NO. 1704. A COLLECTION OF SHELLS FROM PERU— BALL. 237 



Genus HELCIONISCUS Dall. 

 HELCIONISCUS NIGRISQUAMATUS Reeve. 



1854. Patella nigrisqtiainata Reeve, Con. Icon., Patella^ fig. 3. 

 Concepcion, Chile. 



Family ACM^ID^. 

 Genus SCURRIA Gray. 



SCURRIA MESOLEUCA Menke. 



1851. Acmaea mesoleuca Menke, Zeitschr. f. Mai., p. 38. — 

 Patella striata Reeve, Con, Icon., Patella^ fig. 99; not P. 

 striata Quoy. Gulf of California, and south to Guayaquil 

 and the Galapagos Islands. 



SCURRIA PARASITICA Orbigny. 



1841. Patella parasitica Orbigny, Voy. Am. Mei-., p. 481, pi. 81, 

 figs. 1-3; not of Reeve. Mollendo, Peru, and south to Val- 

 paraiso, Chile. 



SCURRIA SCURRA Lesson. 



1830. Patella scurra Lesson, Voy. Coq., p. 421. — Orbigny, Voy. 

 Am. Mer., p. 478, pi. 64, fig. 11, 1841. From Callao, Peru, 

 south to S. lat. 41°, living on the stalks of Macrocystls. 



SCURRIA ZEBRINA Lesson. 



1830. Patella zehrma, Lesson, Voy. Coq. , p. 417. — Acmsea sehrina 

 Orbigny, Voy. Am. Mer. , p. 480, pi. 65, figs. 1-3, 1841. Mol- 

 lendo, Peru, and south to the Magellanic region. 



Genus ACM^^A Eschscholtz. 

 ACMiEA ALBESCENS Phillippi. 



1846. Zeitschr. f. Mai., p. 50. Abb., vol. 3, p. 118, pi. 2, fig. 7. 

 1849. Central Chile. 



ACM.iEA ARAUCANA Orbigny. 



1841. Voy. Am. Mer., p. 482, pi. 65, figs. 4-6; not of Reeve. 

 Paita, Peru, and south to Valparaiso, Chile. 



hCmjEK CECILIANA Orbigny. 



1841. Patella ceciliana Orbigny, Voy. Am. Mer., p. 482, pi. 81, 

 figs. 4-6. Antofagasta to Valparaiso, Chile. 



ACM.^A COFFEA Reeve. 



1855. Patella coffea Reeve, Con. Icon., Patella^ fig. 139. Val- 

 paraiso. 



ACM.SA ORBIGNYI Dall, new name. 



1909. Aomx.a scutum Orbigny, Voy. Am. Mer., p. 479, pi. 64, 

 figs. 8, 9, 1841. Not of Eschscholtz, Zool. Atlas, part 5, 

 p. 19, pi. 23, figs. 1-3, 1833. Salaverri, Peru, and the Gala- 

 pagos Islands, and south to the Magellanic region. 



KCmMX VARIABILIS Sowerby. 



1839. Zool. Beechey's Voy., p. 147, pi. 39, fig. 5 (only). Whole 

 Peruvian Province, and the Galapagos Islands. 



