figure Page 



1-lc. Hysteroconcha lupanaria (Lesson) 283 



Figs. 1, la, figures copied after Romer. ; Fig. lb, length 42.3 mm. 

 Santa Elena, Ecuador. PRI 25729; Fig. Ic. length 39 mm. Boca Fan, 

 Peru, PRI 25730. 



2-2d. Hysteroconcha multispinosa (Sowerby) 284 



Figs. 2, 2a, 2b, figures copied after Romer; Fig. 2c, length 33.8 mm.; 

 Fig. 2d, length 41.3 mm. Guanico, Panama. PHI 25731. 



3-3d. Hysteroconcha rosea (Broderip and Sowerby) 284 



Fig. 3, dorsal aspect, figure after Romer; Fig. 3a, length 47.8 mm. 

 Manglaralto, Ecuador. PRI 25732; Figs. 3b, 3c, length 47 mm., San 

 Francisco, Ecuador. PHI 25733; Fig. 3d; length 45 mm., Buenaven- 

 tura, Colombia. PRI 25734. 



4-4a. Hysteroconcha breyispinosa (Sowerby) 284 



Length 44.7 mm. Limones, Ecuador. PRI 25735. 



