Appendix to Part II. 625 



The surface of the shell appears to have been concentrically, 

 though irregularly, striated. 



The specimen consists of the cardinal and apical portions of 

 two united valves. 



Copiapo, Chile. 



Astarte Dakwikei. — PI. V. figs. 22, 23. 



Shell broadly ovate, much compressed, marked with rather distant 

 regular concentric ridges ; the interstices broad and concentri- 

 cally striate ; anal and oral extremities nearly equally broad ; 

 breaks very obtus. 



Breadth, 1 ^ ^length, ^\ ; thickness, ^ of an inch. 



Copiapo, Chile. 



Gkypil^a Darwieii. — PI. V. fig. 7. 



Lower valves very tumid, elongated, arcuated, laterally compressed, 

 and much incurved at the rostral extremity ; its surface undu- 

 lated by distant distinct sinuous furrows, marked with lesser 

 sulcations or striations. Upper valve concave, spatulate, and 

 concentrically furrowed. 



Length, 3| ; breadth, 2 ; distance from summit of beak to 

 lowermost and central part of lower valve, 2~ inches. 



Copiapo, Chile. 



GRYPH2EA Nov. Sp. ?— PI. V. figs. 8, 9. 



Lower valve not very convex, rugged, angulated ; upper valve concave, 

 orbicidar, furrowed zoith deep concentric sidcations. Apparently 

 a young specimen. 



Length, 1| ; breadth, 2~ ; thickness, ~ of an inch. 



Copiapo, Chile. 



Lucira Americana. — PI. V. fig. 24. 



Shell orbicular, much depressed, the surface rough, with sharp, re- 

 gular, elevated, distant, concentric ridges {about twenty-Jive on 

 specimen examined^ ; the interstices are striated concentrically. 

 Length, \~ ; breadth, the same ; thickness, ■— of an inch. 



In shape this species resembles the recent Lucina radula. 

 Iquique, Southern Peru. 



