468 MANUAL OF THE MOLLUSCA. 



Animal (of C. solenoides) with mantle-lobes united, cirrattd 

 behind ; pedal opening moderate ; foot small, compressed, with 

 a large byssal pore near the heel ; siphons short, conical, unequal, 

 cirrated externally ; orifices fringed ; palpi small ; gills unequal, 

 the outer narrower and shorter, deeply lamellated, united 

 posteriorly, the inner prolonged between the palpi. 



Animal of Cypricardia rostrata, Lamarck, Philippines (Fig. 



300), with mantle-lobes united, 

 and covered with wrinkled epi- 

 dermis ; siphonal orifices fringed ; 

 gills deeply plicated, anterior 

 part of the outer gill united to 

 the inner ; dorsal border narrow, 

 plaited ; adductor muscles of two 



Fig. 261. Cypricardia, elements, 



Distrihution, 13 species. Eed Sea, India, and Australia. In 

 crevices of rock and coral. 



Fossil, 60 species. Lower Silurian — . North America and 

 Europe. 



? Sub-genera. Coralliophaga, Bl. C. coralliophaga, Lamarck. 

 Shell long, cylindrical, thin, slightly gaping behind ; hinge- 

 teeth 2.2, and a laminar posterior tooth ; pallial line with a wide 

 and shallow sinus. Distrihution, 5 species. MediteiTanean, in 

 the burrows of the Lithodomus ; sometimes two or three dead 

 shells are found one within the other, besides the original owner 

 of the cell ; South Sea. 



? Cypricardites, Conrad (part). An. Geol. Eep., 1841. (San~ 

 guinolites, M'Coy.) Employed for Cypricardia- shaped shells of 

 the palaeozoic rocks ; some of them are more nearly related to 

 Modiola (v. Modiolopsis, p. 422), but they bear no resemblance 

 lo Sanguinolaria. 



Goniophora, Phillips, 1848. Cypricardia cymbseformis, Sby. 

 "Upper Silurian, Britain [Mytilidoe ?). 



Pleurophorus, King, 1848. 



Tijije, P. costatus, Brown. Permian, England. (Pal. Trans., 

 1850. PI. XY., Pigs. 13—20.) 



Synonyms ? Cleidophorus, Hall (cast only). TJnionites, "Wissm. 

 ? Mseonia, Dana. 



Shell oblong ; dorsal area defined by a line, or keel ; umbones 

 anterior, depressed; hinge-teeth 2.2; laterals 1.1; elongated 

 posterior; anterior adductor impression deep, with a small pedal 

 scar close to it, and bounded posteriorly by a strong rib from the 

 hinge ; pallial line simple. 



