N0.1237. SYNOPSIS OF THE LUCINACEA— BALL. 805 



MYRTi^A (EULOPIA) SAGRINATA Dall, 1886. 



Florida Keys and westward to Yucatan Strait, in 85 to 3(J() fathoms. 



A peculiar small shell with which Luc ma fabula Reeve is naturally 

 associated. It was described as Lucina sagrinata.^ 



]v[oTE. — The type of this genus is the Venus spinifei^a Montagu, 

 ]^^03. _[_ MyrtiWi spinif era Turton, 1822; Lucina hiatelloides (Basterot) 

 Philippi, 1836; and Ludna spinom Philippi, 1844. 



No species of this genus are yet reported from the Pacific coast. 



Genus PHACOIDES Blainville. 



This is PJuicoideH Blainville, 1825; Lucina Lamarck, 1801 (but not 

 Lamarck, 1799); Trlodonta (sp.) Gray, 1851 (not of Schumacher, 1817); 

 LLere Gabb, 18H6: LInga de Gregorio, 1885; Oavilucma and Drntilu- 

 cina Fischer, 1887. 



This comprises most of the species included by many authors in 

 Lucina, in a broad sense, but not the original Lucina of Lamarck, 

 which has very generally been called Loripes erroneously. 



Owing to the very numerous modifications of characters shown in 

 this group, it becomes necessary, for clearness, to divide it into a rather 

 large number of subdivisions, both su])genera and sections. 



Subgenus Phacoides Blainville, s. s. Type Tellimi pectinata Gmelin 

 (+ Lucina janHiicensis Lamarck). 



Shell lentif orm, with strong dorsal areas and chiefly concentric sculp- 

 ture, the cardinal teeth o])solete in the adult, but the laterals well 

 developed. 



This is Denfilucina Fischer. 



Subgenus Here Gal)li. Type, Lucina richthofeni Gabb. 



Shell solid, globose, with developed dorsal areas and conspicuous 

 concentric sculpture, the lunule often deeply impressed and the right 

 anterior cardinal effaced, the other teeth well developed. 



This is Lucina Schumacher, 1817, not Lamarck, 1799, + Linga de 

 Gregorio, 1885. It may l)e divided into sections, the typical group, 

 as above, and: 



Section Pleurolucina Dall, 1901. Type, Lucina leucocyma Dall. 



1886. 

 Shell with a small numlxn- of large radial ribs in addition to the con- 

 centric sculpture. 



Section Camlucina Fischer, 1887. Type, Lucina sulcata Lamarck. 

 Shell small, compressed, concentrically striate, the areas and teeth 

 often obsolete, the luiuile small and often deep. 



Subgenus Lucinisca Dall, 1901. Type, Lucina nassula Conrad. 

 Shell lentif orm, white, with well-marked dorsal areas, the sculpture 

 reticulate and muricate, the right anterior cardinal obsolete. 



nt is figured in the Proc. U. S. Nat. Mus., XII, 1889, p. 263, pi. xiv, fig. 11. 



