278 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



DISCINISCA ANTILLARUM Orblgny. 



Orbicvia antillarum Orbigny, Moll. Cuba, p. 368, pi. 28, figs. 34-36, 1846.— 



Reeve, Conch. Icon., Orbicula, pi. 1, fig. 2, 1862. 

 Disdnisca antillarum Dall, Bull. Mus. Comp. Zool., vol. 3, p. 42, 1871; Proc. Acad. 



Nat. Sci. Phila. for 1873, p. 201.— Davidson, Mon. Rec. Brach., pt. 3, 



204, pi. 26, fig. 31, 1888. 



Type locality. — Cuba, on coral. Orbigny. 



Cat. No. 



64335 

 185369 

 160694 



Locality. 



Jamaica 



Nicaragua 



Goyanna, Brazil 



Collector. 



C. B. Adams. 

 W. H. Fluck. 

 J. C. Branner 



Number 

 of speci- 

 mens. 



Peduncular area large, heart shaped, the valve outside of it finely 

 radiately threaded. The upper valve is rather sparsely radiately 

 threaded, generally with a smooth apex and irregular concentric 

 sculpture. The apex is usually rather posterior. 



DISCINISCA STEXLA Gould. 



Disdna Stella Gould, Proc. Boston Soc. Nat. Hist., vol. 7, p. 324, 1860; Otia 



Conch., p. 120, 1865. 

 Orbicula Stella Reeve, Conch. Icon. Orbicula, pi. 1, fig. 1, 1862. 

 Disdnisca Stella Dall, Bull. Mus. Comp. Zool., vol. 3, p. 41, 1871; Proc. Acad. 



Nat. Sci. Phila. for 1873, p. 202.— Davidson (ex parte), Mon. Rec. Brach., 



pt. 3, p. 204, pi. 26, figs. 27, 27a, 30, 1888. 



Type locality. — China Seas, Hongkong. Stimpson. 



Cat. No. 



1759 

 175724 

 175611 

 228121 

 228123 

 227260 

 217319 



Locality. 



Hongkong (type) 



Fukura, Awaji, Japan 

 Ilirado, Hizen, Japan 



Nagasaki, Japan 



Gulf of Tokio, Japan.. 

 Yenoshima, Japan — 

 Pai-tai-ho, N. China. 



Davidson has confused this species with the next. D. stella has 

 much the same sculpture as D. antillarum, but coarser and tending 

 to papillosity at the intersections of the radial and the concentric 

 sculpture on the upper valve, which has a subcentral apex. The 

 peduncular area is large, heart shaped, and the surface of the valve 

 outside of it finely sharply closely radially threaded. The setae are 

 short, seldom more than just visible outside the shell in dry specimens. 



