488 MANUAL OF THE MOLLUSCA. 
Leach, MS. Solecurtoides, Desm.) C.legumen, Pl. XXTI., 
Fig. 6. Shell narrow, sub-equilateral, anterior adductor impres- 
sions elongated, a second pedal scar near the pallial sinus. 
Animal with a long, truncated foot; siphons separate, diverg- 
ing, fringed. Distribution, 1 species. Britain, Mediterranean, 
Senegal, Red Sea. Fossil, 3 species. Pliocene—. Italy. 
Machera, Gould. (Siliqua, Megerle. Leguminaria, Schum.) 
M. polita, Pl. XXIT., Fig. 7. Shell smooth, oblong; epidermis 
polished; umbonal rib extending across the interior ef the 
valve ; pallial sinus short. The animal, figured by Middendorff, 
is similar to Solecurtus. Distribution, India, China, Ochotsk, 
Oregon, Sitka, Behring’s Sea, Newfoundland. I. costata, 
Say, is often obtained from the maw of the cod-fish. Fossil, 4 
species. Upper Greensand—. Britain, France. 
Pharella, Gray. Shell nearly cylindrical ; anterior muscular 
impression elongated. 
SoLEcurRTUws, Blainville. 
Hiymology, solen and, curtus, short. 
Synonyms, Psammosolen, Risso. Macha, Oken. Siliquaria, 
Schum. Tagelus, Gray. . 
Examples, 8. strigilatus, Pl. XXII., Fig. 8. §. Caribzeus, 
Pie ext. is. 9. 
Shell elongated, rather yentricose, with sub-central beaks ; 
margins sub-parallel; ends truncated, gaping; ligament promi- 
nent ; hinge-teeth 3 ; pallial sinus very deep, rounded ; posterior 
adductor rounded. 
Animal very large and thick, not entirely retractile within the 
shell; mantle closed below; pedal orifice and foot large; palpi 
triangular, narrow, lamellated inside; gills long and narrow, ~ 
outer much the shortest; siphons separate at the ends, united 
and forming a thick mass at their bases; anal orifices plain, 
branchial fringed. 
The Solecurti bury deeply in sand or mud, usually beyond 
low water, and are difficult to obtain alive. PP. Caribeus occurs 
in countless myriads in the bars of American rivers, and on the 
coast of New Jersey in sand exposed at low water; by removing 
three or four inches of sand its burrows may be discovered ; 
they are vertical cylindrical cavities, 14 inches in diameter and 
12 or more deep; the animal holds fast by the expanded end of 
its foot. 
Distribution, 25 species. United States, Britain, Mediterranean, 
West Africa, Madeira. 
F'o38i], 30 species. Neocomian—. United States, Hurope. 
