NO. 1237. SYNOPSIS OF THE LUCINACEA—DALL. 803 



more central umbones, while the very similar Lucina hialata Pilsbry, 

 of Japan, carries the procesg of centralizing the beaks almost to 

 completion. 



LUCINA PHENAX Dall and Simpson, 1901. 



Mayaguez and San Juan harl)ors, Porto Rico, in 5 to 30 fathoms. 



Small, delicate, sparsely concentrically threaded, with grayish 

 periostracum, translucent white shell, the aspect of Loripimis^ but 

 the external ligament of Lucina. This species is described in the 

 report on Porto Rico mollusks, prepared for the U. S. Fish Commission. 



Genus LORIPES Cuvier. 



Shell suborbicular with feeble sculpture, a narrow elongate lunule, 

 posterior dorsal area obscure or absent; ligament obsolete, resilium 

 separated from it, deeply innnersed, wholly internal; hinge with the 

 posterior laterals and right anterior cardinal absent, the anterior lat- 

 erals often obsolete; margins entire, anterior adductor scar long and 

 narrow. 



T3"pe, Avnphidesma lucinalls ljSimskrck= Tellina lactea of Poli and 

 others, l)utnotof Linuasus, Lncinaleucoma Turton, Z. (iiiiphhh'.sinoides 

 and lacteijides Deshayes, and L. elata Locard. Habitat, Mediterranean. 



The genus is Loripes Cuvier, 1817, not Schweigger, 1820; Thyati/ra 

 Gray, 1847, not of Hiibner, 1816; Ligida Menke, 1830, not of Mon- 

 tagu, 1803; Lucinida d'Orbiguy, 181:0, and Lucinidea Barrois (in Zittel), 

 1887. 



The American species are: 



? LORIPES CLAUSUS Philippi, 1848. 



Belize, British Honduras, Rev. W. A. Stanton. 



This species is solid, compressed, sharpl}' concentrically, and minutely 

 radiallv, striated; with a small but \evj distinct anterior dorsal area, 

 deep short lunule, and well-developed anterior lateral tooth. 



Lucina .sulcata Reeve, May, 1850, is externally very similar, from 

 the figure, but Reeve gives no data as to the hinge characters. L. clausus 

 is figured })y Philippi, 1850. Onl}^ one dead valve was received from 

 the collector. 



LORIPES CRYPTELLUS d'Orbigny, 1846. 



Pernambuco, Brazil. 



This species has a large dorsal anterior area, the hinge has the lat- 

 erals obsolete as in L. luc/'nah'-s Lamarck, and the surface concentric- 

 ally striate. As figured by d'Orbign}^ the valves are markedl}' unequal, 

 but this may have been an individual abnormality. It is much more 

 inflated than L. clausus. 



This species is called Luci?ia and Lucinida cryptella hy d'Orbigny 



